Victron energy MultiPlus Compact 12/2000/80-30 230V User manual

Manual
EN
Handleiding
NL
Manue
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FR
Anleitung
DE
Manual
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Appendix
MultiPlus Compact
12 | 2000 | 80-30 230V
24 | 2000 | 50-30 230V

1
EN NL FR DE ES Appendix
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 and fitted with circuit breakers. Never
replace a safety component with a different Typ. Consult the manual to determine the correct
component.
Before applying power, ensure that the available power source matches the configuration
settings of the product as described in the manual.

2
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.
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 -20°C and
60°C.
Consult the battery manufacturer's manual in respect of transport, storage, charging,
recharging and disposal of the battery.

3
EN NL FR DE ES Appendix
2. DESCRIPTION
2.1 General
Multi Compact -functional
The MultiPlus Compact 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
compact enclosure. Beside these primary functions, however, the MultiPlus
Compact 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 Multi Compact 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.
PowerControl – Dealing with limited generator or shore side power
With a Phoenix Multi Control Panel a maximum generator or shore current can be
set. The Multi Compact 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.
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.
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.

4
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 4A 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 our website.
2.3 Self consumption – solar energy storage systems
When the Multi/Quattro is used in a configuration in which it will feed back energy to the grid
it is required to enable grid code compliance by selecting the grid code country setting with
the VEConfigure tool.
This way the Multi/Quattro can comply to the local rules.
Once set, a password will be required to disable grid code compliance or change grid code
related parameters.
If the local grid code is not supported by the Multi/Quattro an external certified interface
device should be used to connect the Multi/Quattro to the grid.
Special note for Australian customers: IEC62109.1 certification and CEC approval for off-grid
use does NOT imply approval for grid-interactive installations. Additional certification to IEC
62109.2 and AS 4777.2.2015 are required before grid-interactive systems can be
implemented. Please check Clean Energy Council website for current approvals.

5
EN NL FR DE ES Appendix
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 "mains
on" LED will light up and the charger commences charging. The "bulk",
"absorption" or "float" LEDs will light up, depending on the charger mode.
If the voltage at the "AC-in" terminal is not within specifacations, the inverter will
switch on.
When the switch is switched to "charger only", only the battery charger of the
Phoenix Multi will operate (if mains voltage is present). In this mode input voltage
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 your batteries from running flat.
3.2 Remote control
Remote control is possible with a 3-way 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 and PowerAssist in Section 2.
For the appropriate DIP switch settings, see sect. 5.5.1.
3.3 Equalisation and forced absorption
3.3.1 Equalisation
Traction batteries may require regular equalisation charging. In the equalisation mode,
the MultiPlus will charge with increased voltage for one hour (1V above the absorption
voltage for a 12V battery, 2V for a 24V battery). The charging current is then limited to
1/4 of the set value. The “bulk” and “absorption” LEDs flash intermittently.
Equalisation mode supplies a higher charging voltage than most DC
consuming devices can cope with. These devices must be disconnected
before additional charging takes place.
3.3.2 Forced absorption
Under certain circumstances, it can be desirable to charge the battery for a fixed time
at absorption voltage level. In Forced Absorption mode, the MultiPlus will charge at the
normal absorption voltage level during the set maximum absorption time. The “absorption”
LED will be ‘on’.

