MultiPlus-II 12V/24V/48V 3kVA
120V
Rev 00 10/2021
ENGLISH
Table of Contents
1. IMPORTANT SAFETY INSTRUCTIONS - Save these instructions! .......................................................... 1
2. Description ............................................................................................................................ 2
2.1. Boats, vehicles and other stand-alone applications ..................................................................... 2
2.2. On-grid and off-grid systems combined with PV ......................................................................... 2
2.3. Battery charger .............................................................................................................. 3
2.3.1. Lead-acid batteries ................................................................................................ 3
2.3.2. Li-ion batteries ..................................................................................................... 3
2.3.3. Other Li-ion batteries ............................................................................................. 3
2.3.4. More on batteries and battery charging ......................................................................... 4
2.4. ESS – Energy Storage Systems: feeding energy back into the grid (not applicable to the MultiPlus-II
12/3000/120-32) .................................................................................................................. 4
3. Operation .............................................................................................................................. 5
3.1. On/Off/Charger Only Switch ................................................................................................ 5
3.2. Remote control .............................................................................................................. 5
3.3. Equalisation and forced absorption ........................................................................................ 5
3.3.1. Equalisation ........................................................................................................ 5
3.3.2. Forced absorption ................................................................................................. 5
3.3.3. Activating equalisation or forced absorption ................................................................... 5
3.4. LED Indications .............................................................................................................. 6
4. Installation ........................................................................................................................... 10
4.1. Location .................................................................................................................... 10
4.2. Connection of battery cables ............................................................................................. 11
4.3. Connection of the AC cabling ............................................................................................ 12
4.4. Optional Connections ..................................................................................................... 13
4.4.1. Remote Control .................................................................................................. 13
4.4.2. Programmable relay ............................................................................................ 13
4.4.3. Programmable analog/digital input/output ports ............................................................. 13
4.4.4. Voltage sense (connection terminal J, see appendix A) .................................................... 14
4.4.5. Temperature sensor (connection terminal J, see appendix A) ............................................. 14
4.4.6. Parallel Connection ............................................................................................. 14
4.4.7. Split-phase and three-phase operation ....................................................................... 14
5. Configuration ....................................................................................................................... 15
5.1. Standard settings: ready for use ......................................................................................... 15
5.2. Explanation of settings .................................................................................................... 15
5.3. Configuring the MultiPlus-II ............................................................................................... 18
5.3.1. VE.Bus Quick Configure Setup ................................................................................ 18
5.3.2. VE.Bus System Configurator .................................................................................. 18
5.3.3. VEConfigure ..................................................................................................... 18
5.3.4. VictronConnect .................................................................................................. 18
6. Maintenance ......................................................................................................................... 19
7. Error Indications ................................................................................................................... 20
7.1. General error indications ................................................................................................. 20
7.2. Special LED indications ................................................................................................... 21
7.3. VE.Bus LED indications .................................................................................................. 22
7.3.1. VE.Bus OK codes ............................................................................................... 22
7.3.2. VE.Bus error codes ............................................................................................. 22
8. Technical Specifications .......................................................................................................... 25
A. APPENDIX A: Connection overview ............................................................................................ 27
B. APPENDIX B: Block diagram .................................................................................................... 29
MultiPlus-II 12V/24V/48V 3kVA 120V
C. APPENDIX C: Parallel connection .............................................................................................. 30
D. APPENDIX D: Three phase connection ........................................................................................ 31
E. APPENDIX E: Charge algorithm ................................................................................................. 32
F. APPENDIX F: Temperature compensation ..................................................................................... 33
G. APPENDIX G: Dimensions ....................................................................................................... 34
MultiPlus-II 12V/24V/48V 3kVA 120V
1. IMPORTANT SAFETY INSTRUCTIONS - Save these instructions!
In general
Please read the documentation supplied with this product first, so that you are familiar with the safety signs en directions before
using the product.
This product is designed and tested in accordance with international standards. The equipment should be used for the designated
application only.
Warning – These servicing instructions are for use by qualified personnel only. To reduce the risk of
electric shock, do not perform any servicing other than that specified in the operating instructions
unless you are qualified to do so
The product is used in combination with a permanent energy source (battery). Even if the equipment is
switched off, a dangerous electrical voltage can occur at the input and/or output terminals. Always switch the
AC power off and disconnect the battery before performing maintenance.
