Aeca Xtender XTH 3000-12 User manual

Installation and Operating Instructions
Unit combining inverter, battery charger and transfer system.
Xtender
XTH 3000-12
XTH 5000-24
XTH 6000-48
XTH 8000-48
BTS-01 temperature sensor
723.932 | V 0.511
PHOTOVOLTAIK - PHOTOVOLTAIC - PHOTOVOLTAIQUE - FOTOVOLTAICA
EN

Steca Xtender
Installation and Operating Instructions 723.932 Xtender V0.511 Seite 2
TABLE OF CONTENTS
1INTRODUCTION................................................................................................................3
2GENERAL INFORMATION................................................................................................4
2.1 Operating instructions...................................................................................................4
2.2 Conventions..................................................................................................................4
2.3 Quality and warranty.................................................................................................... 5
2.4 Warnings and notes ......................................................................................................5
3ASSEMBLY AND INSTALLATION ...................................................................................6
3.1 Handling and moving ................................................................................................... 6
3.2 Storage..........................................................................................................................6
3.3 Unpacking..................................................................................................................... 7
3.4 Installation site..............................................................................................................7
3.5 Fastening.......................................................................................................................7
3.6 Connections.................................................................................................................. 8
4CABLING...........................................................................................................................9
4.1 Choice of system ........................................................................................................10
4.2 Earthing system ..........................................................................................................11
4.3 Recommendations for dimensioning the system........................................................ 12
4.4 Wiring diagrams .........................................................................................................12
4.5 Connecting the battery................................................................................................13
5ENERGISATION OF THE INSTALLATION.....................................................................17
6DESCRIPTION AND FUNCTIONING..............................................................................18
6.1 Circuit diagram...........................................................................................................18
6.2 Description of the main functions ..............................................................................18
6.3 Multi-unit configurations............................................................................................ 23
6.4 Accessories.................................................................................................................24
7CONTROL........................................................................................................................26
7.1 Main on/off control.....................................................................................................26
7.2 Display and control parts............................................................................................26
8MAINTENANCE OF THE INSTALLATION .....................................................................28
8.1 Product recycling........................................................................................................28
9EC DECLARATION OF CONFORMITY..........................................................................28
10 FIGURE COMMENT TABLES.........................................................................................29
11 FIGURE ELEMENT TABLES ..........................................................................................31
12 CONTROL AND DISPLAY PARTS FOR THE XTENDER (FIG. 4B)..............................34
13 TYPE PLATE ELEMENTS (FIG. 3B)...............................................................................34
14 TABLE OF STANDARD CONFIGURATIONS.................................................................35
15 TECHNICAL DATA..........................................................................................................37

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Installation and Operating Instructions 723.932 Xtender V0.511 Seite 3
1 Introduction
Congratulations! You are about to install and use a device from the Xtender range. You have
chosen a high-tech device that will play a central role in energy saving for your electrical
installation. The Xtender has been designed to work as an inverter / charger with advanced
functions, which can be used in a completely modular way and guarantee the faultless
functioning of your energy system.
When the Xtender is connected to a generator or network, the latter directly supplies the
consumers, and the Xtender works like a battery charger and backup device if necessary. The
powerful battery charger has an exceptional high output and form factor correction close to 1. It
guarantees excellent battery charging in all situations. The charge profile is freely configurable
according to the type of battery used or the method of usage. The charge voltage is corrected
depending on the temperature, thanks to the optional external sensor. The power of the charger
is modulated in real time dependent according to the demand of the equipment connected at the
Xtender output and the power of the energy source (network or generator). It can even
temporarily backup the source if the consumer demand exceeds the source capacity.
The Xtender continuously monitors the source to which it is connected (network or generator) and
disconnects itself immediately if the source is missing, disturbed or does not correspond to the
quality criteria (voltage, frequency, etc.). It will then function in independent mode, thanks to the
integrated inverter. This inverter, which has an extremely robust design, benefits from Steca’s
many years of experience and expertise in this area. It is capable of supplying any type of load
without faults, enjoying reserves of additional power that is unmatched on the market. All your
equipment will be perfectly provided with energy and protected from power outages in systems
where energy supply is unpredictable (unreliable network) or voluntarily limited or interrupted,
such as hybrid installations on remote sites or mobile installations.
The parallel and/or three-phase network operation of the Xtender offers modularity and flexibility
and enables optimum adaptation of your system to your energy requirements.
The RCC-02/03 control, display and programming centre (optional) enables optimum
configuration of the system and guarantees the operator continuous control for all important
configurations in the installation.
In order to guarantee perfect commissioning and functioning of your installation, please read this
manual carefully. It contains all the necessary information relating to the functioning of the
inverters / chargers in the Xtender series. The setting up of such a system requires special
expertise and may only be carried out by qualified personnel familiar with the applicable local
regulations.

