MultiPlus-II 48/3000/35-32

The Victron Energy MultiPlus-II 48/3000/35-32 is an integrated power solution combining multiple essential functions in a single device. It serves as a pure sine wave inverter, an adaptive battery charger, and a high-speed AC transfer switch. It is designed for various applications, including standalone systems, marine setups, recreational vehicles, and backup installations.

The MultiPlus-II 48/3000/35-32 inverter delivers a continuous output power of 3000 VA, equivalent to 2400 W at an ambient temperature of 25°C. It can also handle a peak power of 5500 W.

The MultiPlus-II provides an AC output voltage of 230 VAC ± 2%. The output frequency is 50 Hz, but it is adjustable to 60 Hz depending on installation requirements.

The nominal DC input for the MultiPlus-II 48/3000/35-32 is 48 V. The device supports a DC input voltage range from 38 to 66 VDC.

The built-in charger of the MultiPlus-II 48/3000/35-32 can provide a maximum charging current of 35 A for 48 V battery banks.

For optimal charging of 48 V batteries, absorption voltages are 57.6 V DC and float voltages are 55.2 V DC.

The MultiPlus-II integrates PowerControl and PowerAssist functions. These functions are designed to prevent overloading limited AC sources, such as generators or shore power supplies. PowerControl adjusts the battery load, while PowerAssist can supplement AC power if needed by drawing energy from the battery.

Yes, the MultiPlus-II includes a UPS (Uninterruptible Power Supply) function. This function provides continuous power to critical loads in under 20 milliseconds in the event of a mains power failure, ensuring service continuity.

The MultiPlus-II has two AC outputs:

The main output has a seamless transfer function, providing continuous power even if the AC input fails.The second output is active only when AC input is present and is typically used for non-essential loads that do not need to be powered in case of a grid failure.

The MultiPlus-II 48/3000/35-32 system achieves an energy efficiency of 95%, enabling optimized power conversion and reduced losses.

The idle power consumption of the MultiPlus-II varies depending on the operating mode:

Standard mode: 11 W
AES (Automatic Economy Switch) mode: 7 W
Search mode: 2 W

The MultiPlus-II 48/3000/35-32 has an IP22 rating, meaning it is protected against solid objects larger than 12.5 mm and against water droplets falling at an angle up to 15° from the vertical.

The device dimensions are approximately 506 mm (height) x 275.4 mm (width) x 147.1 mm (depth). These measurements are important for planning the installation space.

The MultiPlus-II 48/3000/35-32 is designed to operate within a wide temperature range from -40°C to +65°C, with fan-assisted cooling to maintain performance.

To connect an external current transformer to the MultiPlus-II, clip the transformer around the AC conductor. It is crucial to respect the connection direction: the arrow on the current transformer must point toward the MultiPlus. For recent models, the transformer wires connect directly to the external current sensor terminals on the MultiPlus-II. The red wire must be connected to the EXT terminal and the white wire to the COM terminal, as the transformer is polarity-sensitive.

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

Yes, the MultiPlus-II can be connected to lithium battery systems from other manufacturers. The third-party battery management system (BMS) must be capable of controlling the battery’s charge and discharge and providing appropriate signals to the MultiPlus-II.

To connect a third-party lithium BMS, the BMS signals must be two separate potential-free contacts wired to the MultiPlus. On the Multi side, this is an uninsulated analog voltage measurement with a pull-up resistor. It is recommended to use a small potential-free relay for isolation. Additionally, the MultiPlus-II must be updated with the latest firmware version and the "Two-Signal BMS Support" assistant must be configured via VEConfigure3.

Yes, an external current transformer can be used with the MultiPlus-II to measure AC current on an external conductor. This allows the PowerControl and PowerAssist functions to be implemented and optimizes self-consumption by detecting external current. It is particularly useful when a full energy meter installation is not required.

Yes, an external current transformer can be used in a three-phase installation, particularly in an application with an external transfer switch. In this case, one current transformer is required per phase and must be connected to the master unit of that phase. It is important to note that the current transformer only supports single-phase monitoring.