WhisperPower 12-2000 User manual

USER MANUAL
Whisper Power Center
12-2000 / 24-3500 / 48-4000 / 24-5000 / 48-6000
Unit combining inverter, battery charger and
transfer system.
WHISPER POWER BV
Kelvinlaan 82
9207 JB Drachten
Netherlands
Tel.: [phone]
Fax.: [phone]
www.whisperpower.com
Art.nr. 40200895
V3 February 2020

TABLE OF CONTENTS
2 February 2020/ WPC / EN
TABLE OF CONTENTS
1 INTRODUCTION ................................................................................................................................................ 4
2 GENERAL INFORMATION .................................................................................................................................. 4
2.1 Operating instructions .................................................................................................................................... 4
2.2 Conventions .................................................................................................................................................... 5
2.3 Quality and warranty ...................................................................................................................................... 5
2.3.1 Exclusion of warranty ................................................................................................................................. 5
2.3.2 Exclusion of liability .................................................................................................................................... 6
2.4 Warnings and notes ........................................................................................................................................ 6
2.4.1 General ....................................................................................................................................................... 6
2.4.2 Precautions for using the batteries ............................................................................................................ 7
3 ASSEMBLY AND INSTALLATION ........................................................................................................................ 7
3.1 Handling and moving ...................................................................................................................................... 7
3.2 Storage ............................................................................................................................................................ 7
3.3 Unpacking ....................................................................................................................................................... 7
3.4 Installation site ................................................................................................................................................ 8
3.5 Fastening ......................................................................................................................................................... 8
3.5.1 Fastening .................................................................................................................................................... 9
3.6 Connections .................................................................................................................................................. 10
3.6.1 General recommendations ....................................................................................................................... 10
3.6.2 Device connection compartment ............................................................................................................. 10
3.6.3 Dipswitch functions .................................................................................................................................. 12
4 CABLING ......................................................................................................................................................... 14
4.1 Choice of system ........................................................................................................................................... 14
4.1.1 Hybrid type stand-alone systems ............................................................................................................. 14
4.1.2 Grid-connected emergency systems ........................................................................................................ 14
4.1.3 Integrated mobile systems ....................................................................................................................... 14
4.1.4 Multi-unit systems .................................................................................................................................... 14
4.1.5 Distributed Minigrid: ................................................................................................................................ 14
4.2 Earthing system ............................................................................................................................................. 15
4.2.1 Mobile installation or installation connected to the grid via plug connector .......................................... 15
4.2.2 Stationary installation .............................................................................................................................. 15
4.2.3 Installation with automatic PE-neutral switching ..................................................................................... 16
4.2.4 Lightning protection ................................................................................................................................. 16
4.3 Recommendations for dimensioning the system .......................................................................................... 16
4.3.1 Dimensioning the battery ......................................................................................................................... 16
4.3.2 Dimensioning the inverter ........................................................................................................................ 17
4.3.3 Dimensioning the generator .................................................................................................................... 17
4.3.4 Dimensioning the renewable energy sources .......................................................................................... 17
4.4 Wiring diagrams ............................................................................................................................................ 17
4.5 Connecting the battery ................................................................................................................................. 17
4.5.1 Battery cable cross-section and DC protective devices ............................................................................ 19
4.5.2 Connecting the battery (WPC side) .......................................................................................................... 19
4.5.3 Fuse mounting on battery positive pole ................................................................................................... 19
4.5.4 Battery-side connection ........................................................................................................................... 20
4.5.5 Earthing the battery ................................................................................................................................. 20
4.5.6 Connecting the consumers at the 230V AC outputs ................................................................................ 20
4.5.7 Connecting the AC supply sources ........................................................................................................... 21
4.5.8 Connecting the communications cables ................................................................................................... 21
4.5.9 Connecting the auto-start cable ............................................................................................................... 22
4.5.10 Connecting the temperature sensor (BTS-01) ..................................................................................... 22
5 POWERING UP THE INSTALLATION ................................................................................................................. 23
6 DESCRIPTION AND FUNCTIONING .................................................................................................................. 24
6.1 Circuit diagram .............................................................................................................................................. 24
6.2 Description of the main functions ................................................................................................................. 24
6.2.1 Inverter ..................................................................................................................................................... 24
6.2.2 Automatic load detection ......................................................................................................................... 24