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Installation and Operating Instructions 723.932 Xtender V0.511 Seite 4
2 General information
2.1 Operating instructions
This manual is an integral part of each inverter/charger from the Xtender series.
It covers the following models and accessories:
Xtender: XTH 3000-12 – XTH 5000-24 – XTH 6000-48 – XTH 8000-48
Temperature sensor: BTS-01
For greater clarity, the device is referred to in this manual as Xtender, unit or device, when the
description of its functioning applies indiscriminately to different Xtender models.
Thes operating instructions serve as a guideline for the safe and efficient usage of the Xtender.
Anyone who installs or uses an Xtender can rely completely on this operating instructionsl, and is
bound to observe all the safety instructions and indications contained. The installation and
commissioning of the Xtender must be entrusted to a qualified professional. The installation and
usage must conform to the local safety instructions and applicable standards in the country
concerned.
2.2 Conventions
This symbol is used to indicate the presence of a dangerous voltage that is sufficient to
constitute a risk of electric shock.
This symbol is used to indicate a risk of material damage.
This symbol is used to indicate information that is important or which serves to optimise
your system.
All values mentioned hereafter, followed by a configuration no. indicate that this value may be
modified with the help of the RCC-02/03 remote control.
In general, the default values are not mentioned and are replaced by a configuration no. in the
following format: {xxxx}. The default values for this configuration are specified in the configuration
table, p.35.
All configuration values modified by the operator or installer must be transferred into the same
table. If a parameter not appearing in the list (advanced configurations) has been modified by an
authorised person with technical knowledge, they will indicate the number of the modified
parameter(s), the specifications of the configuration(s) and the new value set, at the end of the
same table.
All figures and letters indicated in brackets refer to items of figures in the separate manual
“Appendix to the installation and operating instructions” supplied with the device.
The figures in brackets refer to elements belonging to the Xtender.
The uppercase letters in brackets refer to AC cabling elements.
The lowercase letters in brackets refer to battery cabling elements.

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Installation and Operating Instructions 723.932 Xtender V0.511 Seite 5
2.3 Quality and warranty
During the production and assembly of the Xtender, each unit undergoes several checks and
tests. These are carried out with strict adherence to the established procedures. Each Xtender
has a serial number allowing complete follow-up on the checks, according to the particular data
for each device. For this reason it is very important never to remove the type plate (appendix I –
fig. 3b) which shows the serial number. The warranty for this equipment depends upon the strict
application of the instructions appearing in this manual.
The warranty period for the Xtender is 2 years.
2.3.1 EXCLUSION OF WARRANTY
No warranty claims will be accepted for damage resulting from handling, usage or processing that
does not explicitly appear in this manual. Cases of damage arising from the following causes are
notably excluded from the warranty:
•Surge voltage on the battery input (for example, 48 V on the battery input of an XTH
3000-12)
•Incorrect polarity of the battery
•The accidental ingress of liquids into the device or oxidation resulting from condensation
•Damage resulting from falls or mechanical shocks
•Modifications carried out without the explicit authorisation of Steca
•Nuts or screws that have not been tightened sufficiently during the installation or
maintenance
•Damage due to atmospheric surge voltage (lightning)
•Damage due to inappropriate transportation or packaging
•Disappearance of original marking elements
2.3.2 EXCLUSION OF LIABILITY
The placement, commissioning, use, maintenance and servicing of the Xtender cannot be the
subject of monitoring by Steca. For this reasons we assume no responsibility and liability for
damage, costs or losses resulting from an installation that does not conform to the instructions,
defective functioning or deficient maintenance. The use of an inverter is the responsibility of the
customer in all cases.
This equipment is neither designed nor guaranteed to supply installations used for vital medical
care nor any other critical installation carrying significant potential damage risks to people or the
environment.
We assume no responsibility for the infringement of patent rights or other rights of third parties
that result from using the inverter.
Steca reserves the right to make any modifications to the product without prior notification.
2.4 Warnings and notes
2.4.1 GENERAL
This manual is an integral part of the device and must be kept available for the operator
and installer. It must remain close to the installation so that it may be consulted at any
time.
The configuration table available at the end of the manual must be kept up to date in the event of
modification of the configurations by the operator or installer. The person in charge of installation
and commissioning must be wholly familiar with the precautionary measures and the local
applicable regulations.
When the Xtender is running, it generates voltage that can be potentially lethal. Work on
or close to the installation must only be carried out by thoroughly trained and qualified
personnel. Do not attempt to carry out ongoing maintenance of this product yourself.
The Xtender or the generator connected to it, may start up automatically under certain
predetermined conditions.
When working on the electrical installation, it is important to be certain that the source of

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Installation and Operating Instructions 723.932 Xtender V0.511 Seite 6
DC voltage coming from the battery as well as the source of AC voltage coming from a
generator or network have been disconnected from the electrical installation.
Even when the Xtender has been disconnected from the supply sources (AC and DC), a
dangerous voltage may remain at the outputs. To eliminate this risk you must switch the
Xtender OFF using the ON/OFF button (1). After 10 seconds the electronics is
discharged and intervention may take place without any danger.
All elements connected to the Xtender must comply with the applicable laws and regulations.
Persons not holding written authorisation from Steca are not permitted to proceed with any
change, modification or repairs that may be required. Only original parts may be used for
authorised modifications or replacements.
This manual contains important safety information. Read the safety and working instructions
carefully before using the Xtender. Adhere to all the warnings given on the device as well as in
the manual, by following all the instructions with regard to operation and use.
The Xtender is only designed for interior use and must under no circumstances be subjected to
rain, snow or other humid or dusty conditions.
The maximum specifications of the device shown on the type plate, as at fig. 3b, must be
adhered to.
In the event of use in motorised vehicles, the Xtender must be protected from dust, splash water
and any other humid condition. It must also be protected from vibration by installing absorbent
parts.
2.4.2 PRECAUTIONS FOR USING THE BATTERIES
Lead-acid or gel batteries produce a highly explosive gas with normal use. No source of sparks or
fire should be present in the immediate vicinity of the batteries. The batteries must be kept in a
well-ventilated place and be installed in such a way as to avoid accidental short-circuits when
connecting.
Never try to charge frozen batteries.
When working with the batteries, a second person must be present in order to lend assistance in
the event of problems.
Sufficient fresh water and soap must be kept to hand to allow adequate and immediate washing
of the skin or eyes affected by accidental contact with the acid.
In the event of accidental contact of the eyes with acid, they must be washed carefully with cold
water for 15 minutes. Then immediately consult a doctor.
Battery acid can be neutralised with baking soda. A sufficient quantity of baking soda must be
available for this purpose.
Particular care is required when working close to the batteries with metal tools. Tools such as
screwdrivers, open-ended spanners, etc. may cause short-circuits. Consequently occurring
sparks may cause the battery to explode.
When working with the batteries, all metal jewellery such as rings, bracelet watches, earrings,
etc., must be taken off. The current output by the batteries during a short-circuit is sufficiently
powerful to melt the metal and cause severe burns.
In all cases, the instructions of the battery manufacturer must be followed carefully.
3 Assembly and installation
3.1 Handling and moving
The weight of the Xtender is between 35 and 50kg depending upon the model. Use an
appropriate lifting method as well as help from a third party when installing the equipment.
3.2 Storage
The equipment must be stored in a dry environment at an ambient temperature of between
-20°C and 60°C. It stay in the location where it is to be used a minimum of 24 hours before being
set up.