The product contains no internal user-serviceable parts. Do not remove the front panel and do not put the product into operation
unless all panels are fitted. All maintenance should be performed by qualified personnel.
Never use the product at sites where gas or dust explosions could occur. Refer to the specifications provided by the manufacturer
of the battery to ensure that the battery is suitable for use with this product. The battery manufacturer's safety instructions should
always be observed.
This appliance is not intended for use by persons (including children) with reduced physical, sensory or mental capabilities, or
lack of experience and knowledge unless they have been given supervision or instruction concerning the use of the appliance by
a person responsible for their safety. Children should be supervised to ensure that they do not play with the appliance.
do not lift heavy objects unassisted.
Installation
Read the installation instructions before commencing installation activities. For electrical work, follow the local national wiring
standard, regulation, and this installation instructions. The installation shall be in accordance with the Canadian Electrical Code,
Part 1. The wiring methods shall be in accordance with the National Electrical Code, ANSI/NFPA 70.
This product is a safety class I device (supplied with a ground terminal for safety purposes). Its AC input and/or output
terminals must be provided with uninterruptible grounding for safety purposes. An additional grounding point is located
on the outside of the product. The ground conductor should be at least 4mm². If it can be assumed that the grounding
protection is damaged, the product should be taken out of operation and prevented from accidentally being put into operation
again; contact qualified maintenance personnel.
Ensure that the connection cables are provided with fuses and circuit breakers. Never replace a protective device by a
component of a different type. Refer to the manual for the correct part.
Do not invert neutral and phase when connecting the AC.
Check before switching the device on whether the available voltage source conforms to the configuration settings of the product
as described in the manual.
Ensure that the equipment is used under the correct operating conditions. Never operate it in a wet or dusty environment. Ensure
that there is always sufficient free space around the product for ventilation, and those ventilation openings are not blocked. Install
the product in a heatproof environment. Ensure therefore that there are no chemicals, plastic parts, curtains or other textiles, etc.
in the immediate vicinity of the equipment.
This inverter is provided with an internal isolation transformer providing reinforced insulation
Transport and storage
On storage or transport of the product, ensure that the mains supply and battery leads are disconnected.
No liability can be accepted for damage in transit if the equipment is not transported in its original packaging.
Store the product in a dry environment; the storage temperature should range from –20°C to 60°C.
Refer to the battery manufacturer's manual for information on transport, storage, charging, recharging, and disposal of the battery.
MultiPlus-II 12V/24V/48V 3kVA 120V
Page 1
IMPORTANT SAFETY INSTRUCTIONS -
Save these instructions!
2. Description
2.1. Boats, vehicles and other stand-alone applications
The basis of the MultiPlus-II is an extremely powerful sine inverter, battery charger and transfer switch in a compact casing.
Important features:
Automatic and uninterruptible switching
In the event of a supply failure or when the generating set is switched off, the MultiPlus-II will switch over to inverter operation and
take over the supply of the connected devices. This is done so quickly that operation of computers and other electronic devices is
not disturbed (Uninterruptible Power Supply or UPS functionality). This makes the MultiPlus-II highly suitable as an emergency
power system in industrial and telecommunication applications.
Two AC outputs
Besides the usual uninterruptable output (AC-out-1), an auxiliary output (AC-out-2) is available that disconnects its load in the
event of battery operation. Example: an electric boiler that is allowed to operate only if the genset is running or shore power is
available. There are several applications for AC-out-2.
Please enter “AC-out-2” in the search box on our website and find the latest information about other applications.
Three phase capability
Three units can be configured for three-phase output. Up to 6 sets of three units can be parallel connected.
PowerControl – maximum use of limited AC power
The MultiPlus-II can supply a huge charging current. This implies heavy loading of the AC mains or generator. Therefore a
maximum current can be set. The MultiPlus-II then takes other power users into account, and only uses “surplus' current for
charging purposes.
PowerAssist – Extended use of generator or shore current: the MultiPlus-II “co-supply” feature
This feature takes the principle of PowerControl to a further dimension allowing the MultiPlus-II to supplement the capacity of the
alternative source. Where peak power is often required only for a limited period, the MultiPlus-II will make sure that insufficient AC
mains or generator power is immediately compensated for by power from the battery. When the load reduces, the spare power is
used to recharge the battery.