TABLE OF CONTENTS
February 2020/ WPC / EN 3
6.2.3 Transfer relay ........................................................................................................................................... 25
6.2.4 Battery charger ......................................................................................................................................... 27
6.2.5 Battery protection .................................................................................................................................... 28
6.2.6 WPC protection ........................................................................................................................................ 29
7 MULTI-UNIT CONFIGURATION ........................................................................................................................ 30
7.1.1 Three-phase system ................................................................................................................................. 30
7.1.2 Increasing the power by paralleling units ................................................................................................ 30
7.1.3 Combined system ..................................................................................................................................... 30
7.1.4 Enlargement of an existing installation .................................................................................................... 30
7.2 Accessories .................................................................................................................................................... 31
7.2.1 Control centre and display WPC-RCC/PSCP (remote control) .................................................................. 31
7.2.2 BTS-01 temperature sensor ...................................................................................................................... 32
8 CONTROL ....................................................................................................................................................... 32
8.1 Display and control panel .............................................................................................................................. 32
9 TABLE OF FACTORY’S (DEFAULTS) PARAMETERS SETTINGS ............................................................................. 35
10 TECHNICAL DATA – WPC ................................................................................................................................. 38
10.1 Type plate ...................................................................................................................................................... 38
10.2 Specifications ................................................................................................................................................ 38
10.3 Dimensions .................................................................................................................................................... 41
11 MAINTENANCE OF THE INSTALLATION ........................................................................................................... 42
12 PRODUCT RECYCLING ..................................................................................................................................... 42
13 EEC DECLARATION OF CONFORMITY .............................................................................................................. 43

INTRODUCTION
4 February 2020/ WPC / EN
1 INTRODUCTION
Congratulations! You are about to install and use a device from the Whisper Power Centre range. You have chosen a
high-tech device that will play a central role in energy saving for your electrical installation. The WPC 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 WPC is connected to a generator or grid, the latter directly supplies the consumers, and the WPC works like
a battery charger and backup device if necessary. The powerful battery charger has an exceptional high efficiency and
power factor correction (PFC) 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 WPC output and the power of the energy
source (grid or generator). It can even temporarily backup the source if the consumer demand exceeds the source
capacity.
The WPC continuously monitors the source to which it is connected (grid 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 WhisperPower’s many years of experience and expertise in this area. It could supply 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 grid) or voluntarily limited or interrupted, such as hybrid installations on remote sites or
mobile installations.
2 or 3 units can be connected to more (2 or 3) of the grid and work in parallel with this phases an support them. Also
they can generate 2 or 3 phases being connected to a single phase grid. Up till 9 units can be combined to a integrated
power full system
The parallel and/or three-phase grid operation of the WPC offers modularity and flexibility and enables optimum
adaptation of your system to your energy requirements.
The WPC-RCC/PSCP control, display and programming centre enables optimum parametering of the system and
guarantees the operator continuous control for all important parameters 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 WPC 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.
2 GENERAL INFORMATION
2.1 OPERATING INSTRUCTIONS
This manual is an integral part of each inverter/charger from the WPC series.
It covers the following models and accessories:
Inverter/charger: WPC 2000-12, WPC 3500-24, WPC 4000-48, WPC 5000-24
Temperature sensor: WPC-BTS-01
Remote command module: WPC-RCC, WPC-PSCP
For greater clarity, the device is referred to in this manual as WPC, unit or device, when the description of its functioning
applies indiscriminately to different WPC models.
These operating instructions serve as a guideline for the safe and efficient usage of the WPC. Anyone who installs or
uses a WPC can rely completely on these operating instructions, and is bound to observe all the safety instructions and
indications contained. The installation and commissioning of the WPC 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.

GENERAL INFORMATION
February 2020/ WPC / EN 5
2.2 CONVENTIONS
All values mentioned hereafter, followed by a parameter number indicate that this value may be modified using the
WPC remote control.
In general, the default values are not mentioned and are replaced by a parameter number in the following format:
{xxxx}. The default values for this parameter are specified in the defaults parameter table, p. 35.
All parameter values modified by the operator or installer must be transferred into the same table. If a
parameter not appearing in the list (advanced parameters) has been modified by an authorised person with
technical knowledge, they will indicate the number of the modified parameter(s), the specifications of the
parameter(s) and the new value set, at the end of the same table.
All figures and letters indicated in brackets or in square brackets refer to items that can be found in the separate manual
“Appendix to the installation and operating instructions” supplied with the device. In this appendix, these figures and
letters are encircled.
• The figures in brackets refer to elements belonging to the WPC.
• The uppercase letters in brackets refer to AC cabling elements.
• The lowercase letters in brackets refer to DC battery cabling elements.
• The comments on figures and items of the appendix are given starting on p. 42.
2.3 QUALITY AND WARRANTY
During the production and assembly of the WPC, each unit undergoes several checks and tests. These are carried out
with strict adherence to the established procedures. Each WPC 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 which shows the serial number. The manufacture, assembly and tests for each WPC are carried out in their entirety
by our factory in Drachten (the Netherlands). The warranty for this equipment depends upon the strict application of
the instructions appearing in this manual.
The warranty period for the Whisper Power Centre is 2 years. Refer to the Whisper Power general conditions of sales.
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 WPC 2000-12)
• Incorrect polarity of the battery (mixing up + and -)
• 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 WhisperPower
• Nuts or screws that have not been tightened sufficiently during the installation or maintenance. High currents