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Installation and Operating Instructions 723.932 Xtender V0.511 Seite 7
3.3 Unpacking
When unpacking, check that the equipment has not been damaged during transportation and that
all accessories listed below are present. Any fault must be indicated immediately to the product
distributor or the contact given at the back of this manual.
Check the packaging and the Xtender carefully.
Standard accessories:
Installation and operating instructions, c.f. Appendix 1
Mounting plate – fig. 2a (18)
2 conduit glands for the battery cable
3.4 Installation site
The installation site for the Xtender is of particular importance and must satisfy the following
criteria:
Protection from any unauthorised person.
Protection from water and dust and in a place with no condensation.
It must not be situated directly above the battery or in a cabinet with it.
No easily inflammable material should be placed directly underneath or close to the Xtender.
Ventilation apertures must always remain clear and be at least 15cm from any obstacle that may
affect the ventilation of the equipment according to fig. 2b.
In mobile applications it is important to select an installation site that ensures as low a vibration
level as possible.
3.5 Fastening
The Xtender is a heavy unit and must be mounted to a wall designed to bear such a
load. A simple wooden panel is insufficient.
The Xtender must be installed vertically with sufficient space around it to guarantee adequate
ventilation of the device (see figs. 2a and 2b).
If the Xtender is installed in a closed cabinet this must have sufficient ventilation to guarantee an
ambient temperature that conforms to the operation of the Xtender.
Firstly, fit the mounting bracket (18) supplied with the device, using 2 Ø <6-8 mm> screws**.
Then hang the Xtender on the bracket. Fasten the unit permanently using 2 Ø <6-8 mm>
screws** on to the two notches located at the underside of the case.
**: These items are not delivered with the device.
It is imperative to ensure complete and safe fastening of the device. A device that is
simply hung may detach and cause severe damage.
In motor vehicles or when the support may be subject to strong vibrations, the Xtender must be
mounted on anti-vibration supports.

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Installation and Operating Instructions 723.932 Xtender V0.511 Seite 8
3.6 Connections
3.6.1 GENERAL RECOMMENDATIONS
The Xtender falls within protection class I (has a PE connection terminal). It is vital that a
protective earth is connected to the AC IN and/or AC OUT PE terminals. An additional protective
earth is located between the two fastening screws at the bottom of the unit (fig. 2b-(17)).
In all cases, the PE conductor for the equipment must at least be connected to the PE
for all equipment in protection class I upstream and downstream of the Xtender
(equipotential bonding). It is imperative that the legislation in force for the application
concerned be adhered to.
Tighten of the input (13) and output (14) terminals by means of a no. 3 screwdriver and those for
the “REMOTE ON/OFF” (7) and “AUX.CONTAC” (8) by means of a no. 1 screwdriver.
The cable sections of these terminals must conform to local regulations.
All connection cables as well as the battery cables must be mounted using cable restraints in
order to avoid any traction on the connection.
Battery cables must also be as short as possible and the section must conform with the
applicable regulations and standards. Sufficiently tighten the clamps on the “battery” inputs (fig.
4a (11) and (12)).
3.6.2 DEVICE CONNECTION COMPARTMENT
The unit’s connection compartment must remain permanently closed when in operation.
It is imperative to close the protection cap on the connection terminals after each
intervention in the device.
After opening, check that all sources of AC and DC voltage (batteries) have been
disconnected or put out of service.
Fig. 4a
AUXILLARY
CONTACT
L1
L2
L3
AUX1
AUX2
ACOutput
ACInputL
L
ON Open
Terminated
OFF
Temp.
Sens.
1
1
2
A
B
123
23
56
78
9
10
11 12
4
Main
switch
13 14
!
Warning!
Check battery polarity (+/-) before connecting
A wrong connexion may damage the systen

