Victron energy MultiPlus 12/800/35 User manual

Manual
EN
Handleiding
NL
Manue
l
FR
Anleitung
DE
Manual
ES
Appendix
MultiPlus 800VA
12 | 800 | 35 220-240V
24 | 800 | 16 220-240V
48 | 800 | 9 220-240V

2
1. SAFETY INSTRUCTIONS
General
Please familiarize yourself with the safety features and instructions by first reading the
documentation supplied with this product before using the equipment. This product has been
designed and tested in accordance with international standards. The equipment must be used
exclusively for the purpose for which it was designed.
WARNING: ELECTRIC SHOCK HAZARD.
The product is used in conjunction with a permanent energy source (battery). Input and/or
output terminals may still be dangerously energized, even when the equipment is switched off.
Always switch off the AC supply and the battery before carrying out maintenance or servicing
the product.
The product has no internal user-serviceable components. Do not remove the front plate or
operate the product if any panels have been removed. All servicing must be undertaken by
qualified personnel.
Never use the product where there is a risk of gas or dust explosions. Consult the battery
manufacturer's information to ascertain that the product is intended for use in conjunction with
the battery. Always comply with the battery manufacturer's safety instructions.
WARNING: Do not lift heavy loads without assistance.
Installation
Read the installation instructions in the installation manual before installing the equipment.
This is a Safety Class I product (supplied with a protective grounding terminal).
Uninterruptible protective grounding must be provided at the AC input and/or output
terminals. Alternatively the grounding point located externally on the product may be
used. Whenever it is likely that the grounding protection has been damaged, the product must
be turned off and secured against unintended operation; please contact qualified service staff.
Ensure that the DC and AC input cables are fused or fitted with circuit breakers.
Ensure that the equipment is used under the correct ambient conditions. Never operate the
product in a wet or dusty environment. Ensure there is adequate free space for ventilation
around the product and check that the ventilation vents are not blocked.
Ensure that the required system voltage does not exceed the product's capacity.

3
EN NL FR DE ES Appendix
Transport and Storage
Ensure that the mains power and battery leads have been disconnected before storing or
transporting the product.
No liability can be accepted for any transport damage if the equipment is shipped in non-
original packaging.
Store the product in a dry environment; the storage temperature must be between -40°C
and 70°C.
Consult the battery manufacturer's manual in respect of transport, storage, charging,
recharging and disposal of the battery.

4
2. DESCRIPTION
2.1 General
Multi-functional
The MultiPlus gets its name from the multiple functions it can perform. It is a powerful true
sine wave inverter, a sophisticated battery charger that features adaptive charge technology
and a high-speed AC transfer switch in a single enclosure. Beside these primary functions,
however, the MultiPlus has several advanced features that provide a range of new
applications as outlined below.
Uninterrupted AC power
In the event of a grid failure, or shore or generator power being disconnected, the inverter
within the MultiPlus is automatically activated and takes over supply to the connected loads.
This happens so fast (less than 20 milliseconds) that computers and other electronic
equipment will continue to operate without disruption.
Parallel and 3-phase operation capability
Up to 6 inverters can operate in parallel to achieve higher power output.
Operation in 3-phase configuration is also possible.
PowerControl – Dealing with limited generator or shore side power
With a Multi Control Panel a maximum generator or shore current can be set. The MultiPlus
will then take account of other AC loads and use whatever is extra for charging, thus
preventing the generator or shore supply from being overloaded.
PowerAssist – Boosting the capacity of shore or generator power
This feature takes the principle of PowerControl to a further dimension allowing the MultiPlus
Compact to supplement the capacity of the alternative source. Where peak power is so often
required only for a limited period, it is possible to reduce the size of generator needed or
conversely enable more to be achieved from the typically limited shore connection. When the
load reduces, the spare power is used to recharge the battery.
Remark 1: In case of parallel operation with a generator, power of the generator must not be
less than the capacity of the MultiPlus Compact (Example: a generator suitable for parallel
operation with a MultiPlus Compact 12/1600/70 must have a power of at least 1600VA).
Remark 2: The output voltage of a generator can be greatly disrupted. In that case, the "AC
waveform check" should be turned off.
Programmable relay
The MultiPlus is equipped with a programmable relay that by default is set as an alarm relay.
The relay can be programmed for all kinds of other applications however, for example as a
starter relay for a generator.
2.2 Battery charger
Adaptive 4-stage charging characteristics: bulk – absorption – float – storage
The microprocessor-driven adaptive battery management system can be adjusted for various
types of batteries. The adaptive function automatically adapts the charging process to battery
use.