6
3.3.3 Activating equalisation or forced absorption
The MultiPlus can be put into both these states from the remote panel as well as with the
front panel switch, provided that all switches (front, remote and panel) are set to “on” and no
switches are set to “charger only”.
In order to put the MultiPlus in this state, the procedure below should be followed.
If the switch is not in the required position after following this procedure, it can be switched
over quickly once. This will not change the charging state.
NOTE: Switching from “on” to “charger only” and vice versa, as described below, must be done quickly.
The switch must be toggled such that the intermediate position is 'skipped', as it were. If the switch
remains in the “off” position even for a short time, the device may be turned off. In that case, the
procedure must be restarted at step 1. A certain degree of familiarisation is required when using the front
switch on the Compact in particular. When using the remote panel, this is less critical.
Procedure:
1. Check whether all switches (i.e. front switch, remote switch or remote panel switch if present)
are in the “on” position.
2. Activating equalisation or forced absorption is only meaningful if the normal charging cycle is
completed (charger is in 'Float').
3. To activate:
a. Switch rapidly from “on” to “charger only” and leave the switch in this position for ½ to 2
seconds.
b. Switch rapidly back from “charger only” to “on” and leave the switch in this position for ½ to
2 seconds.
c. Switch once more rapidly from “on” to “charger only” and leave the switch in this position.
4. On the MultiPlus the three LEDs “Inverter”, “Charger” and “Alarm” will now flash 5 times.
If a MultiControl panel is connected, on the panel the LEDs “bulk”, “absorption” and “float” will
also flash 5 times.
5. Subsequently, on the MultiPlus the LEDs “Bulk”, “Absorption” and “Float” will each light during
2 seconds.
If a MultiControl panel is connected, on the panel the LEDs “bulk”, “absorption” and “float” will
also each light during 2 seconds.
6. a. If the switch on the MultiPlus is set to “on” while the “Bulk” LED lights, the charger will switch
to equalisation.
Similarly, if the switch on the MultiControl panel is set to “on” while the “Bulk” LED lights, the
charger will switch to equalisation.
b. If the switch on the MultiPlus is set to “on” while the “Absorption” LED lights, the charger will
switch to forced absorption.
Similarly, if the switch on the MultiControl panel is set to “on” while the “Absorption” LED lights,
the charger will switch to forced absorption.
c. If the switch on the MultiPlus is set to “on” after the three LED sequence has finished, the
charger will switch to “Float”.
Similarly, if the switch on the MultiControl panel is set to “on” after the three LED sequence
has finished, the charger will switch to “float”.
d. If the switch is has not been moved, the MultiPlus will remain in ‘charger only’ mode and
switch to “Float”.

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EN NL FR DE ES Appendix
3.4 LED Indications
LED off
LED flashes
LED illuminated
Inverter
The inverter is switched on and
supplies power to the load. Battery
operation.
inverter
on
charger
off
alarm
charger only
The inverter is switched on and supplies
power to the load.
Pre alarm: overload, or
battery voltage low, or
inverter temperature high
inverter
on
charger
off
alarm
charger only
The inverter is switched off.
Alarm: overload, or
battery voltage low, or
inverter temperature hig, or
DC ripple voltage on battery
terminal was too high.
inverter
on
charger
off
alarm
charger only
Charger
The AC input voltage is switched through
and the charger operates in bulk or
absorption mode.
inverter
on
charger
off
alarm
charger only

8
The AC input voltage is switched through
and the charger is switched off.
The battery charger can not reach battery
end voltage (bulk protection mode).
inverter
on
charger
off
alarm
charger only
The AC input voltage is switched through
and the charger operates in bulk or
absorption mode.
inverter
on
charger
off
alarm
charger only
The AC input voltage is switched through
and the charger operates in float mode.
inverter
on
charger
off
alarm
charger only
Remote Control panel (optional)
Power Control and PowerAssist indication
inverter on
mains on
overload
bulk
low battery
absorption
temperature
float
on
charger only
off
Note: When the LED’s “overload” and “low battery” are on simultaneously, the Multi(Plus) or
Inverter Compact has switched off due to excessive DC ripple voltage.

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EN NL FR DE ES Appendix
4. INSTALLATION
This product should be installed by a qualified electrician.
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.
Excessively high ambient temperature will result in the following:
Reduced service life.
Reduced charging current.
Reduced peak capacity, or shutdown of the inverter.
Never mount the appliance directly above the batteries.
The product is suitable for wall mounting. For mounting see appendix A.
The appliance can be mounted horizontally as well as vertically; vertical mounting
is preferable. The vertical position offers optimum cooling.
The interior of the product must remain accessible after installation.
Try and keep the distance between the product and the battery to a minimum in
order to minimize cable voltage losses.
For safety purposes, this product should be installed in a heat-resistant
environment if it is used with equipment where a substantial amount of
power is to be converted. You should prevent the presence of e.g.
chemicals, synthetic components, curtains or other textiles, etc., in the
immediate vicinity.

10
4.2 Connection of 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.
12/2000/80-50
24/2000/50-50
Recommended battery capacity
(Ah)
350–1000 200–500
Recommended DC fuse
300A
200A
Recommended cross section (mm2)
per + and - connection terminal
0 – 5m
70mm2
35mm2
Remark: Internal resistance is the important factor when working with low capacity batteries.
Please consult your supplier or the relevant sections of our book “electricity on board”,
downloadable from our website.
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 the battery cables: the + (red) on the left and the - (black) on the right, to the battery
see appendix A.
Reverse polarity connection (+ to – and – to +) will cause damage to the product. (Safety
fuse inside the Multi Compact can be damaged)
Secure the nuts tightly in order to reduce the contact resistance as much as possible.