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Installation and Operating Instructions 723.932 Xtender V0.511 Seite 9
Pos. Denominati
on Description Comment
1 ON/OFF
Main switch Main on/off switch See chapter Automatic load shedding of the inverter (2 sequences)
7.1 – p 26.
2 Temp. Sens Connector for the battery
temperature sensor See chapter 6.2.11 – p. 23. Only connect the original Steca BTS-01
sensor
3 Com. Bus Double connector for
connecting peripherals such as
the RCC002/03 or other
Xtender units
4 O / T
(Open /
Terminated)
Switch for terminating the
communication bus.
See chapter 4.5.8 – p. 16.
The two termination switches (4) for the
communication bus both remain in
position T (terminated) except when both
connectors are in use.
5 -- 3.3 V (CR-2032) lithium ion
type battery socket Used as a permanent supply for the internal clock. See chapter 6.2.10 – p 23.
6 -- Jumper for programming the
off/on switch by dry contact See chapter 6.2.11 – p. 23 and fig. 8b point (6) and (7). They are positioned at
A-1/2 and B-2/3 by default
7 REMOTE
ON/OFF Connection terminals for dry on/off remote connection. See chapter 6.2.11 – p. 23). When the control via dry contact is not
being used, a bridge must be present
between the two terminals.
8 AUXILIARY
CONTACT Auxiliary contact See chapter 6.2.9 – p. 23 Take care not to exceed the admissible
loads
9 -- Activation indicators for
auxiliary contacts 1 and 2 See chapter 6.2.9 – p. 23
10 L1/L2/L3 Phase selection jumpers. See chapter 6.3.1. – p. 24.
Jumper default at position L1
11 +BAT Positive pole battery
connection terminals
12 -BAT Negative pole battery
connection terminals
Carefully read chapter 4.5 – p. 12
Take care with the polarity of the battery
and when tightening the clamp.
13 AC Input Connection terminals for the
alternative power supply
(generator or public network)
See chapter 0- p. 16.
Note: It is imperative that the PE terminal
be connected.
14 AC Output Connection terminals for the
device output. See chapter 4.5.5 - p. 16. Note: Increased voltages may appear on
the terminals, even in the absence of
voltage at the input of the inverter.
4 Cabling
The connection of the Xtender inverter / charger is an important installation step.
It may only be carried out by qualified personnel and in accordance with the applicable local
regulations and standards. The installation must always comply with these standards.
Pay attention that connections are completely tightened and that each wire is connected at the
right place.

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Installation and Operating Instructions 723.932 Xtender V0.511 Seite 10
4.1 Choice of system
The Xtender may be used in different system types, each of which must meet the standards and
particular requirements associated with the application or site of installation. Only an
appropriately qualified installer can advise you effectively on the applicable standards with regard
to the various systems and the country concerned.
Examples of cabling are presented in appendix I of this manual, fig. 5 and following. Please
carefully read the notes associated with these examples in the tables on p. 29 and following.
4.1.1 HYBRID TYPE STAND-ALONE SYSTEMS
The Xtender can be used as a primary supply system for grid-remote sites where a renewable
energy source (solar or hydraulic) is generally available and a generator is used as backup. In
this case, batteries are generally recharged by a supply source such as solar modules, wind
power or small hydropower systems. These supply sources must have their own voltage and/or
current regulation system and are connected directly to the battery. (Example, fig. 11)
When the energy supply is insufficient, a generator is used as a back-up energy source. This
allows the batteries to be recharged and direct supply to consumers via the Xtender transfer relay.
When the input voltage source is a low power generator (lower than the power) the
factory settings (adapted to grid-connection) must be modified according to the
“generator” column in the configuration table on p. 35.
4.1.2 GRID-CONNECTED EMERGENCY SYSTEMS
The Xtender can be used as an emergency system, also known as an uninterruptible power
supply (UPS) – enabling a reliable supply to a site connected to an unreliable network. In the
event of an interruption to the energy supply from the public network, the Xtender, connected to a
battery, substitutes the faulty source and enables a support supply to the users connected
downstream. These will be supplied as long as the energy stored in the battery allows. The
battery will quickly be recharged at the next reconnection to the public grid.
Various application examples are described in figs. 8a – 8c in appendix I.
The use of the Xtender as a UPS must be carried out by qualified personnel who have
been checked by the responsible local authorities. The diagrams in the appendix are
given for information and as a supplement. The applicable local standards and
regulations must be adhered to.
4.1.3 INTEGRATED MOBILE SYSTEMS
These systems are meant to be temporarily connected to the grid and ensure the supply of the
mobile system when this is disconnected from the grid. The main applications are for boats,
service vehicles and leisure vehicles. In these cases, two separate AC inputs are often required,
one connected to the grid and the other connected to an on-board generator. Switching between
two sources must be carried out using an automatic or manual reversing switch, conforming to
the applicable local regulations. The Xtender has a single AC input.
Various application examples are described in figs. 10a – 10b – 10c).
4.1.4 MULTI-UNIT SYSTEMS
Whatever system is selected, it is perfectly possible to realise systems composed of several units
of the same type and the same power output. Up to three Xtenders in parallel or three extenders
forming a three-phase grid or three times two with three Xtenders in parallel forming a three-
phase / parallel grid, may be thus combined.

