Victron Energy MultiPlus-II 24/5000/120-5024V 5000VA inverter/charger with 120A charger and 50A transfer switch

Overview

The MultiPlus-II 24/5000/120-50 supplies 5000VA (4000W) continuously at 25°C and 9000W peak from a 24V battery, with a 120A charger, a 50A transfer switch and up to 96% efficiency. A 4A output keeps a starter battery topped up and the temperature sensor is supplied. Victron recommends 400–1400Ah of battery with a 400A DC fuse and two 50mm² cables per pole up to 5m. It measures 607×330×149mm and weighs 30kg; an ECE R10 automotive type approval is published for the 24V 5kVA model.

• 3kVA to 15kVA models for 12V, 24V and 48V batteries
• Transfer to inverter in under 20ms
• Two AC outputs, PowerControl and PowerAssist
• ESS feed-in with password-protected country grid codes
• Up to six units in parallel, three-phase capable
• VE.Bus link to GX devices and the VRM portal

How it works

The MultiPlus-II combines a sine-wave inverter with a mains-frequency isolating transformer, an adaptive four-stage charger and an automatic transfer switch. While grid, shore or generator power is present it supplies the loads and charges the battery; if that supply fails, the loads on AC-out-1 are taken over by the inverter within 20ms. AC-out-2 is live only with AC input present, so loads such as a water heater never discharge the battery.

PowerControl caps the current taken from the grid or a generator; PowerAssist adds battery power when the loads exceed that limit. In grid-parallel systems an external 100A current sensor or an energy meter measures the grid connection, so the unit can maximise self-consumption and, if required, prevent feed-in. For ESS feed-in a country grid code is selected in VEConfigure and then password-protected; ESS does not apply to the 12/3000/120-32.

Model ranges

The classic range covers 3kVA and 5kVA units for 12V, 24V and 48V, plus 48V units of 8kVA, 10kVA and 15kVA with a 100A transfer switch. The newer 12/4k/160-32, 48/4k5/55-32 and 48/6k5/100-50 deliver more power per kilogram, quote time-limited ratings from a cold start (for example 6.5kW for 4h on the 48/6k5) and are rated for up to 4000m altitude with derating above 2000m. The 12V and 24V models have a 4A starter-battery output.

Installation and compatibility

Mount the unit on a solid wall in a dry, ventilated room close to the batteries. Victron's manuals give battery capacity, DC fuse and cable for each model, from 100–400Ah with a 125A fuse for the 48/3000/35-32 to 600–2400Ah with a 600A fuse for the 12/5000/220-50. Victron Lithium Smart batteries need a VE.Bus BMS V2 or Lynx Smart BMS; other lithium batteries follow Victron's battery compatibility list. The temperature sensor is supplied with 12V and 24V models and optional on 48V models.

Up to six identical units can be paralleled on one battery, and three units form a three-phase wye system; delta is not supported. The 8k, 10k and 15k models can only be paralleled with an external AC transfer switch, and paralleled strings of these sizes cannot be combined in three-phase. A system with fixed trip limits must not exceed 30kW on a single point of common connection.

Monitoring and settings

Settings are made with VEConfigure through an MK3-USB interface, or in VictronConnect over Bluetooth with the optional VE.Bus Smart dongle. A GX device such as the Cerbo GX or Ekrano GX connects via VE.Bus and adds the VRM portal, remote configuration and ESS control. The built-in battery monitor can switch the programmable relay to start and stop a generator by state of charge, voltage or load.

Questions and answers