5
EN NL FR DE ES Appendix
The right amount of charge: variable absorption time
In the event of slight battery discharge, absorption is kept short to prevent overcharging
and excessive gas formation. After deep discharging, the absorption time is automatically
extended in order to fully charge the battery.
Preventing damage due to excessive gassing: the BatterySafe mode
If, in order to quickly charge a battery, a high charge current in combination with a high
absorption voltage has been chosen, damage due to excessive gassing will be prevented
by automatically limiting the rate of voltage increase once the gassing voltage has been
reached.
Less maintenance and aging when the battery is not in use: the Storage mode
The Storage mode kicks in whenever the battery has not been subjected to discharge
during 24 hours. In the Storage mode float voltage is reduced to 2,2V/cell (13,2V for 12V
battery) to minimise gassing and corrosion of the positive plates. Once a week the voltage
is raised back to the absorption level to ‘equalize’ the battery. This feature prevents
stratification of the electrolyte and sulphation, a major cause of early battery failure.
Two DC outputs for charging two batteries
The main DC terminal can supply the full output current. The second output, intended for
charging a starter battery, is limited to 1A and has a slightly lower output voltage.
Increasing service life of the battery: temperature compensation
The temperature sensor (supplied with the product) serves to reduce charging voltage
when battery temperature rises. This is particularly important for maintenance-free
batteries, which could otherwise dry out by overcharging.
More on batteries and charging
Our book ‘Energy Unlimited’ offers further information on batteries and battery charging, and
is available free of charge on our website (see www.victronenergy.com Support &
Downloads’ General Technical Information). For more information on adaptive charging,
please also refer to the General Technical Information on our website.

6
3. OPERATION
3.1 On / Off / Charger-only Switch
When switched to ‘on’, the product is fully functional. The inverter will come into operation and
the LED ‘inverter on’ will light up.
An AC voltage connected to the ‘AC in’ terminal will be switched through to the ‘AC out’
terminal, if within specifications. The inverter will switch off, the ‘Charger’ LED will light up and
the charger commences charging. If the voltage at the ‘AC-in’ terminal is not within
specifications, the inverter will switch on.
When the switch is switched to ‘charger only’, only the battery charger of the MultiPlus will
operate (if mains voltage is present). In this mode input also is switched through to the ‘AC
out’ terminal.
NOTE: When only the charger function is required, ensure that the switch is switched to
‘charger only’. This prevents the inverter from being switched on if the mains voltage is lost,
thus preventing the batteries from running flat.
3.2 Remote control
Remote control is possible with a 3 position switch or with a Multi Control panel.
The Multi Control panel has a simple rotary knob with which the maximum current of the AC
input can be set: see PowerControl in Section 2.
For the appropriate DIP switch settings, see sect. 5.5.1.

7
EN NL FR DE ES Appendix
3.3 LED Indications
Inverter/Charger
On / Off / Charger-only switch = On
The inverter is switched on and supplies power to the load.
On / Off / Charger-only switch = On
The inverter is switched on and supplies power to the load.
Pre alarm: overload, or
battery voltage low, or
inverter temperature high.
On / Off / Charger-only switch = On
The inverter is switched off due to one of the following alarms:
overload, or
battery voltage low, or
inverter temperature high, or
DC ripple voltage too high.
On / Off / Charger-only switch = On
The AC input voltage is switched through and the charger operates in
float mode.
Charger only
On / Off / Charger-only switch = Charger only
The AC input voltage is switched through and the charger operates in
bulk or absorption mode.
On / Off / Charger-only switch = Charger only
The AC input is switched through and the charger operates in float or
storage mode.
Note: the MultiPlus will shut down if four abnormal events occur within 30 seconds.
The MultiPlus can be reset by switching to Off and then to On.
LED off
LED flashes
LED illuminated