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4.2 Earthing system
The Xtender is a protection class I unit, which is intended for cabling in a grid type TT, TN-S or
TNC-S. The earthing of the neutral conductor (E) is carried out at a sole installation point,
upstream of the RCD circuit breaker (D).
The Xtender can be operated with any earthing system. In all cases it is imperative that the
protective earth be connected in compliance with the applicable standards and regulations. The
information, notes, recommendations and diagram mentioned in this manual are subject to local
installation regulations in every case. The installer is responsible for the conformity of the
installation with the applicable local standards.
4.2.1 MOBILE INSTALLATION OR INSTALLATION CONNECTED TO THE GRID VIA PLUG CONNECTOR
When the input of the device is connected directly to the grid via a plug, the length of the cable
must not exceed 2 m and the plug must remain accessible.
In the absence of voltage at the input, the neutral and live are interrupted, thereby guaranteeing
complete isolation and protection of the cabling upstream of the Xtender.
The earthing system downstream of the Xtender is determined by the upstream earthing system
when the grid is present. In the absence of the grid, the earthing system downstream of the
inverter is in isolated mode. The safety of the installation is guaranteed by the equipotential
bonding.
The connection (link) between the neutrals (C) upstream and downstream of the
Xtender is not permitted in this configuration.
This connection type guarantees the optimal continuity for supplying the Xtender loads. The first
isolation fault will not lead to an interruption in the supply.
If the installation requires the use of a permanent isolation controller this would have to be de-
activated when the TT network is present at the Xtender input.
A
ll sockets and protection class I devices connected downstream of the Xtender must
be properly connected to the earth (earthed socket). The cabling rules above remain
valid, including fixed installations, in all cases where the Xtender input is connected to
the grid via a plug connector.
4.2.2 FIXED INSTALLATION
The installation may be equivalent to a mobile installation (with interrupted neutral).
In a fixed installation where the neutral is connected to the earth at a single installation point
upstream of the Xtender, it is permissible to carry out a connection of the neutrals in order to
preserve an unchanged earthing system downstream, independent of the operating mode of the
Xtender. This choice has the advantage of keeping the protection devices downstream of the
Xtender. This connection can be executed according to the examples in appendix 1, or carried
out by modifying the configuration {1486}
In this case the appearance of the first fault will lead to the installation stopping or the
disconnection of the protection devices upstream and/or downstream of the Xtender.
Safety is guaranteed by the equipotential bonding and by any RCD circuit-breakers placed
downstream.
This connection (C) is not permitted if a socket is installed upstream of the Xtender.
4.2.3 INSTALLATION WITH AUTOMATIC PE-NEUTRAL SWITCHING
In certain applications, it is desirable to keep the neutral upstream and downstream of the
Xtender separated (C) while reestablishing the earthing system (TN-S, TT or TNC-S) in the
absence of voltage at the input. This can be programmed by the configuration {1485} via the
RCC-02/03 remote control. This modification must be carried out possessing technical knowledge,
at the responsibility of the installer and in conformity with the applicable regulations and
standards.
This allows adherence to the requirements for an earth-neutral connection at the source.

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4.3 Recommendations for dimensioning the system
4.3.1 DIMENSIONING THE BATTERY
The battery capacity is dimensioned according to the requirements of the user – that is 5 to 10
times its average daily consumption. The discharge depth of the battery will therefore be limited
and the service life of the battery will be extended.
On the other hand, the Xtender must have a battery capacity that is large enough to be able to
take full advantage of the performance of the equipment. The minimum capacity of the batteries
(expressed in Ah) is generally dimensioned in the following way: five times the rated power
output of the Xtender / the battery voltage. For example, the model XTH 8000-48 must have a
battery of a minimum capacity of 7000*5/48=730 Ah (C 10). Because of the inverter’s extreme
overload capacity, it is often recommended that this value be rounded up. An under-dimensioned
battery may lead to an accidental and undesired stopping of the Xtender in the event of high
instances of use. This stoppage will be due to a voltage that is insufficient for the battery, subject
to a strong discharge current.
The battery will be selected with regard to the greatest value resulting from the calculations set
out above.
The battery capacity determines the adjustment of the configuration {1137} “battery charge
current”. A value between 0.1 and 0.2 x C batt. [Ah] (C10) enables an optimum charge to be
guaranteed.
The method proposed below is strictly indicative and in no way constitutes a guarantee
of perfect dimensioning. The installer is solely responsible for good dimensioning and
installation
4.3.2 DIMENSIONING THE INVERTER
The inverter is dimensioned in such a way that the rated power output covers the power of all the
consumers which will be used at the same time. A dimensioning margin of 20 to 30% is
recommended to guarantee that the Xtender will work well in an ambient temperature of more
than 25 °C.
4.3.3 DIMENSIONING THE GENERATOR
The power output of the generator must be the same or more than the average daily power.
Optimally, it should be two or three times this power. Thanks to the smart boost function it is not
necessary to over-dimension the generator. Indeed, the loads that are temporarily higher than the
power of the generator will be supplied by the inverter. Ideally it should not have a power output
by phase that is less than half of the power of the Xtender(s) present at this phase.
The power available downstream of the inverter when the generator is working is the
same as the sum of the two powers.
4.3.4 DIMENSIONING THE ALTERNATIVE ENERGY SOURCES
In a hybrid system, the alternative energy sources such as the solar generator, wind power and
small hydropower should, in principle, be dimensioned in such a way as to be able to cover the
average daily consumption.
4.4 Wiring diagrams
The diagrams shown in the appendix of this document are subsidiary. The applicable local
installation regulations and standards must be adhered to.
The elements referred to with an uppercase letter denote the alternate current (AC) part.
The elements referred to with a lowercase letter denote the direct current (DC) part.

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4.5 Connecting the battery
Lead batteries are usually available in 2 V, 6 V or 12 V block types. In the majority of cases, in
order to obtain an operating voltage that is correct for Xtender usage, several batteries must be
connected in series or in parallel depending on the circumstances.
. In multi-unit systems, all Xtenders from the same system must be connected according
to the same battery bank.
The various cabling options are presented in figures 5a-5b (12 V), 5c-5e (24 V) and 6a to 6d (48
V) in appendix I of this manual.
4.5.1 CONNECTING THE BATTERY (XTENDER SIDE)
Insert the conduit glands supplied on the battery
cable before tightening the cable clamp. Crimp the
cable clamps and fasten the conduit gland on the
device. Repeat this for the second battery cable.
20
23
24
22
21
26
25
Connect the red cable (+) to the “+ battery” terminal,
and the black cable (-) to the "- battery” terminal of
the device, adhering to the order of the elements
shown in figure 1b on the side.
Unit
Fuse
XTH-2500-12
None
XTH-5000-24
300 A
XTH-6000-48
200 A
XTH-8000-48
300 A
4.5.2 INTERNAL FUSE FOR THE XTENDER
The internal fuse provides additional protection on certain models and does not preclude the
requirement for cable protection closest to the battery. (see chapter following).
The battery clamp fitted on the fuse (24) must have a diameter of M10 in order to
match the centering lip of the ceramic isolation disc (23).
The internal fuse of the equipment (26) is always installed on the positive terminal (+). It
will be fitted on the negative terminal in the event of connection of the + to the earth.