GENERAL INFORMATION
6 February 2020/ WPC / EN
through poor connections can cause extreme heat and fire.
• 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 WPC cannot be the subject of monitoring by
WhisperPower. 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 a
WhisperPower Centre 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.
WhisperPower 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 parameter table available at the end of the manual (p. 35) must be kept up to date in the event of modification of
the parameters 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 WPC 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 WPC 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 DC voltage coming
from the battery as well as the source of AC voltage coming from a generator or grid have been disconnected
from the electrical installation.
Even when the WPC 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 WPC 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 WPC must comply with the applicable laws and regulations.
Persons not holding written authorisation from WhisperPower 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
WPC. 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 WPC is only designed for indoor 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. 1b, must be adhered to.
In the event of use in motorised vehicles, the WPC must be protected from dust, splash water and any other humid
condition. It must also be protected from vibration by installing absorbent parts like rubber moutings.
The WPC can be installed at altitudes up to 3000m. For installations at higher altitudes, please contact
WhisperPower. The WPC is in overvoltage category III, which indicates that it can be installed directly after
the protection device at the entrance of a building.

GENERAL INFORMATION
February 2020/ WPC / EN 7
2.4.2 Precautions for using the batteries
The batteries should only be chosen, dimensioned and installed by qualified personnel, trained in this
specific area.
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. Sparks resulting from these short-
circuits can cause the battery to explode. Therefore, tools with insulated handles should be used and they
should never be left to rest on top of the batteries. When working with the batteries, all metal jewellery
such as rings, watches with a metal bracelet, earrings, etc., must be taken off. The current supplied by the
batteries during a short circuit is sufficiently powerful to melt the metal and cause severe burns.
Batteries at the end of their life-cycle should be recycled in accordance with directives from the
responsible local authorities or the battery supplier. The batteries should never be exposed to fire as they
may explode. Under no circumstances should you try to take apart or dismantle the battery, as they
contain toxic and polluting materials. For ungrounded battery systems, always check that they are not
inadvertently grounded before starting work on the batteries.
Always follow carefully the instructions of the battery manufacturer.
3 ASSEMBLY AND INSTALLATION
3.1 HANDLING AND MOVING
The weight of the WPC 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 stays in
the location where it is to be used a minimum of 24 hours before being set up.
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 WPC carefully.
Standard accessories:
• Installation and operating instructions, c.f. Appendix 1
• Mounting plate – fig. 2a (18)
• Cable gland

ASSEMBLY AND INSTALLATION
8 February 2020/ WPC / EN
3.4 INSTALLATION SITE
The installation site for the WPC is of particular importance and must satisfy the following criteria:
• Protected from any unauthorised person.
• Protected 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 WPC.
• Ventilation apertures must always remain clear and be at least 20cm from any obstacle that may affect the
ventilation of the equipment.
• In mobile applications it is important to select an installation site that ensures as low a vibration level as
possible.
3.5 FASTENING
The WPC is a heavy unit and must be mounted to a wall designed to bear such a load. A simple wooden
panel is insufficient.

ASSEMBLY AND INSTALLATION
February 2020/ WPC / EN 9
The WPC must be installed vertically with sufficient space around it to guarantee adequate ventilation of the device.
3.5.1 Fastening
Fastening of the WPC 5000-24
First fix the mounting bracket (26) supplied with the device using 2 Ø < 6-8 mm
>screws.
Then hang the WPC 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.
Fastening the other WPC models
Screw on a solid wall (concrete or metallic wall) the supplied mounting washer using a suitable bolt.
Hang the WPC unit on the wall using the upper bracket on the backside of the WPC. Make sure that the bracket is
securely fixed. For mobile and marine applications it is also necessary to fix the unit using the bottom mount. Use two
bolts to secure the bottom mount to the wall.

