The Victron MultiPlus 12/1200/50-16 combines a sine wave inverter and multi-stage battery charger in one unit, built for 12V battery banks with a 230V AC output. It suits off-grid installations, marine and vehicle applications, and backup power systems where a compact inverter charger is needed. The 50A charger and 16A transfer switch make it practical for setups with a shore power or generator input.

Power inverter charger key features

• Inverter output: 1200VA continuous at 230V AC from a 12V DC battery bank.
• Battery charger: 50A with an adaptive charge algorithm for different battery chemistries.
• AC transfer switch: 16A automatic changeover between shore or generator power and inverter output.
• VE.Bus interface: allows remote monitoring, parallel operation or three-phase configuration with compatible Victron units.
• PowerAssist: supplements a limited shore or generator supply to prevent overload.
• UPS function: near-instant transfer time for sensitive loads.

How it works

When AC power is available, the MultiPlus charges the battery bank and passes power through to connected loads. If AC input drops out, it switches to inverter mode automatically, fast enough for most computers and sensitive equipment to stay running. The 50A charger recharges a 12V bank reasonably quickly from a generator, and the adaptive algorithm adjusts to the battery's condition rather than applying a fixed profile. It works with lead-acid batteries (AGM, gel, flooded) and lithium batteries once configured correctly.

System integration

VE.Bus connectivity lets the MultiPlus 12/1200/50-16 join a larger Victron setup. Multiple units can run in parallel for more output, or in split-phase and three-phase arrangements, so the unit works as a starting point for scalable systems rather than a fixed-capacity standalone product. It is compatible with Victron GX devices and the VictronConnect app for configuration and monitoring.

Applications

• Off-grid cabins, lodges and outbuildings with a 12V battery bank and generator backup.
• Marine vessels needing 230V AC output from a 12V house battery system.
• Motorhomes, campervans and vehicle conversions with shore power hookup.
• UPS and backup power for communications equipment or medical devices.
• Small off-grid solar systems paired with a Victron MPPT charge controller and GX device.

Installation notes

Installation should be carried out by a qualified electrician, with battery, AC distribution board and any grid or generator connections complying with BS 7671. Grid-connected installations require G98 or G99 compliance and DNO notification. Lithium battery use requires correct configuration through VE.Bus or VictronConnect before commissioning, and DC cabling must be rated for the currents involved at 12V with appropriate fusing fitted.