MultiPlus-II 12/4k/160-32

The MultiPlus-II 12/4k/160-32 is a versatile power management solution from Victron Energy. It combines three main functions into a single unit:

A pure sine wave inverter that converts direct current (DC) from your batteries into 230 V alternating current (AC).A powerful adaptive battery charger capable of charging your batteries.An ultra-fast AC transfer switch that ensures uninterrupted power supply in case of mains or generator failure.It is designed for marine environments, vehicles, and standalone systems, providing reliable power for sensitive loads.

The MultiPlus-II 12/4k/160-32 delivers continuous output power of 3400 W (4000 VA) at 25°C. This power is available to supply your alternating current (230 VAC) devices from your 12 VDC battery bank.

This MultiPlus-II 12/4k/160-32 model has a battery charging capacity of 160 A. This means it can recharge your batteries with a maximum current of 160 amperes, ensuring fast and efficient charging.

The PowerControl and PowerAssist functions are designed to optimize energy use and prevent overloads:

PowerControl limits the AC input current from the grid or a generator, preventing overload of the external power source. PowerAssist complements this function by drawing energy from the battery to compensate for a power shortage when demand exceeds the capacity of the external AC source (grid or generator). This allows powering higher loads without requiring an oversized AC connection.

Yes, the MultiPlus-II 12/4k/160-32 is particularly suited to energy storage systems (ESS). It includes anti-islanding protection, essential for safety and compliance in many countries, allowing integration into grid-connected systems for self-consumption and energy management.

The MultiPlus-II 12/4k/160-32 is equipped with two AC outputs:

A main output with uninterruptible power supply function, which provides continuous power to essential loads even if the external AC source fails.A second output dedicated to non-priority loads. This output is cut off when the MultiPlus-II is running on battery power to prevent unnecessary discharge of the battery bank.

Yes, the MultiPlus-II 12/4k/160-32 can be configured for three-phase operation. To do this, three units of the same model must be used, each connected to a different phase.

The MultiPlus-II 12/4k/160-32 is designed for a wide range of demanding applications requiring reliable power. Its main use cases include:

Marine environments (boats, yachts).
Vehicles (motorhomes, converted trucks).
Standalone systems (remote sites, cabins).

The MultiPlus-II 12/4k/160-32 can be monitored and controlled in several ways:

Locally: Via the VEConfigure software (requires an MK3-USB interface), or via a GX device such as an Ekrano GX or a Cerbo GX. An optional VE.Bus Smart dongle also enables local monitoring via Bluetooth.
Remotely: Victron Energy's free VRM Online portal allows remote monitoring and control over the internet, once connected to a GX device.

Yes, it is possible to increase the output power by connecting multiple MultiPlus-II 12/4k/160-32 units in parallel. The system allows up to six units of the same model to be connected in parallel to increase total conversion and charging capacity.

The Victron Energy current transformer is used with the MultiPlus-II to measure AC current on an external conductor without the current passing through the inverter-charger itself. It enables the implementation of PowerControl and PowerAssist functions and optimizes self-consumption by detecting external current. It helps the MultiPlus-II determine the amount of energy flowing to or from the grid.

To connect the current transformer to the MultiPlus-II:

The current transformer clips around the AC conductor. It is crucial to respect the direction: the arrow on the transformer must point toward the MultiPlus-II. The transformer cable connects directly to the dedicated terminals on the MultiPlus-II. For newer MultiPlus-II models, remove the wire jumper, then connect the red wire to the EXT terminal and the white wire to the COM terminal. Polarity is important. For older models, simply plug the jack of the current transformer into the headphone jack.

The 100 A current transformer has certain limitations:

It only supports single-phase monitoring.It measures current but not voltage.Its accuracy is lower than that of a dedicated energy meter, especially at low currents.The transformer's wires must not be extended or shortened, as they are calibrated for specific use with the transformer.

Yes, a 400 A current transformer can be used with the MultiPlus-II, but only in an application with an external transfer switch. This setup is typical in multi-unit three-phase systems where an external transfer switch replaces the internal AC switches of each individual MultiPlus-II.

No, the current transformer cable must not be lengthened or shortened. It is calibrated specifically for use with the current transformer, and any modification to its length could affect measurement accuracy.

Yes, the MultiPlus-II 12/4k/160-32 can be connected to lithium battery systems from other manufacturers. However, the third-party battery’s Battery Management System (BMS) must control the charging and discharging processes.

To connect a third-party lithium battery system to the MultiPlus-II, the following requirements must be met:

The battery’s BMS must provide two separate dry contacts for the overvoltage/full battery and undervoltage/empty battery signals.The MultiPlus-II must be updated with the latest firmware version and have auxiliary inputs available.It is necessary to use the "Two-Signal BMS Support" assistant in the VEConfigure3 software to properly configure the system.Isolation must be present on the BMS side, typically via a small dry-contact relay or an optocoupler.

When an external BMS reports an overvoltage or fully charged battery condition, the MultiPlus-II can be configured to:

Switch to Float mode (floating): The battery is no longer actively charged.Disable the charger: The charging process is completely stopped.When the BMS reports an undervoltage or fully discharged battery condition, the inverter of the MultiPlus-II is disabled to protect the battery from excessive discharge.

No, in a parallel or three-phase system, the battery management system (BMS) must only be wired to a single MultiPlus-II unit (the master unit). However, the "Two-Signal BMS Support" assistant must be programmed into all MultiPlus-II units in the system to ensure correct coordination.

For local monitoring and configuration of the MultiPlus-II via the VEConfigure software, you will need an MK3-USB interface. This accessory connects the MultiPlus-II to a computer via USB to access settings and data.