Victron MultiPlus-II inverter charger front view, showing the blue steel case and the charger and inverter status LED panel

Victron MultiPlus-II 12/3000/120 at an angle, showing the front panel model markings and the ventilated side of the case

Victron MultiPlus-II 12/3000/120 viewed from the front and below, showing the cable gland entries along the base of the connection area

Connection area of the Victron MultiPlus-II with the cover removed, showing the AC-OUT-1, AC-OUT-2 and AC-IN terminals, VE.Bus ports, current sense, remote on off, auxiliary relay and the battery terminals

Victron MultiPlus-II with the connection cover removed, showing the terminal layout, cable glands and the main on off switch

Angled view into the Victron MultiPlus-II connection area, showing the AC terminals, battery posts and cable gland entries

Victron MultiPlus-II front view showing the charger and inverter indicator panel and the AC input and output schematic

Victron Energy

Victron MultiPlus-II 12V Inverter Charger 3kVA and 5kVA

PMP122305010

The MultiPlus-II is a combined pure sine inverter and battery charger with two AC outputs, built for professional marine, vehicle and off-grid work as well as grid-connected energy storage. The 12V models are the ones we fit most often in…

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Suited to vehicle and camper builds, marine work and off grid systems running a 12V battery bank. This is the voltage we fit most often in workshop builds. For larger fixed installations, the 24V and 48V models deliver the same output at lower current.

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120A OR 220A CHARGER

Serious charge current back into a 12V bank from shore power or a generator, not a trickle.

SWITCHES OVER IN UNDER 20ms

Fast enough that computers and sensitive gear ride through a mains failure. It is a UPS as well.

2400W OR 4000W CONTINUOUS

With 5500W and 9000W peaks for motors and compressors starting up.

POWERASSIST BOOSTS A SMALL SUPPLY

Covers the shortfall from the battery when a generator or shore supply cannot meet a peak.

5 YEAR VICTRON WARRANTY

Backed by a 5 year limited warranty, with free remote monitoring through the VRM portal.

The 3kVA is the 12/3000/120-32. It delivers 3000VA, which is 2400W continuous at 25°C, carries a 5500W peak for motor startup and other short surges, and charges at up to 120A. The 5kVA is the 12/5000/220-50, delivering 5000VA or 4000W continuous with a 9000W peak and a 220A charger, which is a serious amount of current back into a 12V bank from shore power or a generator.

Worth knowing before you size a system: continuous output derates with heat. The 3kVA drops to 2200W at 40°C and 1700W at 65°C, and the 5kVA to 3700W and 3000W. In a hot engine bay or an enclosed cabinet, design around the 40°C figure rather than the headline one.

Two features do most of the work in practice. PowerAssist lets the unit fill the gap when a generator or shore supply cannot meet a peak, drawing the shortfall from the battery and then recharging it once the load drops, which means a small supply can run bigger loads than it otherwise could. PowerControl works the other way, capping the current drawn from that supply so you never trip the source.

The transfer switch changes over in under 20 milliseconds, fast enough that computers and sensitive electronics do not notice the change, so it doubles as a UPS. There are two AC outputs: the main one is uninterrupted, while the second is live only when AC input is present. That second output is where a water heater or anything else that must not flatten the battery should go.

Systems can be scaled by paralleling up to six units, or configured for three phase. Setup is done through VEConfigure, and adding a Cerbo GX or similar brings remote monitoring and configuration through the free VRM portal. It works with lead acid and lithium alike, with an adaptive charge algorithm that adjusts to suit.

Pure sine wave inverter with a 5500 W peak for motor startup and short surges
Adaptive multi-stage battery charger suiting both lead acid and lithium
PowerAssist covers a shortfall from a generator or shore supply using the battery, then recharges it when the load drops
PowerControl caps the current drawn from the supply so you never trip the source
Transfer switch changes over in under 20 milliseconds, so it doubles as a UPS
Two AC outputs, the second live only when AC input is present
Parallel up to 6 units, or configure three units for three phase
Two programmable relays and an auxiliary output
Remote monitoring and configuration through the free VRM portal with a GX device
Built-in anti-islanding with country approvals for energy storage systems

