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Victron 9kW 3-Phase Off-Grid System

Off-Grid Kits




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Victron specialise in off-grid systems and equipment, having spent decades in the marine industry. The BYD B-Box lithium batteries are produced by the same fully automation traction battery production line as the BYD double-decker E-Buses in London.

The Multiplus inverter/charger is the core component of any off-grid system as it produces the micro-grid that powers the home. The output of the Fronius PV inverter can be controlled automatically by the Multiplus to regulate battery charging.

The Colour Control GX panel allows for complete control and monitoring of the system, including real-time  updates to the Victron VRM Online Portal which can be monitored from anywhere with an internet connection (including iOS and Android apps!)

The Multiplus must be sized suitably for the property. 3kW is a suitable size for a small off-grid home with one or two occupants. When sunlight is available the Fronius PV inverter can also output up to 5kW directly to the home in addition to the Multiplus; any spare generation will go to the batteries.

A generator or other AC source can be connected to the Multiplus for backup, with auto-start functionality based on battery state of charge and AC load level.

Any lead-acid batteries can be used, however AGM tend to require the least maintenance. BYD lithium batteries are supported for Victron off-grid systems. The battery capacity is scalable up to potentially hundreds of kWh.


  • Rated Continuous Power Output: 3kVA
  • Max. Charge Current: 35A (1680W)
  • Nominal Battery Voltage: 48V
  • Nominal Battery Capacity: 50Ah-800Ah (Lithium); Unlimited (Lead-Acid)
  • Transfer Switch: 16A (4kW)
  • Dimensions: 362 x 258 x 218mm (Multiplus); 
  • Weight: 18Kg (Multiplus); 21.5kg (Fronius Primo)
  • Warranty: (Victron 5 Years); (Fronius 7 Years once Registered)

Kit Includes

  • 12 x 260W Polycrystalline Panels (other panels available upon request)
  • 48V 3kVA Multiplus Inverter/Charger
  • Fronius Primo WLAN 3kW Solar PV Inverter
  • Lead-Acid (with Victron BMV Battery Monitor) or BYD Lithium Batteries
  • Colour Control GX with WiFi and Wall Enclosure
  • Necessary Solar, Battery and Com Cables, Generation Meter, Isolators, Switches, Terminal Covers and Multiplus Programming Interface

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