Steca Xtender
Installation and Operating Instructions 723.932 Xtender V0.511 Seite 14
4.5.3 BATTERY-SIDE CONNECTION
Before connecting the battery, carefully check the voltage and polarity of the battery
using a voltmeter.
Incorrect polarity or surge voltage may seriously damage the device.
Prepare the batteries for connection: appropriate battery clamps, protection device (f), cable in
good conditions with correctly fitted clamps.
Fasten the black cable on to the negative pole (-) of the battery and the red cable on the open
protection device (f).
The battery cables must be protected by one of the following measures in all cases:
- protection device (fuse) at each pole
- protection device (fuse) on the pole connected to the earth
- mechanical envelope making an accidental short-circuit impossible.
When connecting the battery, a spark may occur when connecting the second pole. This
spark is due to the load of the internal filtering capacity of the Xtender.
When connecting the battery it is necessary to check that the configuration values of the Xtender
conform to the recommendations of the battery manufacturer. Non-conforming values may be
dangerous and/or seriously damage the batteries. The default values of the battery’s charge
threshold limits are shown in fig. 3a and specified in the configuration tables. If they prove not to
conform, it is necessary to modify them via the RCC 02/03 remote control before connecting the
voltage sources on the AC input. Steca is not responsible for default values not corresponding
with the recommendations of the manufacturer.
If the factory settings are modified, the new values must be entered on the configuration table on
p. 35 of this manual. The default values proposed by Steca are the usual values for gel batteries
(VRLA or AGM).
The calibre of the protection device (f) must be adapted to the cable section and also mounted as
close as possible to the battery.
BATTERY CABLE SECTION (minimum recommended):
XTH3000-12 XTH5000-24 XTH6000-48 XTH8000-48
90 mm290 mm250 mm270 mm2
The cable sections recommended above are valid for lengths less than 3 m. Beyond this length it
is strongly recommended to over-section the battery cables.
The battery cables must also be as short as possible.
It is always preferable to keep the cable at the negative pole of the battery as short as possible.
The clamps must be carefully fixed and tightened sufficiently to guarantee minimum
loss. Insufficient tightening may cause dangerous heating at the connection point.
For safety reasons, we recommend an annual check on the tightness of all connections.
For mobile installation the connections should be checked more frequently for tightness.
The cabling and connection of the installation should only be carried out by an appropriately
qualified professional. The installation material such as cables, connectors, distribution boxes,
fuses, etc. must be adapted and must conform to the applicable laws and regulations the
application under consideration.

Steca Xtender
Installation and Operating Instructions 723.932 Xtender V0.511 Seite 15
4.5.4 EARTHING THE BATTERY
One of the two battery conductors can be earthed. This may be either the positive or negative
pole. In all cases the installation must conform to the local regulations and usage or specific
standards associated with the application.
In case of earthing, the earthing conductor section must at least be equivalent to the section of
the battery conductor. The earthing of the equipment must also adhere to these regulations. In
this case the use of the additional earthing screw is recommended (fig. 2b (17)), which is located
at the front of the device between the two lower fastening screws.
4.5.5 CONNECTING THE CONSUMERS AT THE 230 VAC OUTPUT
High voltages may be present on the connection terminals (13) and (14). Make sure that
the inverter is deactivated and that there is no AC or DC voltage present on the AC IN
terminals and battery terminals, before proceeding with the connection.
The 230 V consumers must be connected on the “AC OUT” (14) connection terminals with the
wire section conforming to the standards with regard to the rated current at the Xtender output
(see fig. 1a). Distribution must conform to the local standards and regulations, and generally, be
realised via a distribution table.
The Xtender terminals are marked in the following way:
N = neutral, L = live = protective earth (connected to the case of the device).
Due to the source backup function (smart boost) the current at the output of the device
may be higher than the rated current of the inverter. It is the sum of the current supplied
by the additional source and the current supplied by the inverter. In this case, the
dimensioning of the output cables will be carried out by adding the current indicated on
the protection device (H) located on the upstream of the unit, to the nominal current of
the inverter. (See fig. 1a and chap. 6.2.7 – p. 21)
If the backup function at the source (smart boost) is not used, the calibre of the protection device
for the output (F) will be established at a maximum value equal to the rated current of the inverter,
or at the maximum value of the protection device at the input (H) if this is exceeds the rated
current of the inverter.
An additional earthing terminal (15) is present between the two fastening screws at the
bottom of the unit. It can be used instead of a connection on the input terminals of the
device, particularly when cable sections are used at the output that do not allow use of a
three-wire cable (live earth and neutral) through the conduit glands of the connection
cables of the input and output (AC IN and AC OUT), where when the earthing of one of
the points of the battery requires a cable section greater than the the PE conductor
section of the AC IN and/or AC OUT line.