Model designations3kVA: 12/3000/120-32 5kVA: 12/5000/220-50

InverterContinuous Output at 25 degrees C: 3000 VA or 2400 W on the 3kVA, 5000 VA or 4000 W on the 5kVA Continuous Output at 40 degrees C: 2200 W on the 3kVA, 3700 W on the 5kVA Continuous Output at 65 degrees C: 1700 W on the 3kVA, 3000 W on the 5kVA Peak Power: 5500 W on the 3kVA, 9000 W on the 5kVA Maximum Efficiency: 93 percent on the 3kVA, 95 percent on the 5kVA Zero Load Power: 13 W on the 3kVA, 15 W on the 5kVA Output Voltage: 230 VAC plus or minus 2 percent, 50 Hz DC Input Range: 9.5 to 17 V

ChargerMaximum Charge Current: 120 A on the 3kVA, 220 A on the 5kVA AC Input Range: 187 to 265 VAC, 45 to 65 Hz Absorption Voltage: 14.4 V Float Voltage: 13.8 V Storage Voltage: 13.2 V Transfer Switch: 32 A on the 3kVA, 50 A on the 5kVA Transfer Time: Under 20 milliseconds

GeneralOperating Temperature: Minus 40 to plus 65 degrees C, fan assisted cooling Enclosure: Steel, blue RAL 5012, IP22 Weight: 19 kg on the 3kVA, 33 kg on the 5kVA Battery Connection: M8 bolts on the 3kVA, four M8 bolts on the 5kVA Parallel and Three Phase Capable: Yes, up to 6 units

3kVA: 546mm H x 275mm W x 147mm D, 19 kg

5kVA: 702mm H x 345mm W x 152mm D, 33 kg

Everything this install needs

0 of 0 in the box

Wall mounted, steel enclosure rated IP22. It is not weatherproof, so it must be mounted inside a protected space.
Cooling is fan assisted, so allow clear airflow around the unit. Continuous output derates with heat - design around the 40 degrees C figure of 2200 W rather than the 25 degrees C headline of 2400 W.
Battery connection is by M8 bolts on the 3kVA models. Size the DC cable for the full charge and inverter current, which on the 12V 3kVA is substantial.
AC connection is by screw terminals accepting up to 13 mm2, which is 6 AWG.
The second AC output is live only when AC input is present. Put loads that must not flatten the battery, such as a water heater, on that output.
Set the AC input current limit to suit the shore supply or generator so PowerControl can do its job.
Configuration is through VEConfigure, which needs a computer and an MK3-USB interface. A Cerbo GX or similar adds remote monitoring through the VRM portal.
All 230V work must be carried out by a licensed electrician and comply with the relevant standards.
A battery temperature sensor is included with 12V and 24V models but not with 48V models.

Q: Which model should I choose?
A: Match the voltage to your battery bank. For most vehicle and camper builds that is the 12V 3kVA, which is the 12/3000/120-32 and carries a 120A charger. Larger fixed installations usually run 24V or 48V, where the same 3kVA output is delivered at lower current and higher efficiency.

Q: How much can it actually run?
A: 2400 W continuously at 25 degrees C, with a 5500 W peak for short surges like a motor starting. Be aware the continuous figure derates with heat - 2200 W at 40 degrees C and 1700 W at 65 degrees C - so in a hot cabinet or engine bay design around 2200 W.

Q: What does PowerAssist actually do?
A: It lets a small supply run bigger loads than it should. If a generator or shore supply cannot meet a peak, the MultiPlus-II makes up the shortfall from the battery, then recharges the battery once the load drops. PowerControl is the other half - it caps what is drawn from that supply so you never trip it.

Q: Can I use it as a UPS?
A: Yes. The transfer switch changes over in under 20 milliseconds, which is quick enough that computers and sensitive electronics keep running through a mains failure.

Q: What is the second AC output for?
A: It is live only while AC input is present, so it drops out when you lose mains. Put anything on it that must not flatten the battery - a water heater is the usual example.

Q: Will it charge lithium?
A: Yes. The adaptive charge algorithm supports both lead acid and lithium, with charge voltages configurable to suit the battery.

Q: How do I set it up and monitor it?
A: Configuration is done with VEConfigure, which needs a computer and an MK3-USB interface. Adding a Cerbo GX or similar gives you monitoring and remote configuration through the free VRM portal, plus alarms by email or push notification.

Q: Can I add more capacity later?
A: Yes. Up to six units can run in parallel, and three units of the same model can be configured for three phase output, so the system can grow without replacing what you have.

Q: Can it feed back into the grid?
A: Yes, when configured as part of an Energy Storage System. It has built-in anti-islanding and holds country approvals for ESS use.

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