Programmable relay
The MultiPlus-II is equipped with a programmable relay. The relay can be programmed for different applications, for example as a
starter relay for a generator.
External current transformer (optional)
External current transformer option to implement PowerControl and PowerAssist with external current sensing.
Programmable analog/digital input/output ports (Aux in 1 and Aux in 2, see appendix)
The MultiPlus-II is equipped with 2 analog/digital input/output ports.
These ports can be used for several purposes. One application is communication with the BMS of a lithium-ion battery.
2.2. On-grid and off-grid systems combined with PV
External current transformer (optional)
When used in a grid-parallel topology the internal current transformer cannot measure the current to or from the mains. In this
case an external current transformer has to be used. See appendix.
Frequency shift
When solar inverters are connected to the output of a MultiPlus-II, excess solar energy is used to recharge the batteries. Once
the absorption voltage is reached, charge current will reduce and excess energy will be fed back into the mains. If the mains is
not available, the MultiPlus-II will slightly increase the AC frequency to reduce the output of the solar inverter.
Built-in Battery Monitor
The ideal solution when the MultiPlus-II is part of a hybrid system (diesel generator, inverter/chargers, storage battery, and
alternative energy). The built-in battery monitor can be set to start and stop the generator:
- Start at a preset % discharge level, and/or
- start (with a preset delay) at a preset battery voltage, and/or
- start (with a preset delay) at a preset load level.
MultiPlus-II 12V/24V/48V 3kVA 120V
Page 2 Description
- Stop at a preset battery voltage, or
- stop (with a preset delay) after the bulk charge phase has been completed, and/or
- stop (with a preset delay) at a preset load level.
Autonomous operation when the grid fails
Houses or buildings with solar panels or a combined micro-scale heating and power plant or other sustainable energy sources
have a potential autonomous energy supply which can be used for powering essential equipment (central heating pumps,
refrigerators, deep freeze units, Internet connections, etc.) during a power failure. A problem is however that grid connected
sustainable energy sources drop out as soon as the grid fails. With a MultiPlus-II and batteries, this problem can be solved: the
MultiPlus-II can replace the grid during a power failure. When the sustainable energy sources produce more power than
needed, the MultiPlus-II will use the surplus to charge the batteries; in the event of a shortfall, the MultiPlus-II will supply
additional power from the battery.
Programmable
All settings can be changed with a PC and free of charge software, downloadable from our website www.victronenergy.com
2.3. Battery charger
2.3.1. Lead-acid batteries
Adaptive 4-stage charge algorithm: 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.
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.
Battery voltage sense: the correct charge voltage
Voltage loss due to cable resistance can be compensated by using the voltage sense facility to measure voltage directly on the
DC bus or on the battery terminals.
Battery voltage and 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.
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 (12V and 24V models only).
2.3.2. Li-ion batteries
Victron LiFePO4 Smart batteries
Use the VE.Bus BMS
2.3.3. Other Li-ion batteries
Please see https://www.victronenergy.com/live/battery_compatibility:start
MultiPlus-II 12V/24V/48V 3kVA 120V
Page 3 Description
2.3.4. More on batteries and battery 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 → Technical Information). For more information on adaptive
charging, please also refer to the Technical Information on our website.
2.4. ESS – Energy Storage Systems: feeding energy back into the grid (not
applicable to the MultiPlus-II 12/3000/120-32)
When the MultiPlus-II is used in a configuration in which it will feed back energy into the grid it is required to enable grid code
compliance by selecting the appropriate grid code country setting with the VEConfigure tool.
Once set, a password will be required to disable grid code compliance or change grid code related parameters.
Depending on the grid code there are several reactive Power control modes:
Fixed cos φ
Cos φ as function of P
Fixed Q
Q as function of input voltage
Reactive Power capability
If the local grid code is not supported by the MultiPlus-II an external certified interface device should be used to connect the
MultiPlus-II to the grid.
The MultiPlus-II can also be used as a bidirectional inverter operating parallel to the grid, integrated into a customer designed
system (PLC or other) that takes care of the control-loop and grid measurement.
MultiPlus-II 12V/24V/48V 3kVA 120V
Page 4 Description
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 rejected, the inverter will switch on.
When the switch is switched to ‘charger only’, only the battery charger of the 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 either a switch or with a Multi Control panel.