8
4. INSTALLATION
4.1 Location
The product must be installed in a dry and well-ventilated area, as close as possible to the
batteries. There should be a clear space of at least 10cm around the appliance for cooling.
For mounting see appendix F.
For safety purposes, this product should be installed in a heat-resistant
environment. Prevent the presence of e.g. chemicals, synthetic components,
curtains or other textiles, etc., in the immediate vicinity.
4.2 Connection of the Battery cables
In order to fully utilize the full capacity of the product, batteries with sufficient capacity and
battery cables with sufficient cross section should be used. See table:
48/800/9
24/800/16
12/800/35
Recommended cross
section (mm
2
)
1,5 5 m
10
16
25
Recommended battery
capacity (Ah)
20 – 100 40 – 200 100 – 400
Procedure
Proceed as follows to connect the battery cables:
Use an insulated box spanner in order to avoid shorting the battery.
Avoid shorting the battery cables.
Connect battery cables to the MultiPlus and battery, see appendix A.
Reverse polarity connection will cause damage to the product. (Safety fuse inside the
MultiPlus can be damaged)
This product should be installed by a qualified electrician.
a. Excessively high ambient temperature will result in the following:
- Reduced service life.
- Reduced charging current.
- Reduced peak capacity, or shutdown of the inverter.
b. Never mount the product directly above the batteries.

9
EN NL FR DE ES Appendix
4.3 Connection of the AC cabling
The MultiPlus is provided with a ground relay (relay H, see appendix B) that
automatically connects the Neutral output to the chassis if no external AC supply is
available. If an external AC supply is provided, the ground relay H will open before the
input safety relay closes. This ensures the correct operation of an earth leakage circuit
breaker that is connected to the output.
- In a fixed installation, uninterruptable grounding can be secured by means of the
grounding wire of the AC input. Otherwise the casing must be grounded.
- In a mobile installation, interrupting the shore connection will simultaneously disconnect
the grounding connection. In that case, the casing must be connected to the chassis (of
the vehicle) or to the hull or grounding plate (of the boat).
- In case of a boat, direct connection to the shore ground is not recommended because of
potential galvanic corrosion. The solution to this is using an isolation transformer.
The mains input & output terminal connector can be found on the bottom of the MultiPlus,
see appendix A. The shore or mains cable must be connected to the connector with a
three-wire cable. Use a three-wire cable with a flexible core and a cross section of 2.5
mm².
Procedure (see appendix A)
Proceed as follows to connect the AC cables:
The AC output cable can be connected directly to the male-connector. (the connector pulls
out!)
The terminal points are indicated clearly. From left to right: ‘N’ (neutral), earth, and ‘L1’
(phase).
The AC input cable can be connected directly to the female-connector. (the connector pulls
out!)
The terminal points are indicated clearly. From left to right: ‘L1’ (phase), earth, and ‘N’
(neutral).
Push the ‘input’ connector into the AC-in connector.
Push the ‘output’ connector into the AC-out connector.
This is a Safety Class I product (supplied with a protective grounding terminal).
Uninterruptible protective grounding must be provided at the AC input
and/or output terminals and/or chassis grounding point located externally
on the product.