Steca Xtender
Installation and Operating Instructions 723.932 Xtender V0.511 Seite 16
4.5.6 CONNECTING THE AC SUPPLY SOURCES
The Xtender is intended to be supplied by alternative voltage sources such as the public grid or a
generator. Check that the rated voltage of the source corresponds to the rated voltage (34) of the
Xtender specified on the type plate (fig. 3b).
The source must be connected to the input terminals marked “AC INPUT” (13) with sufficient wire
section, depending on the power output of the source, and protected by a protection device of the
appropriate calibre. This will be at the maximum equal to the current I AC in max (35) specified
on the type plate (fig. 3b).
The terminals are marked in the following way: N = neutral, L = live, PE = protective earth
(connected to the case of the device).
4.5.7 WIRING AUXILIARY CONTACTS
These contacts are reversing contacts that are potential-free. The admissible currents and
voltages for these contacts are 16 A / 250 V AC or 3 A/50 V DC max. The representation of the
contact near the terminals corresponds to the status of the contact in idle mode (light indicator (5)
off). The cabling of these auxiliary contracts depends solely on the application and cannot be
described in this manual.
The factory-set functions for these 2 auxiliary contacts are covered in the chapter 0– p. .
4.5.8 CONNECTING THE COMMUNICATIONS CABLES
The Xtender is equipped with a pair of RJ45/8 connectors that allow information transfer via a
communication bus for different consumer types which have the proprietary protocol of Steca. In
this network all parties in the network are connected in series (chain).
The length of the communication bus cable must not exceed 300 m.
In a system comprising a single Xtender, the connection of the RCC-02 or RCC-03 may be
conducted without stopping the Xtender (warm).
The communication bus will be used to interconnect other Xtender inverters in the case of a
multi-unit application or to connect other types of users who have the proprietary protocol of
Steca. In these cases, the installation must be switched off using the main “ON/OFF” button (1) to
connect the units via the communication bus.
The 2 switches for terminating the communication bus, “Com. Bus" (4) both remain in
position T (terminated) except when both connectors are in use. In this case, and only in
this case, both must be placed in the O open position. If one of the two connectors is not
in use, the two termination switches (14) will be in position T.
4.5.9 CONNECTING THE TEMPERATURE SENSOR (BTS-01)
The temperature sensor, BTS-01 is supplied with a 3 m cable fitted with RJ11/6-type plugs. It
may be connected or disconnected at any time (including when the device is in use) using the
corresponding socket (2) marked “temp. sens.” on the Xtender. Plug the connectors into the
socket (2) until they click in. The temperature sensor sleeve may simply be glued onto the battery
or directly next to it. The temperature sensor will be recognised automatically and the correction
made immediately.

Steca Xtender
Installation and Operating Instructions 723.932 Xtender V0.511 Seite 17
5 Energisation of the installation
It is imperative that the closing cap for the connection compartment be installed and
screwed tight before the installation is energised. There are dangerous voltages within
the interior of the connection compartment.
The connection of the Xtender must be carried out in the order given below. Any disassembly
must be carried out in the reverse order.
1. Connecting the battery
Too high or inappropriate a battery voltage may seriously damage the Xtender. For
example, installing a 24 V battery in the Xtender 3000-12.
If the Xtender has been connected the wrong way around by accident (incorrect polarity
of the battery) it is highly likely that the protection fuse inside the equipment may melt
and will have to be replaced. If such is the case, it will be necessary to disconnect all the
connections to the Xtender including the battery. If, after replacing the fuse, the Xtender
proves not to work correctly after reconnecting the battery with the correct polarity, it will
have to be returned to your distributor for repair.
2. Putting the Xtender(s) in operation using the main ON/OFF switch (1). The Xtender is
supplied and is ready for operation. If you require immediate start-up of the inverter when
the battery is energised, the main switch (1) must be in the “ON” position and the
configuration {1111} activated.
3. Connecting the consumers at the output: Activate the output protection device (F) if
existing, and/or press the ON/OFF button (41). The light indicator “AC out” (46) lights up
or flashes (in the event of an absence of consumers).
4. Activating the input circuit breaker(s) If an AC source (generator or network) valid in
frequency and voltage is present at the AC input, the device automatically goes into
transfer and will start to charge the batteries. The consumers at the output are therefore
supplied directly by the power source present at the input.
Your installation is now in operation. If particular configuration or adjustment is required by the
system, it is recommended to carry this out immediately. Adjustments must be made with the
help of the RCC-02/03 remote control. Please refer to the operating instructions for this
accessory.

Steca Xtender
Installation and Operating Instructions 723.932 Xtender V0.511 Seite 18
6 Description and functioning
The Xtender is a sine wave inverter with a battery charger. It has been developed for use as a
standalone installation to supply AC voltage (not connected to the grid) or as a continuous supply.
6.1 Circuit diagram
RJ45
AC IN
Temp.
AC OUT
RJ11
CAN bus
ON
Charge
AC out
AC in
1x
1x
1x
2x
1x
Battery low1x
2x
3x
4x
Swiss Made
10nF 10nF
2,2nF
100nF
8p
8p Bus termination
6p
T
ORemote
On/Off
DCAC
Aux2Aux1
2,2nF 2,2nF
2,2nF
K1
K2
K3 K4
10
9
14
13
12
247
6
3
17
a
f
BTS-01
e
f
t
6.2 Description of the main functions
6.2.1 INVERTER
The Xtender is equipped with a high-performance inverter which supplies a perfect and very
precise sine wave. Any unit designed for the 230 V/50 Hz public grid may connect to it without
any problem, up to the rated power out of your Xtender. The inverter is protected against
overloads and short-circuits.
Thanks to the largely over-dimensioned performance level, loads of up to three times greater
than the Xtender’s rated output can be faultlessly supplied for short periods of use, thus allowing
motors to be started up without any problem.
When the Xtender is operating the LED “ON” (43) is glowing.
When the Xtender is in inverter mode, the LED “AC out” (46) is glowing. If it flashes, the inverter
is in “load search” mode (see following chapter “Automatic load detection”).
6.2.2 AUTOMATIC LOAD DETECTION
In order to save battery energy, the Xtender inverter stops and automatically goes into load
search when the detected load is lower than the sensitivity set by the configuration {1187}. It
automatically goes back into operation when a power consumer greater than this value demands
it. The indicator (46) flashes if the inverter is in “load search” mode, which also indicates that the
AC voltage is present at the output in an intermittent form.
In standby mode the system will thus consume minimal power from the battery (see table of