The Multi Control panel has a simple rotary knob with which the maximum current of the L1 AC input can be set. This does not
affect L2 AC input: see PowerControl and PowerAssist in Section 2.
3.3. Equalisation and forced absorption
3.3.1. Equalisation
Traction batteries require regular additional charging. In the equalisation mode, the MultiPlus-II 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 the absorption voltage level. In Forced
Absorption mode, the MultiPlus-II will charge at the normal absorption voltage level during the set maximum absorption time. The
‘absorption’ LED lights.
3.3.3. Activating equalisation or forced absorption
The MultiPlus-II 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-II 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.
Switching from ‘on’ to ‘charger only’ and back, 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
MultiPlus-II 12V/24V/48V 3kVA 120V
Page 5 Operation
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-II (and, if connected, on the MultiControl panel) the three LEDs ‘Bulk’, ‘Absorption’ and ‘Float’ will now flash
5 times.
5. Subsequently, the LEDs ‘Bulk’, ‘Absorption’ and ‘Float’ will each light during 2 seconds.
a. If the switch is set to ‘on’ while the ‘Bulk’ LED lights, the charger will switch to equalisation.
b. If the switch is set to ‘on’ while the ‘Absorption’ LED lights, the charger will switch to forced absorption.
c. If the switch 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-II will remain in ‘charger only’ mode and switch to ‘Float’.
3.4. LED Indications
LEDs off
LEDs blinking
LEDs illuminated
Inverterting
The inverter is on. Inverter power is supplied to the load. The
"inverter" LED is on.
Overload pre-alarm
The nominal output of the inverter is exceeded. The "overload"
LED is blinking
Overload alarm
The inverter is switched off due to overload or short circuit. The
"overload" LED is on.
Low battery pre-alarm
The battery voltage is getting low. The battery is almost fully
exhausted. The "low battery"LED is blinking.
MultiPlus-II 12V/24V/48V 3kVA 120V
Page 6 Operation
Low battery alarm
The inverter has switched off due to low battery voltage. The "low
battery" LED is blinking.
Temperature pre-alarm
The internal temperature is reaching a critical level. The
"temperature" LED is blinking.
Temperature alarm
The inverter has switched off due it's internal temperature being too
high. The "temperature" LED is on.
Overload pre-alarm and low battery pre-alarm
The battery is nearly exhausted and the nominal output of the
inverter is exceeded. The "overload" and "low battery" LEDs are
both blinking alternately,
Ripple pre-alarm
The ripple voltage on the battery terminals is too high. The
"overload" and "low battery" LEDs are both blinking simultaneously.
Ripple alarm
The inverter has switched off due to excess ripple voltage on the
battery terminals. The "overload" and "low battery" LEDs are both
on.
MultiPlus-II 12V/24V/48V 3kVA 120V
Page 7 Operation
Bulk charging
The AC input voltage is switched through and the charger operates
in bulk mode. The "bulk" LED is on.
BatterySafe
The mains voltage is switched through and the charger is on.
However, the set absorption voltage has not yet been reached. The
"bulk" and "absorption" LEDs are both on.
Absorption charging
The mains voltage is switched through and the charger operates in
absorption mode. The "absorption" LED is on.
Float charging
The mains voltage is switched through and the charger operates in
float mode. The "float" LED is on.
Equalize charging
The mains voltage is switched through and the charger operates in
equalize mode. The "bulk" and "absorption" LED are both blinking.
PowerControl
The AC input is switched through. The AC output current is equal
to the preset maximum input current. The charge current is
reduced to 0A. The "mains on" LED is blinking.
MultiPlus-II 12V/24V/48V 3kVA 120V
Page 8 Operation
PowerAssist
The AC input is switched through, but the load requires more
current than the preset maximum input current. The inverter is
switched on to supply the required additional current. The "mains
on" LED is on and the "inverter" LED is blinking.
For more error codes see section 7.3
For the latest and most up to date information about the
blink codes, please refer to the Victron Toolkit app.
Click on or scan the QR code to get to the Victron Support
and Downloads/Software page.
MultiPlus-II 12V/24V/48V 3kVA 120V
Page 9 Operation
4. Installation
This product may only be installed by a qualified electrical engineer.
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 10 cm 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 position the appliance directly above the batteries.