10
4.4 Optional Connections
A number of optional connections are possible:
Undo the four screws at the front of the enclosure and remove the front panel.
4.4.1 Second Battery
The MultiPlus has a connection (+) for charging a starter battery. For connection see
appendix A
4.4.2 Temperature Sensor
The temperature sensor supplied with the product may be used for temperature-compensated
charging. The sensor is insulated and must be mounted on the battery minus pole. Default
output voltages for Float and Absorption are at 25°C. In adjust mode temperature
compensation is disabled.
4.4.3 Remote Control
The product can be remotely controlled in two ways:
- With an external 3 position switch
- With a Multi Control Panel
Please see section 5.5.1. for appropriate DIP switch settings.
4.4.4. Programmable relay
The MultiPlus is equipped with a multi-functional relay that by default is programmed as an
alarm relay. The relay can be programmed for all kinds of other applications, for example to
start a generator (VEConfigure software needed).
4.4.5 Parallel Connection
The MultiPlus can be connected in parallel with several identical devices. To this end, a
connection is established between the devices by means of standard RJ45 UTP cables. The
system (one or more MultiPlus units plus optional control panel) will require subsequent
configuration (see Section 5).
In the event of connecting MultiPlus units in parallel, the following requirements must be met:
- A maximum of six units connected in parallel.
- Only identical devices may be connected in parallel.
- The DC connection cables to the devices must be of equal length and cross-section.
- If a positive and a negative DC distribution point is used, the cross-section of the connection between the
batteries and the DC distribution point must at least equal the sum of the required cross-sections of the
connections between the distribution point and the MultiPlus units.
- Place the MultiPlus units close to each other, but allow at least 10 cm for ventilation purposes under,
above and beside the units.
- UTP cables must be connected directly from one unit to the other (and to the remote panel).
Connection/splitter boxes are not permitted.
- A battery-temperature sensor need only be connected to one unit in the system. If the temperature of
several batteries is to be measured, you can also connect the sensors of other MultiPlus units in the system
(with a maximum of one sensor per MultiPlus). Temperature compensation during battery charging
responds to the sensor indicating the highest temperature.
- Voltage sensing must be connected to the master (see Section 5.5.1.4).
- If more than three units are connected in parallel in one system, a dongle is required (see Section 5).
- Only one remote control means (panel or switch) can be connected to the system.

11
EN NL FR DE ES Appendix
4.4.6 Three-phase operation (see appendix D)
The MultiPlus can also be used in 3-phase wye (Y) configuration. To this end, a
connection between the devices is made by means of standard RJ45 UTP cables (the
same as for parallel operation). The system (MultiPlus units plus an optional control
panel) will require subsequently configuration (see Section 5).
Pre-requisites: see Section 4.4.5.
Note: the MultiPlus is not suitable for 3-phase delta (Δ) configuration.

12
5. CONFIGURATION
Settings may only be changed by a qualified engineer
Carefully read the instructions before changes are made.
Batteries should be placed in a dry and well-ventilated area during charging.
5.1 Standard settings: ready for use
On delivery, the MultiPlus is set to standard factory values. In general, these settings are
suitable for single-unit operation.
Warning:Possibly, the standard battery charging voltage is not suitable for your
batteries! Refer to the manufacturer's documentation or to your battery supplier!
Standard MultiPlus factory settings
Inverter frequency 50 Hz
Input frequency range 45 - 65 Hz
Input voltage range 180 - 265 VAC
Inverter voltage 230 VAC
Stand-alone / parallel / 3-phase stand-alone
Search mode off
Ground relay on
Charger on/ off on
Battery charge algorithm four-stage adaptive with BatterySafe mode
Charge current 75% of the maximum charge current
Battery type Victron Gel Deep Discharge (also suitable
for Victron AGM Deep Discharge)
Automatic equalisation charging off
Absorption voltage 14.4 / 28.8 / 57,6V
Absorption time up to 8 hours (depending on bulk time)
Float voltage 13.8 / 27.6 / 55,2V
Storage voltage 13.2 / 26.4 / 52,8V (not adjustable)
Repeated absorption time 1 hour
Absorption repeat interval 7 days
Bulk protection off
AC input current limit 12A (= adjustable current limit for PowerControl)
UPS feature on
Dynamic current limiter off
WeakAC off
BoostFactor 2
Programmable relay alarm function

13
EN NL FR DE ES Appendix
5.2 Explanation of settings
Settings that are not self-explanatory are described briefly below. For further information,
please refer to the help files in the software configuration programs (see Section 5.3).
Inverter frequency
Output frequency if no AC is present at the input.
Adjustability: 50Hz; 60Hz
Input frequency range
Input frequency range accepted by the MultiPlus. The MultiPlus synchronises within this
range with the AC input frequency. The output frequency is then equal to the input
frequency.
Adjustability: 45 – 65Hz; 45 – 55Hz; 55 – 65Hz
Input voltage range
Voltage range accepted by the MultiPlus. The MultiPlus synchronises within this range
with the AC input voltage. The output voltage is then equal to the input voltage.
Adjustability:
Lower limit: 180 - 230V
Upper limit: 230 - 270V
Inverter voltage
Output voltage of the MultiPlus in battery operation.
Adjustability: 210 – 245V
Stand-alone / parallel operation / 2-3 phase setting
Using several devices, it is possible to:
increase total inverter power (several devices in parallel)
create a split-phase system
create a 3-phase system.
The standard product settings are for standalone operation. For parallel, three phase or split
phase operation see section 4.4.5 and 4.4.6.
Search mode
If search mode is ‘on’, the power consumption in no-load operation is decreased by approx.
70%. In this mode the MultiPlus, when operating in inverter mode, is switched off in case of no
load or very low load, and switches on every two seconds for a short period. If the output
current exceeds a set level, the inverter will continue to operate. If not, the inverter will shut
down again.
Search Mode can be set with a DIP switch.
Search Mode ‘shut down’ and ‘remain on’ load levels can be set with VEConfigure.
The standard settings are:
Shut down: 30 Watt (linear load)
Turn on: 60 Watt (linear load)
AES (Automatic Economy Switch)
Instead of the search mode, the AES mode can also be chosen (with help of VEConfigure
only).