11
EN NL FR DE ES Appendix
4.3 Connection of the AC cabling
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.
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, an 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 (for example, with a shore current plug),
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 Multi
Compact, see appendix A.
AC-in
The AC input must be protected by a fuse or magnetic circuit breaker rated
at 30A or less, and cable cross-section must be sized accordingly. If the input
AC supply is rated at a lower value, the fuse or magnetic circuit breaker should be
down sized accordingly.
AC-out
With its PowerAssist feature the Multi can add up to 2kVA (that is 2000 / 230 = 9A)
to the output during periods of peak power requirement. Together with a maximum
input current of 30A this means that the output can supply up to 30 + 9 = 39A.
An earth leakage circuit breaker and a fuse or circuit breaker rated to support
the expected load must be included in series with the output, and cable cross-section
must be sized accordingly. The maximum rating of the fuse or circuit
breaker is 40A.

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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 Compact 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 batteries minus
pole. Default output voltages for Float and Absorption are at 25°C. In adjust mode
temperature compensation is disabled.
10.0
10.5
11.0
11.5
12.0
12.5
13.0
13.5
14.0
14.5
15.0
0 5 10 15 20 25 30 35 40 45 50 55 60
Battery temperature
Volts
20
21
22
23
24
25
26
27
28
29
30
Volts
4.4.3 Remote Control panel & remote on/off switch
The product can be remotely controlled in two ways:
- With an external 3-way 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 however, for
example to start a generator (VEConfigure software needed).
Near the connection terminals an LED illuminates when the relay is activated (refer to S, see
appendix A).

13
EN NL FR DE ES Appendix
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 Multis 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.
•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.
4.4.6 Three-phase operation
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 (Multis 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.

14
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 curve 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 / 28.8v
Absorption time up to 8 hours (depending on bulk time)
Float voltage 13.8 / 27.6V
Storage voltage 13.2 / 26.4V (not adjustable)
Repeated absorption time 1 hour
Absorption repeat interval 7 days
Bulk protection on
AC input current limit 16A (= adjustable current limit for PowerControl and
PowerAssist functions)
UPS feature on
Dynamic current limiter off
WeakAC off
BoostFactor 2
Multi-functional relay alarm function
PowerAssist on

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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 – 65 Hz; 45 – 55 Hz; 55 – 65 Hz
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 4.6.6 and 4.6.7.
Search Mode (Applicable in stand-alone configuration only)
If search mode is ‘on’, the power consumption in no-load operation is decreased by
approx. 70%. In this mode the Compact, 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.
The Search Mode can be set with a DIP switch.
The Search Mode “shut down” and “remain on” load levels can be set with VEConfigure.
The standard settings are:
Shut down: 40 Watt (linear load)
Turn on: 100 Watt (linear load)

16
AES (Automatic Economy Switch)
Instead of the search mode, the AES can also be chosen (with help of VEConfigure only).
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. Not adjustable with
DIP switches. Applicable in stand-alone configuration only.
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.
Not adjustable with DIP switches.
Battery charge curve
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 open 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.
Not adjustable with DIP switches.
See ’tubular plate traction battery charge curve’ in VEConfigure.
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. Not adjustable with DIP switches.

17
EN NL FR DE ES Appendix
Bulk Protection
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). Not
adjustable with DIP switches.
AC input current limit
These are the current limit settings at which PowerControl and PowerAssist come
into operation. The factory setting is 16A.
See Section 2, the book 'Energy Unlimited', or the many descriptions of this
unique feature on our website www.victronenergy.com .
Remark: lowest allowable current setting for PowerAssist: 2,7A.
(2,7A per unit in case of parallel operation)
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 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 start supplying extra power at a low generator
output level and gradually allow the generator to supply more, 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.

18
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.
Not adjustable with DIP switches.
BoostFactor
Change this setting only after consulting with Victron Energy or with an engineer trained by
Victron Energy!
Not adjustable with DIP switches.
Programmable relay
By default, the multi-functional 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).
Not adjustable with DIP switches.
Near the connection terminals an LED illuminates when the relay is activated (refer to S, see
appendix A).