The MultiPlus-II is suitable for wall mounting. A solid surface, suitable for the weight and dimensions of the product must be
available (e.g., concrete, or masonry). For mounting purposes, a hook and two holes are provided at the back of the casing (see
appendix G).
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. You should prevent the
presence of e.g. chemicals, synthetic components, curtains or other textiles, etc., in the immediate vicinity.
Each system requires a method of disconnecting the AC and DC circuits. If the overcurrent protection device
is a circuit breaker, it will also serve as the disconnect. If fuses are used, separate disconnect switches will be
needed between the source and the fuses.
To reduce the risk of fire, do not connect to an ac load center (circuit breaker panel) having multiwire branch
circuits connected.
CAUTION – To reduce risk of injury, charge only Lead Acid or LIFEPO4 type rechargeable batteries. Other
types of batteries may burst causing personal injury and damage
Use of an attachment not recommended or sold by the marine unit manufacturer may result in a risk of fire,
electric shock, or injury to persons
MultiPlus-II 12V/24V/48V 3kVA 120V
Page 10 Installation
WARNING – RISK OF EXPLOSIVE GASES) WORKING IN VICINITY OF A LEAD-ACID BATTERY IS
DANGEROUS. BATTERIES GENERATE EXPLOSIVE GASES DURING NORMAL BATTERY OPERATION.
FOR THIS REASON, IT IS OF UTMOST IMPORTANCE THAT EACH TIME BEFORE SERVICING THE UNIT
IN THE VICINITY OF THEBATTERY, YOU READ THIS MANUAL AND FOLLOW THE INSTRUCTIONS
EXACTLY.
PERSONAL PRECAUTIONS
Someone should be within range of your voice or close enough to come to your aid when you work near a
lead-acid battery
Have plenty of fresh water and soap nearby in case battery acid contacts skin, clothing, or eyes.
Wear complete eye protection and clothing protection. Avoid touching eyes while working near battery.
If battery acid contacts skin or clothing, wash immediately with soap and water. If acid enters eye,
immediately flood eye with running cold water for at least 10 min and get medical attention immediately.
NEVER smoke or allow a spark or flame in vicinity of battery or engine.
Be extra cautious to reduce risk of dropping a metal tool onto battery. It might spark or short-circuit battery
or other electrical part that may cause explosion.
Remove personal metal items such as rings, bracelets, necklaces, and watches when working with a lead-
acid battery. A lead-acid battery can produce a short-circuit current high enough to weld a ring or the like to
metal, causing a severe burn.
NEVER charge a frozen battery.
If necessary to remove battery from vessel, always remove grounded terminal from battery first. Make sure
all accessories in the vessels are off, so as not to cause an arc.
Be sure area around battery is well ventilated. Clean battery terminals. Be careful to keep corrosion from
coming in contact with eyes. Study all battery manufacturers specific precautions such as removing or not
removing cell caps while charging and recommended rates of charge.
Clean battery terminals. Be careful to keep corrosion from coming in contact with eyes.
Study all battery manufacturers specific precautions such as removing or not removing cell caps while
charging and recommended rates of charge.
MARINE UNIT LOCATION
Locate marine unit away from battery in a separate, well ventilated compartment
Never place marine unit directly above battery; gases from battery will corrode and damage marine unit.
Never allow battery acid to drip on marine unit when reading gravity or filling battery.
Do not operate marine unit in a closed-in area or restrict ventilation in any way.
DC CONNECTION PRECAUTIONS
Connect and disconnect DC output connections only after setting any marine unit switches to off position and
removing AC cord from electric outlet or opening AC disconnect.
EXTERNAL CONNECTIONS TO CHARGER SHALL COMPLY WITH THE UNITED STATES COAST GUARD
ELECTRICAL REGULATIONS (33CFR183, SUB PART I).
GROUNDING INSTRUCTIONS – This marine unit should be connected to a grounded, metal, permanent
wiring system; or an equipment-grounding conductor should be run with circuit conductors and connected to
equipment-grounding terminal or lead on unit. Connections to unit should comply with all local codes and
ordinances
4.2. Connection of battery cables
In order to utilize the full capacity of the product, batteries with sufficient capacity and battery cables with sufficient cross-section
should be used. The DC cables must be copper and rated 90ºC (194ºF). See table.
12/3000/120 24/3000/70 48/3000/35
MultiPlus-II 12V/24V/48V 3kVA 120V
Page 11 Installation