Steca Xtender
Installation and Operating Instructions 723.932 Xtender V0.511 Seite 19
technical data p. 37). The detection threshold for the absence of loads can be adjusted according
to the configuration range {1187} by means of the RCC-02/03 remote control. When the
configuration is set to 0 the inverter will still operate even in the absence of any consumer.
6.2.3 TRANSFER RELAY
The Xtender can be connected to an alternative power source such as a generator or public
network. When the voltage at the entry satisfies the voltage {1199+470} and frequency {1505-
1506} parameters, the transfer relay will be activated, except where the input current limit{1107}
is lower than the instantaneous current supplied by the Xtender inverter. If the limit has not been
exceeded then the voltage present at the input of the Xtender is therefore available at the output
for the consumers connected. At the same time the battery charger goes into operation. The
sharing of energy between consumers and the battery charger is adjusted automatically (see
chap. 6.2.6 – p. 21). The transfer relay will be deactivated when the input voltage no longer
satisfies the configuration {1199} or {1432} min. and max. voltage and frequency at the input or
when the current limit {1107} is exceeded, if the exceeding of this limit is prohibited {1436} It then
passes immediately into inverter mode. In this case the loads are supplied exclusively by the
battery via the inverter (see chap. 6.2.7 – p. 21).
A delay before the opening of the transfer relay can be adjusted {1198}.
This switching always takes place automatically. The switching always takes place without delay
by default (UPS mode) and the equipment will pass into inverter mode once the voltage and
frequency criteria at the input are no longer being fulfilled. The presence of increased dynamic
loads (such as pneumatic angle grinders, etc.) may lead to an undesirable opening of the transfer
relay due to the weakness of the source. In this case a delay in the opening of the transfer relay
{1198} may be introduced via the RCC-02/03 remote control.
The transfer normally takes place without any interruption when the generator stops. It would
typically be 20 minutes in the event of the immediate loss of input voltage at “AC IN”.
The maximum current of the transfer relay is 30 A (50 A for XTH 8000-48). This means that the
permanent power of the consumers must be a maximum of 6,900 W to 230 V (11,500 W for the
XTH 8000-48). It cannot be higher if the “Smart Boost” function is activated {1126} (see chap.
6.2.7 p. 21). If the battery charger is in operation, part of this power will be used for the battery
charge.
When the transfer relay of the Xtender is active, the voltage at the output of the Xtender
is equivalent to that which is present at the input and cannot be influenced or improved
by the Xtender. The consumers are supplied by the source present at the “AC IN” input
via the transfer relay.
6.2.4 BATTERY CHARGER
The battery charger is designed in such a way as to guarantee charging of the battery that is as
complete as possible. The charging process is at four levels by default and guarantees optimum
charging of the batteries. The charging current is given by the configuration {1138} and can be
adjusted continuously from 0 to the nominal value with the help of the RCC-02/03.
6.2.5 BATTERY CHARGER
The battery charger for the Xtender is completely automatic and is designed in such a way as to
guarantee an optimum charge for the majority of the lead-acid or gel batteries. Once the transfer
relay is activated, the battery charger goes into operation and the charge indicator (44) lights up.
If the battery voltage is lower than the critical disconnection threshold {1488} operation of
the charger will be automatically prevented. Only the transfer relay is authorised to
operate in this case. The battery must then be recharged by an external source up to a
voltage higher than the critical disconnection threshold in order to allow the Xtender
charger to operate.

Steca Xtender
Installation and Operating Instructions 723.932 Xtender V0.511 Seite 20
The charge cycle, programmed by default,
as shown in the example described in the
figure opposite, runs automatically.
The line (28) indicates the development of
the battery voltage.
The lower line (29) indicates the battery
current (input and output).
The cycle starts with a continuous current
charge (a) adjusted by default according
to the configuration {1138}. If the ambient
temperature is increased or the ventilation
blocked, the current may be reduced and
become lower than the selected current.
Once the absorption voltage {1156) is
reached, the cycle passes to voltage
adjustment mode (d), known as the absorption phase, the duration of which is set by the
configuration {1157}. The minimum interval between two absorption cycles is limited by the
configuration {1161).
{1140}
{1156}
{1138}
{1159}
ade
28
29
ACin=OK
Cycle de charge simplifié, sans limitation de
courant d'entrée
At the expiry of the absorption time, or if the absorption current is lower than the configuration
{1159}, the voltage is set to a lower value {1140}. This phase (e) is known as the maintenance or
“floating” phase.
Given the limiting function for the input current (see the following p. 21), it is perfectly normal for
the charge current to be lower than the selected current if the limit of the AC input current {1107}
is reached (b). In this event the AC IN indicator (45) flashes.
If the “smart boost” function is activated {1126} and the power required by the consumer exceeds
the power of the source, the battery will be discharged (c) despite the presence of the grid or the
generator. In this case the LED “charge” (4) goes out. The consumers must ensure that they
have average consumption that is less than the power of the source (generator or public grid) in
order to avoid a complete discharge of the battery. These situations are set out in the figure
below.
ACin=OK
abcadec ade
{1156}
{1140}
In 0
Out
{1143}
{1138}
28
29
Fig 3a
Charge cycle example with input current limitation "smart boost”