ASSEMBLY AND INSTALLATION
10 February 2020/ WPC / EN
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 WPC must be mounted on anti-vibration
supports.
3.6 CONNECTIONS
3.6.1 General recommendations
The WPC 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 (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 WPC (equipotential bonding). It is mandatory 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.
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 (11) and (12).
3.6.2 Device connection compartment

ASSEMBLY AND INSTALLATION
February 2020/ WPC / EN 11
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.
Some accessible part inside the compartment can have surface temperature higher than 60°C. Wait for the
complete cooling of the unit before opening the compartment.
WPC 12/2000 – 24/3500 – 48/4000 models
WPC 5000-24
2
3
10
10
11
10
12
10
13
10
14
10
15
10
16
10
1
4
17
10

ASSEMBLY AND INSTALLATION
12 February 2020/ WPC / EN
Pos.
Denomination
Description
Comment
1
Auto start
Connector for connecting the auto-
start cable
Refer to DDC and RCC/PSCP manual
2
Temp. Sens
Connector for the battery
temperature sensor
See chapter 8.2.2 – p. 32.
Only connect the original WhisperPower BTS-01
sensor
3
WPC bus
Double connector for connecting
peripherals such as the RCC/PSCP or
other WPC units
See chapter 0 – p. 21.
The two termination switches (4) for the
communication bus both remain in position T
(terminated) except when both connectors are in
use.
4
O / T
(Open /
Terminated)
Switch for terminating the
communication bus.
5
--
3.3 V (CR-2032) lithium ion type
battery socket
Used as a permanent supply for the internal
clock. See sect. 7.6 - p. 31.
6
--
Jumper for programming the off/on
switch by dry contact
See sect. 7.7 – p. 31 and fig. 8b point (6) and (7).
They are positioned at A-1/2 and B-2/3 by
default.
7
Command entry
(REMOTE
ON/OFF)
Entry command terminals (only
applicable for WPC 5000-24)
Allows the control of a function – to be defined
by programming – by the closing of a dry contact
or by the presence of a voltage across these
terminals. See sect. 7.7 – p. 31).
8
AUXILLARY
CONTACT
Auxiliary contact (only applicable for
WPC 5000-24)
(See sect. 7.5 – p. 31)
Take care not to exceed the admissible loads.
9
--
Activation indicators for auxiliary
contacts 1 and 2
See sect. 7.5 – p. 31.
10
L1/L2/L3
Phase selection jumpers.
Jumper default at position L1
11
+BAT
Positive pole battery connection
terminals
Carefully read chapter 4.5 – p.17
Take care with the polarity of the battery and
when tightening the clamp.
12
-BAT
Negative pole battery connection
terminals
13
AC Input
Generator**
Connection terminals for the AC
generator
See chapter 0 - p. 21.
Note: It is imperative that the PE terminal be
connected.
14
AC Input Grid
Connection terminals for the AC grid
See chapter 0 - p. 21.
Note: It is imperative that the PE terminal be
connected.
15*
AC Output
Gen/Grid/Inv*
Connection terminals for the device
output. (Continuous)
See chapter 4.5.6 - p. 21.
Note: Increased voltages may appear on the
terminals, even in the absence of voltage at the
input of the inverter.
16
AC Output
Gen/Grid**
Connection terminals for the device
output.(Only active when AC input is
present)
See chapter 4.5.6 - p. 21.
Note: Increased voltages may appear on the
terminals, even in the absence of voltage at the
input of the inverter.
17
Protective earth
See chapter 3.6.1 – p. 10 and 4.2 p. 15
* For WPC 5000-24, this is no 14, inverter output
** Double input/output only on WPC 12/2000 – 24/3500 – 48/4000 models

ASSEMBLY AND INSTALLATION
February 2020/ WPC / EN 13
3.6.3 Dipswitch functions (only applicable for WPC 2000-12, 3500-24 and 4000-48)
To set the behavior of the input switching component of the WPC a dipswitch is available at the input switching board.
To access it, open the connection compartment cover. The figure below show the location of the dipswitch.
Dipswitch location
Dipswitch
Function
Default
1
Prohibit automatic start when grid is available
On
2
Preferred input ON = Grid
Off = Generator
Off
3.6.3.1 Prohibit automatic start when grid is available
Default the generator will automatically start when one of auto start criteria is met. It starts even when the is AC grid is
connected. In some cases the AC grid can supply more power than the generator. In this situation it is most likely that
starting of the generator is not wanted. To prohibit the generator from starting in this situation set the upper dipswitch
to the “ON” position. Now the Autostart signal will indicate “start” only when there is no grid available. Refer to the
figure above for the position of the dipswitch.
3.6.3.2 Preferred input
When both AC inputs are available, this setting will determine which AC input is passed through for power delivery.