14
If this setting is turned ‘on’, the power consumption in no-load operation and with low loads is
decreased by approx. 20%, by slightly 'narrowing' the sinusoidal voltage.
Ground relay (see appendix B)
With this relay (H), the neutral conductor of the AC output is grounded to the chassis when the
back feed safety relay is open. This ensures the correct operation of earth leakage circuit
breakers in the output.
If a non-grounded output is required during inverter operation, this function must be turned off.
(Use VE-Configure)
The standard setting is ‘Four-stage adaptive with BatterySafe mode’. See Section 2 for a
description.
This is the recommended charge curve. See the help files in the software configuration
programs for other features.
Battery type
The standard setting is the most suitable for Victron Gel Deep Discharge, Gel Exide A200,
and tubular plate stationary batteries (OPzS). This setting can also be used for many other
batteries: e.g. Victron AGM Deep Discharge and other AGM batteries, and many types of flat-
plate flooded batteries. Four charging voltages can be set with DIP switches.
Automatic equalisation charging
This setting is intended for tubular plate traction batteries. During absorption the voltage limit
increases to 2,83V/cell (34V for a 24V battery) once the charge current has tapered down to
less than 10% of the set maximum current.
Absorption time
The absortion time depends on the bulk time (adaptive charge curve), so that the battery is
optimally charged. If the ‘fixed’ charging characteristic is selected, the absorption time is fixed.
For most batteries, a maximum absorption time of eight hours is suitable. If an extra high
absorption voltage is selected for rapid charging (only possible for open, flooded batteries!),
four hours is preferable. With DIP switches, a time of eight or four hours can be set. For the
adaptive charge curve, this determines the maximum absorption time.
Storage voltage, Repeated Absorption Time, Absorption Repeat Interval
See Section 2.
Bulk Protection
Default setting: off. When this setting is ‘on’, the bulk charging time is limited to 10 hours. A
longer charging time could indicate a system error (e.g. a battery cell short-circuit).
AC input current limit
These are the current limit settings at which PowerControl come into operation. The factory
setting is 12A.
UPS feature
If this setting is ‘on’ and AC on the input fails, the MultiPlus switches to inverter operation
practically without interruption. The MultiPlus can therefore be used as an Uninterruptible
Power Supply (UPS) for sensitive equipment such as computers or communication systems.
The output voltage of some small generator sets is too unstable and distorted for using this
setting* – the MultiPlus would continually switch to inverter operation. For this reason, the
setting can be turned off. The MultiPlus will then respond less quickly to AC input voltage

