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What if you could build large off-grid systems with the same simplicity as small ones – just by adding more independent units, increasing reliability, and scaling total capacity as you grow?
Large off-grid systems have traditionally been complex to build and difficult to change; Victron Microgrid takes a different approach.
Victron Microgrid allows multiple independent Victron inverter/charger systems, named “Power Banks” to operate in parallel on a shared AC bus – even when Power Bank sizes vary – forming high-power off-grid systems that automatically share the load.
Each Power Bank is a complete, independent Victron installation with its own inverter/chargers, batteries and monitoring. No central controller, and no data communication wiring between units. If you need more power you can just add another Power Bank, and scale the system – up to 400 kW.
Why Victron Microgrid?
- Scale beyond a single system.
Multiple Power Banks on a shared AC bus let you build off-grid systems much larger than a single VE.Bus system, without the complexity and risk of one big centralised inverter installation.
- Keep running when a unit goes down.
Each Power Bank operates on its own. If one is taken offline for service or develops a fault, the rest continue supplying the AC bus uninterrupted. Removing any single point of failure.
- Add or remove capacity without downtime.
Connect more Power Banks to the Microgrid as demand grows. Disconnect them when demand drops or maintenance is needed. No reprogramming required, and the AC bus stays live to loads the whole time.
- Build with what installers already know.
No new hardware. Victron Microgrid uses the same inverter/chargers, batteries, charge controllers and GX devices that installers already work with. Each Power Bank is monitored through its own GX device and VRM.
- Move equipment between sites.
Perfect for rental: containerised Power Banks can go from one project to the next. When a job is done, the same hardware returns to the depot and goes out again ready to join another Microgrid. A standard, efficient container build can be used to satisfy a broad range of applications by simply joining them together via AC wiring on site.
Applications
Because each Power Bank is self-contained, Victron Microgrid works well on sites where demand changes over time and equipment may need to move between projects.
1. Generator rental fleets
Rental operators can treat Power Banks as modular fleet assets. Instead of maintaining many fixed-capacity systems for different jobs, stock standardised Power Banks and combine them to match each contract. A smaller deployment might use two Power Banks; a larger job may need six or more. When a contract ends, the same units return to the depot and go out again in a different combination. Power Banks can be grouped together as a Microgrid in VRM to provide remote monitoring, alarms and visibility across active sites.
2. Construction sites
Construction sites often have a stable base-load with temporary spikes in demand. Site offices, lighting and tools may run for months at one level, then a crane, welding gear or other heavy equipment drives consumption up.
Extra Power Banks can be brought to site, connected to the AC bus for the peak period, and removed when it’s over. Match capacity to the actual stage of the project and reduce dependence on generator runtime where silent, battery-based power is preferred or required.
3. Events and festivals
Demand profiles shift across bump-in, live operation and bump-out. Peak power may only be needed for part of the schedule, but reliable supply is needed throughout. Deploy more Power Banks for peak periods, fewer for quieter ones with no need to redesign the system. If the programme changes, add capacity quickly by connecting another Power Bank to the AC bus. And if one unit has an issue, the rest keep running.
4. Expanding existing off-grid systems
Victron Microgrid is also a practical way to upgrade an existing Victron off-grid installation. Instead of pulling a working system apart to make it bigger, install a second Power Bank alongside it and connect both to the same AC bus. The original system stays as it is and just becomes one of the Power Banks in the Microgrid. This is useful for containerised or remote installations where reworking what’s already there would be disruptive. Each Power Bank manages its own charging, so the new unit needs its own charging sources such as additional solar, a DC generator connection, or other DC charging.
How Victron Microgrid works
A Power Bank is a complete Victron off-grid system: one or more VE.Bus inverter/chargers, a battery bank, DC distribution, DC charging sources, and a GX device for monitoring. In a Victron Microgrid, multiple Power Banks connect to a shared AC bus and work together as one large power system.
Load sharing between units happens automatically via AC voltage and frequency, without the need for a central controller, communication between power banks or complex configurations. This decentralised approach keeps the system simple and reliable. Three-phase and split-phase configurations are supported as well.
Independent charging – no central controller needed
Decentralised DC charging is what makes this controller-less approach work. Each Power Bank manages its own state of charge using its own charging sources. Victron supports a range of charging options:
- MPPT solar charge controllers for DC-coupled PV
- AC chargers (such as MultiPlus, Quattro or Multi RS) connected to an AC generator or other AC supply, independent of the Microgrid AC bus.
- DC generator integration (including start/stop automation)
Getting started
Victron Microgrid is available via a dedicated VE.Bus firmware for MultiPlus, MultiPlus-II, Quattro and Quattro-II. Walk through the concept, configuration and commissioning with these training videos:
The Technical manual covers installation and configuration in detail. See this Slide deck for a more visual overview. Contact a Victron distributor to discuss whether Victron Microgrid fits your application.