COMMISSIONING
14 February 2020/ WPC / EN
4 CABLING
The connection of the WPC 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.
4.1 CHOICE OF SYSTEM
The WPC 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.
4.1.1 Hybrid type stand-alone systems
The WPC can be used as a primary supply system for off-grid 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.
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 WPC transfer relay.
4.1.2 Grid-connected emergency systems
The WPC 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 grid. In the event of an interruption to the energy supply from the public
grid, the WPC, 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.
The use of the WPC 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. For these
purposes the WPC has a double AC input: one for the grid connection and one for a generator.
4.1.4 Multi-unit systems
Whatever system is selected, it is possible to realise systems composed of several units of the same type and the same
power output. Up to three WPC’s in parallel or three WPC’s forming a three-phase grid or three times two or three
WPC’s in parallel forming a three-phase / parallel grid, may be thus combined.
4.1.5 Distributed Minigrid:
The implementation of the WPC on top of a distributed minigrid (beyond the main building) requires special care in
choosing the distribution system.
WhisperPower recommends a TT distribution for the DC grid as well as for the AC grid.
The size of the grid increases greatly the exposure of the inverters to atmospheric overvoltages and to non
equipotentiality in the grid. This is particularly noticeable in the aerial distribution grids. In this case a very
special care must be taken to well implementing all protection measures of the installation.
The IT system is not recommended for the distribution. This kind of distribution is most of the time forbidden
by the local laws. The achievement of low voltage electric system is always subject to local laws and must
imperatively be implemented and controlled by qualified and professionally authorized staff. WhisperPower

ASSEMBLY AND INSTALLATION
February 2020/ WPC / EN 15
4.2 EARTHING SYSTEM
The WPC 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 WPC 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.
*The International standard IEC 60364 distinguishes three families of earthing arrangements, using the two-letter
codes TN, TT, and IT.
The first letter indicates the connection between earth and the power-supply equipment (generator or
transformer):
T Direct connection of a point with earth (Latin: terra);
I No point is connected with earth (isolation), except perhaps via a high impedance.
The second letter indicates the connection between earth and the electrical device being supplied:
T Direct connection of a point with earth
N Direct connection to neutral at the origin of installation, which is connected to the earth
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 WPC.
The earthing system downstream of the WPC 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 WPC is not permitted in
this configuration.
This connection type guarantees the optimal continuity for supplying the WPC 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
grid is present at the WPC input.
All sockets and protection class I devices connected downstream of the WPC must be properly connected to
the earth (earthed socket). The cabling rules above remain valid, including in installations, in all cases where
the WPC input is connected to the grid via a plug connector.
4.2.2 Stationary 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 WPC, 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 WPC. This choice has the advantage of keeping the protection devices
downstream of the WPC. This connection can be executed according to the next figure, or carried out by modifying the
accepts no liability for damages due to non-confirming installation and to the lack of compliance with the local
rules or with the recommendations of this manual.

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parameter {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 WPC.
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 WPC.
4.2.3 Installation with automatic PE-neutral switching
In certain applications, it is desirable to keep the neutral upstream and downstream of the WPC separated (C) while re-
establishing the earthing system (TN-S, TT or TNC-S) in the absence of voltage at the input. This functionality is forbidden
by default by the parameter {1485}. This parameter can be modified by the parameter {1485} via the WPC-RCC/PSCP
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.
The authorization of this function adherence to the requirements for an earth-neutral connection at the source.
4.2.4 Lightning protection
As per the installation site, it is highly recommended to set a protection strategy to protect your installation against
lightning. The strategies depend on various parameters directly linked to each site and we recommend therefore to
deal very professionally with this issue.
The damages due to lightning are generating most of the time significant costs (full replacing of the printed
electronic board) and are not covered by WhisperPower’s warranty.
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 WPC 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 WPC / the battery voltage. For example, the model
3500W/24V must have a battery of a minimum capacity of 3500*5/24=730 Ah (C 10). Because of the inverter’s extreme
overload capacity, it is often recommended that this value be rounded up. (In the example round up to 800 Ah) An
under-dimensioned battery may lead to an accidental and undesired stopping of the WPC in the event of high instances
of use. This stoppage will be due to a voltage that is insufficient on 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 parameter {1137} “battery charge current”. A value between 0.1
and 0.2 x C batt. [Ah] (C10) enables an optimum charge to be guaranteed. (F.i. 50 up to 1000 Amp charge current for a
500 Ah battery)