15
EN NL FR DE ES Appendix
deviations. The switchover time to inverter operation is consequently slightly longer, but
most equipment (most computers, clocks or household equipment) is not adversely
impacted.
Recommendation: Turn the UPS feature off if the MultiPlus fails to synchronise, or
continually switches back to inverter operation.
*In general, the UPS setting can be left ‘on’ if the MultiPlus is connected to a generator
with a ‘synchronous AVR regulated alternator’.
The UPS mode may have to be set to ‘off’ if the MultiPlus is connected to a generator with
a ‘synchronous capacitor regulated alternator’ or an asynchronous alternator.
Dynamic current limiter
Intended for generators, the AC voltage being generated by means of a static inverter
(so-called ‘inverter’ generators). In these generators, rpm is down-controlled if the load is
low: this reduces noise, fuel consumption and pollution. A disadvantage is that the output
voltage will drop severely or even completely fail in the event of a sudden load increase.
More load can only be supplied after the engine is up to speed.
If this setting is ‘on’, the MultiPlus will reduce charge current until the set current limit is
reached. This allows the generator engine to get up to speed.
This setting is also often used for ‘classic’ generators that respond slowly to sudden load
variation.
WeakAC
Strong distortion of the input voltage can result in the charger hardly operating or not
operating at all. If WeakAC is set, the charger will also accept a strongly distorted voltage,
at the cost of greater distortion of the input current.
Recommendation: Turn WeakAC on if the charger is hardly charging or not charging at all
(which is quite rare!). Also turn on the dynamic current limiter simultaneously and reduce the
maximum charging current to prevent overloading the generator if necessary.
BoostFactor
Change this setting only after consulting with Victron Energy or with an engineer trained by
Victron Energy!
Programmable relay
By default, the programmable relay is set as an alarm relay, i.e. the relay will de-energise in
the event of an alarm or a pre-alarm (inverter almost too hot, ripple on the input almost too
high, battery voltage almost too low).
VEConfigure software
With VEConfigure software the relay can also be programmed for other purposes, for example
to provide a generator starting signal.

16
5.3 Configuration by computer
All settings can be changed by means of a computer.
Some settings can be changed with DIP switches (see Section 5.2).
For changing settings with the computer, the following is required:
- VEConfigure3 software: can be downloaded free of charge at www.victronenergy.com.
- A MK3-USB (VE.Bus to USB) interface, and a RJ45 UTP cable.
Alternatively, the Interface MK2.2b (VE.Bus to RS232) and a RJ45 UTP cable can be used.
5.4 Configuration with DIP switches
Some settings can be changed with DIP switches.
Procedure:
a) Turn the MultiPlus on, preferably without load and without AC voltage on the input. The
MultiPlus will then operate in inverter mode.
b) Set the DIP switches as required.
c) Store the settings by moving DIP switch 6 to ‘on’ and back to ‘off’.
5.4.1. DIP switch 1
Default setting: to operate the product with the ‘On/Off/Charger Only’ switch
ds 1: ‘off’
Setting for operation with a 3 position remote switch or the Digital Multi Control panel:
ds 1: ‘on’
The 3 position switch must be wired to terminal L, see appendix A.
Only one remote control can be connected, i.e. either a switch or a Digital Multi Control
panel.

17
EN NL FR DE ES Appendix
5.4.2. DIP switch 2 to 6
These DIP switches can be used to set:
- Battery charge voltage and Absorption time
- Inverter frequency
- Search mode
Ds2-ds3: Setting the charge algorithm
ds2-ds3 Absorption
voltage Float voltage Storage Voltage
Absorption
Time
(hours)
Suitable for
ds2=off
ds3=off
(default)
14.4
28.8
57.6
13.8
27.6
55.2
13.2
26.4
52.8 8
Gel Victron Deep
Discharge
Gel Exide A200
AGM Victron Deep
Discharge
ds2=off
ds3=on
14.1
28.2
56.4
13.8
27.6
55.2
13.2
26.4
52.8 8
Gel Victron Long
Life (OPzV)
Gel Exide A600
(OPzV)
Gel MK battery
Li-ion (LiFePO4)
ds2=on
ds3=off
14.7
29.4
58.8
13.8
27.6
55.2
13.2
26.4
52.8 5
AGM Victron Deep
Discharge
Tubular plate or
OPzS batteries in
semi-float mode
AGM spiral cell
ds2=on
ds3=on
15.0
30.0
60.0
13.8
27.6
55.2
13.2
26.4
52.8 6 Tubular plate or
OPzS batteries in
cyclic mode
Ds4: Inverter frequency off = 50Hz on = 60Hz
Ds5: Search Mode off = off on = on
Store the settings by moving DIP switch6to ‘on’ and back to ‘off’.

