MultiPlus-II 12/3000/120-32

The Victron Energy MultiPlus-II is a multifunctional device that combines the functions of an inverter (DC-AC converter), a battery charger, and an automatic transfer switch. It is designed for energy storage systems (ESS) and includes PowerControl and PowerAssist features. This device is ideally suited for professional marine applications, yachting, vehicles, and off-grid terrestrial installations.

Yes, the MultiPlus-II can be connected to lithium battery systems from other manufacturers. For this, the external battery management system (BMS) must provide two separate dry contacts to signal overcharge and discharge conditions. The MultiPlus-II must be updated with the latest firmware version (19xx2xx/20xx2xx or 26xx4xx/27xx4xx) and configured using the "Two-Signal BMS Support" assistant via the VEConfigure3 software. It is recommended to use a small relay for BMS-side isolation.

In a parallel or three-phase system, the BMS must be wired to one Multi only, but the assistant must be programmed in all Multis of the system.

The MultiPlus-II 12/3000/120-32 has two AC outputs:

Main output (AC Out 1): This output features a "no-break" function. If the grid fails or the AC input (shore power/generator) is disconnected, the MultiPlus-II takes over powering the connected loads in under 20 milliseconds. This ensures uninterrupted operation for sensitive equipment such as computers.Secondary output (AC Out 2): This output is active only when AC power is available at the MultiPlus-II's input. It is designed to connect loads that must not discharge the battery, such as a water heater, for example.

The MultiPlus-II 12/3000/120-32 integrates two key functions to optimize energy management:

PowerControl: This function allows setting a maximum current for the grid or generator. The MultiPlus-II accounts for other AC loads and uses excess power to charge the battery, preventing the generator or grid from being overloaded.PowerAssist: This is an extension of PowerControl. When peak power is required for a limited period, the MultiPlus-II compensates for insufficient power from the generator, shore power, or grid by drawing energy from the battery. When the load decreases, the excess power is then used to recharge the battery.