MultiPlus II
Compact inverter/charger with VE.Bus control, strong charger current for battery recovery, and proven integration with Venus OS, DVCC, and modern lithium BMS signalling.
Victron + Fronius Micro-Grid Design
Off-Grid Systems and AC-Coupled Micro-Grids
When the grid is absent, unreliable, or you want full site energy autonomy, we engineer around a Victron VE.Bus inverter/charger core, DC-coupled PV via high-power MPPT chargers, optional Fronius GEN24 AC-coupled solar, and battery banks sized to your overnight and backup loads.
Victron hub
MultiPlus, Quattro, and High-Current MPPT Solar Chargers
Victron MultiPlus II and Quattro units act as the AC-forming inverter/charger at the heart of many off-grid and islandable sites. Quattro adds dual AC inputs (for example grid plus generator) and split-phase options where your site needs it. Parallel and three-phase scaling is available for larger bus and farm loads.
Quattro
Step-up when you need two AC sources, higher power classes, or split-phase delivery. Common choice for rural homes, workshops, and dairy support loads where sequencing between grid, generator, and battery matters.
RS MPPT solar chargers (e.g. RS 450 class)
Victron SmartSolar MPPT RS chargers suit large PV strings onto the DC battery bus with high PV voltage capability and remote monitoring. Ideal when you want a large DC-coupled array alongside—or instead of—AC-coupled Fronius PV.
How we use Victron in a typical micro-grid
Battery + BMS coordination
Battery voltage and charge limits are matched to your selected BMS and battery brand, including DVCC where applicable.
Generator logic tuned to your site
Auto-start, quiet hours, and minimum SOC rules are programmed around how you actually run the property day to day.
Fronius AC-coupling verified first
ESS-style AC coupling with Fronius is model and firmware dependent, so we confirm compatibility and control strategy before lock-in.
Battery options
BYD LVS, Freedom Won, and SIMPO-5000 Pathways
Battery chemistry, voltage class, and BMS integration drive inverter settings and warranty outcomes. We match BYD Battery-Box LVS low-voltage cabinets, Freedom Won eTower lines, or SIMPO-5000 class banks to your Victron design once daily kWh, peak kW, and temperature exposure are understood.
Photography may show related BYD cabinet families; your written proposal lists the exact Battery-Box LVS configuration and Victron integration path.
BYD Battery-Box LVS
Low-voltage lithium expansion in modular towers, widely used in Victron-led designs where certified DVCC integration and clear comms wiring matter. Final module count follows your depth-of-discharge and backup hours targets.
Freedom Won LiTE2 Home 15/12 (Indoor)
Indoor Freedom Won LiTE2 Home 15/12 storage with a strong track record where quality and serviceability are priorities. Sizing ties to inverter charge limits, C-rate expectations, and whether the site is off-grid full-time or backup-first.
SIMPO-5000
Where SIMPO-5000 fits your voltage and BMS profile, we integrate it into the same Victron supervision model with clear charge/discharge envelopes and alarm handling.
AC-coupled PV
Fronius GEN24 in AC-Coupled Micro-Grid Roles
A Fronius GEN24 Primo or Symo can operate as AC-coupled PV on the same micro-grid as Victron, subject to firmware, power limits, and frequency-watt control settings. This path suits customers who want a premium PV inverter with strong monitoring while Victron handles battery, generator, and critical AC bus formation.
GEN24 as controlled PV source
We set up GEN24 so production respects battery state of charge and site demand, aligned with Victron control and any export limitation you require.
Hybrid-ready where it helps
Where a hybrid pathway simplifies future grid connection or backup expansion, we map Fronius and Victron responsibilities so you are not double-paying for the same function.
Surplus energy use
On suitable sites, Ohmpilot can divert excess solar into hot water or thermal loads, lifting self-consumption even when the primary story is off-grid resilience.
AC coupling rules change with firmware and region. We confirm the exact GEN24 + Victron pairing for your project before build.
Ground mount
Clenergy SolarTerrace™ II-A Pre-Assembled Ground Mount
Where roof space, orientation, or structural loading pushes PV to the ground, Clenergy SolarTerrace™ II-A offers a pre-assembled ground mount system aimed at faster site assembly and consistent rail geometry. We engineer array size, row spacing, and foundation detail for your soil, wind zone, and panel choice.
- Pre-assembled frames reduce on-site labour compared with fully stick-built racks.
- Suitable for large residential, farm, and light commercial DC arrays feeding Victron MPPT or string inverters as designed.
- Tilt and azimuth can be optimised for winter yield when summer clipping is acceptable.
Design inputs
What We Need to Size an Off-Grid System Properly
| Topic | Why it matters |
|---|---|
| Load inventory | Peak kW sets inverter class; daily kWh sets battery energy; motor starts set surge headroom. |
| Generator | Fuel type, auto-start, and acceptable run hours influence Quattro input wiring and battery charging strategy. |
| PV yield | DC MPPT string design versus AC-coupled Fronius kW affects harvest shape, especially in poor sun weeks. |
| Future grid | If mains may arrive later, we leave a clean architectural path so you are not ripping out core hardware. |
Book an Off-Grid or Micro-Grid Assessment
Share your site details and run the quick future load calculator below. The calculated load result is included in your enquiry so we can size your system faster and more accurately.