18
5.4.3 Exemplary settings
Example 1 is the factory setting (since factory settings are entered by computer, all DIP
switches of a new product are set to ‘off’).
DS-1 3 position switch
off
DS-2 Charge voltage
off
DS-3 Charge voltage
off
DS-4 Frequency
off
DS-5 Search mode
off
DS-6 Store setting
→
←
DS-1
off
DS-2
on
DS-3
off
DS-4
off
DS-5
off
DS-6
→
←
DS-1
on
DS-2
on
DS-3
on
DS-4
on
DS-5
on
DS-6
→
←
Example 1: (factory setting)
1 No 3 position
switch connected
2, 3 GEL 14.4 V
4 Frequency: 50Hz
5 Search mode off
6 Store setting: off→ on→ off
Example 2
1 No 3 position
switch connected
2,3 AGM 14,7V
4 Frequency: 50Hz
5 Search mode off
6 Store setting: off→ on→ off
Example 3
1 3 position
switch connected
2, 3 Tubular plate 15V
4 Frequency: 60Hz
5 Search mode on
6 Store setting: off→ on→ off
Store the settings by changing switch ds-6 from off to on, and then back to off.
The LEDs ‘charger’ and ‘alarm’ will flash to indicate acceptance of the settings.
6. MAINTENANCE
The MultiPlus does not require specific maintenance. It will suffice to check all connections
once a year. Avoid moisture and oil/soot/vapours, and keep the device clean.

19
EN NL FR DE ES Appendix
7. TROUBLE SHOOTING TABLE
Proceed as follows for quick detection of common faults.
DC loads must be disconnected from the batteries and the AC loads must be
disconnected from the inverter before the inverter and/or battery charger is tested.
Consult your Victron Energy dealer if the fault cannot be resolved.
Problem
Cause
Solution
The inverter fails
to operate when
switched on
The battery voltage is too high
or too low
Ensure that the battery voltage
is within the correct value.
The inverter fails
to operate
Processor in no function-mode
Disconnect mains voltage.
Switch front switch off, wait 4
seconds.
Switch front switch on.
The alarm LED
flashes
Pre-alarm alt. 1. The DC input
voltage is low
Charge the battery or check the
battery connections.
The alarm LED
flashes
Pre-alarm alt. 2. The ambient
temperature is too high
Place the inverter in a cool and
well-ventilated room, or reduce
the load.
The alarm LED
flashes
Pre-alarm alt. 3. The load on the
inverter is higher than the
nominal load
Reduce the load.
The alarm LED
flashes
Pre-alarm alt. 4. Voltage ripple
on the DC input exceeds
1.25Vrms
Check the battery cables and
terminals.
Check the battery capacity;
increase if necessary.
The alarm LED
flashes
intermittantly
Pre-alarm alt. 5. Low battery
voltage and excessive load
Charge the batteries, reduce
the load or install batteries with
a higher capacity. Use shorter
and/or thicker battery cables.
The alarm LED is
on
The inverter did cut out following
a pre-alarm
Check the table for the
appropriate course of action.

20
Problem
Cause
Solution
The charger is not
functioning
The AC input voltage or frequency
is out of range
Ensure that the input voltage is
between 185Vac and 265Vac,
and that the frequency matches
the setting.
The battery is not
being charged fully
Incorrect charging current
Set the charging current at
between 0.1 and 0.2x battery
capacity.
A defective battery connection
Check the battery terminals.
The absorption voltage has been
set to an incorrect value
Adjust the absorption voltage to
the correct value.
The float voltage has been set to
an incorrect value
Adjust the float voltage to the
correct value.
The internal DC fuse is defective
Inverter is damaged.
The battery is
overcharged
The absorption voltage has been
set to an incorrect value
Adjust the absorption voltage to
the correct value.
The float voltage has been set to
an incorrect value
Adjust the float voltage to the
correct value.
A defective battery
Replace the battery.
The battery is too small
Reduce the charging current or
use a battery with a higher
capacity.
The battery is too hot
Connect a temperature sensor.
Battery charge
current drops to 0
when the absorption
voltage is reached
Alt. 1: Battery overtemperature
(> 50°C)
- Allow battery to cool down
- Place battery in a cool
environment
- Check for shorted cells
Alt 2: Battery temperature sensor
faulty
Unplug battery temperature
sensor from the MultiPlus.
Reset the MultiPlus by switching
it off, then wait for 4 seconds and
switch it on again.
If the MultiPlus now charges
normally, the battery temperature
sensor is faulty and needs to be
replaced.