Victron Energy MultiPlus-II 4k5/6k5 230V Inverter/Charger
Product Overview
The Victron Energy MultiPlus-II is a versatile inverter/charger designed for professional marine, yachting, vehicle, and off-grid applications. It offers all the features of the renowned MultiPlus inverter/charger, enhanced with an external current sensor option to extend PowerControl and PowerAssist capabilities up to 50 A and 100 A. The unit also includes a built-in anti-islanding function, making it suitable for various system configurations, including those integrating solar energy.
Key Features
PowerControl and PowerAssist
These functions allow for boosting grid or generator power capacity. The maximum grid or generator current can be set. PowerControl prevents overload by managing battery charging and other AC loads, while PowerAssist compensates for insufficient grid or generator power by drawing from the battery during peak demand. Surplus power is then used to recharge the battery.
Solar Energy Integration
The MultiPlus-II can be used with grid-connected PV and other alternative energy systems, even when not connected to the grid. It is compatible with solar charge controller units and grid-connected inverters, enabling AC power availability even during grid failures.
Dual AC Outputs
The main power output provides an uninterruptible power supply (UPS) function, switching to loads in less than 20 milliseconds during grid failures. The second power output operates only when AC is available at the input and is suitable for non-critical loads that do not drain the battery, such as water heaters. Loads on the second output are managed by PowerControl and PowerAssist.
Parallel and Three-Phase Operation
Up to six MultiPlus-II units can be paralleled for increased power output. Three units of the same model can be configured for three-phase output, and up to six such three-phase setups can be paralleled.
System Configuration and Monitoring
System settings can be quickly configured using VEConfigure software (requires a desktop/laptop and MK3-USB interface). Monitoring and control options include Ekrano GX, Cerbo GX, Venus GX, laptops, desktop computers, Bluetooth (with optional VE.Bus Smart dongle), battery monitors, and the Digital Multi Control Panel.
Remote Configuration and Monitoring
Connecting a Cerbo GX or other GX product allows internet access for remote system monitoring and configuration via the VRM (Victron Remote Management) website. Operational data is stored and viewable for free on the VRM portal, with the ability to make setting changes remotely.
System Diagrams
Standard Marine, Mobile, or Off-Grid Applications
This diagram illustrates a typical setup for marine, mobile, or off-grid use. It shows the connections between the Grid, Generator, Battery, and Loads, with the MultiPlus-II as the central power management unit. Loads that should shut down when AC input power is unavailable can be connected to a secondary output, managed by PowerControl and PowerAssist to limit input current.
Parallel Grid Topology with MPPT Solar Charge Controller
This diagram depicts a parallel grid topology incorporating an MPPT solar charge controller. It shows a PV array connected to an MPPT solar charger, which then interfaces with the Battery and the MultiPlus-II. The system also connects to the Grid and Loads. The MultiPlus-II utilizes data from an external AC current sensor or power meter to optimize self-consumption and manage grid feed-in, ensuring critical loads remain powered during outages.
Technical Specifications
| MultiPlus-II 230 V | ||
| 4k5 | 6k5 | |
| INVERTER | ||
| Output voltage | 230 VAC ± %2 | |
| Frequency | 50 Hz ± %0.1 (1) | |
| Continuous output power at 25 °C | 4 kW | 5.7 kW |
| Continuous output power at 40 °C | 3.7 kW | 4.6 kW |
| Continuous output power at 65 °C | 3 kW | 4.6 kW |
| Time-limited power 1 (cold start) | 4.5 kW/2 h | 6.5 kW/4 h |
| Time-limited power 2 (cold start) | 6 kW/25 min | 8 kW/1 h |
| Peak power | 7 kW | 11 kW |
| Maximum efficiency | 95% | 96% |
| Zero load power | 20 W | 28 W |
| Zero standby power in AES mode | 13 W | 18 W |
| Zero standby power in search mode | 8 W | 8 W |
| CHARGER | ||
| AC input voltage range | 187 - 265 VAC | |
| AC input frequency | 45 - 65 Hz | |
| Charge voltage "absorption" | 57.6 V | |
| Charge voltage "float" | 55.2 V | |
| Storage mode | 52.8 V | |
| Maximum battery charge current at 25 °C | 50 A | 95 A |
| Maximum battery charge current at 40 °C | 50 A | 100 A |
| Battery temperature sensor | Yes | |
| GENERAL | ||
| PowerControl and PowerAssist | Yes | |
| Transfer switch | Yes (32 A) | |
| Maximum AC input current | 32 A | 50 A |
| DC input voltage range | 38-60 V | |
| Auxiliary output | Yes (32 A) | |
| External AC current sensor (optional) | 50 A or 100 A | |
| Programmable relay (3) | Yes | |
| Protection (2) a-g | Yes | |
| VE.Bus communication port | Yes | |
| General purpose communication port | Yes, 2x | |
| Remote on-off | Yes | |
| Operating temperature range | -40 to +65 °C (-40 to 150 °F) (fan-assisted cooling) | |
| Humidity (non-condensing) | max. 95% | |
| Maximum altitude | 2000 m | |
| Material and Colour | Steel, blue RAL 5012 | |
| Degree of protection | IP21 | |
| Battery connection | M8 bolts | |
| AC connection | Screw terminals 13 mm² (6 AWG) | |
| Weight kg | 21.4 | 29.0 |
| Dimensions (hxwxd) mm | 590 x 275 x 149 | 644 x 320 x 150 |
| Safety | EN-IEC 60335-1, EN-IEC 60335-2-29, EN-IEC 62109-1, EN-IEC 62109-2 | |
| Emission, Immunity | EN 55014-1, EN 55014-2, EN-IEC 61000-3-2, EN-IEC 61000-3-3, IEC 61000-6-1, IEC 61000-6-2, IEC 61000-6-3 | |
| Uninterruptible power supply | Certification pending | |
| Anti-islanding | Certification pending | |
| For parallel and three-phase operation | Yes | |
| VRM Portal | Yes | |
| VRM app | Yes | |
Accessories and Monitoring
Cerbo GX
Provides intuitive system control and monitoring, enabling access to the VRM Online Portal for free remote monitoring.
Digital Multi Control Panel
A low-cost solution for monitoring and control, featuring an on/off button for the charger, full LED status indication, and a rotary knob for adjusting PowerControl and PowerAssist levels.
VE.Bus Smart Dongle
Enables monitoring and control via Bluetooth when used with the VictronConnect app. It also measures battery voltage and temperature.
MK3 - USB Interface
Required for configuring the MultiPlus-II. It connects to the unit via an RJ45 UTP cable and plugs into a USB port on a computer, allowing use with the VictronConnect app or VEConfigure software.
Current Sensor 100 A:50 mA
Used for implementing PowerControl and PowerAssist functions and optimizing self-consumption with an external current sensing system. It measures up to a maximum current of 100 A.
Further Information
For more details, visit the Victron Energy product page: Victron Energy MultiPlus-II