ASSEMBLY AND INSTALLATION
February 2020/ WPC / EN 17
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 WPC 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
once or twice times this power. Thanks to the Smart Boost function (see chap.7.2.5 p.28) it is not necessary to over-
dimension the generator. Indeed, the loads those 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
WPC(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 if the Smart Boost function is activated. The sum of the currents (generator + inverter) is
limited to a maximum of 30A.
4.3.4 Dimensioning the renewable 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
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 WPC usage, several batteries must be connected in series or in parallel depending on the
circumstances.
The diagrams shown in 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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ASSEMBLY AND INSTALLATION
February 2020/ WPC / EN 19
4.5.1 Battery cable cross-section and DC protective devices
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.
In order to avoid any further loss and protection redundancy. A protective device (f) must be installed as close as possible
to the battery and sized according to the below table.
The recommended cable cross-sections are valid for lengths
less than 3 m. Beyond this length it is strongly recommended
oversize the battery cables.
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.
4.5.2 Connecting the battery (WPC side)
Insert the cable glands supplied on the battery cable before tightening the cable lugs. Crimp the cable lugs and fasten
the cable gland on the device. Repeat this for the second battery cable. Fix the battery cables to the appropriate
connections „+ Battery “and „- Battery “. The M8 screws must be very well tightened.
You can insert, if required, a fuse directly on the positive connection to the battery following the below procedure.
If cable glands are omitted or if there is no cable is inserted in the cable gland, there is a high risk of
penetrating of small animals inside the unit and a risk of damage not covered by warranty. Any unused gable
gland on the unit must be properly closed.
4.5.3 Fuse mounting on battery positive pole
A fuse delivered with the unit (WPC) can be mounted directly on the positive connecting pole to the battery respecting
the below stacking order.
The presence of this fuse does not exempt an installation of a protective device (fuse or circuit breaker) as close as
possible of the battery.
Be careful with the orientation of the ceramic washer. There is a small lip on one side which must fit into the
M10 cable lug’s hole.
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 not connected to the earth
Range
Battery side fuse
Section of
cable (<3m)
WPC-5000-24
300A
95mm2
WPC-4000-48
200A
50mm2
WPC-3500-24
300A
70mm2
WPC-2000-12
300A
70mm2
The cable lugs must be carefully fixed and
tightened sufficiently to guarantee minimum
loss. Insufficient tightening may cause dangerous
heating at the connection point.
a = M10 cable lug
b = bolt M10 x 30
c = washer
d = ceramic washer
e = fuse

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4.5.4 Battery-side connection
Before connecting the battery, carefully check the voltage and polarity of the battery using a voltmeter.
Incorrect polarity or over-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 negative cable on to the negative pole (-) of the battery and the positive cable on the open protection device
(f).
When connecting the battery, a spark may occur when connecting the second pole. This spark is normal and
due to the charging of the internal filtering capacitor of the WPC even if the unit is halted by the main On/Off
command (1).
The default values of the battery’s charge threshold level are shown in fig. 3a and specified in the parameter table p.35.
If they are not acceptable when compared to the batterys manufacturer’s specification, it is necessary to modify them
via the remote control before connecting the voltage sources on the AC input (charger). WhisperPower 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 parameter table on p. 35 of this manual.
The default values proposed by WhisperPower are the usual values for lead acid battery or gel batteries (VRLA or AGM).
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.
4.5.5 Earthing the battery
One of the two battery conductors can be earthed. This may be either the positive or negative pole. However in Europe
in most cases the negative conductor is grounded. This is recommended by Whisper Power. 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 (17), which is located at the front of the device between the two lower fastening screws.
4.5.6 Connecting the consumers at the 230V AC outputs
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 230V consumers must be connected to the “AC OUT” (15) and (16) connection terminals with the wire section
conforming to the standards with regard to the rated current at the WPC output. Distribution must conform to the local
standards and regulations, and generally, be realised via a distribution table.
The WPC terminals are marked in the following way:
N = neutral, L = live
PE = protective earth (connected to the enclosure of the device).
As of the connection of the battery, it is necessary to check that the parameter values of the WPC are
consistent with the recommendations of the battery manufacturer. Non-conforming values may be
dangerous and/or seriously damage the batteries.