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Single-phase or three-phase: which SOFAR system fits?
Most UK homes have a single-phase supply, but larger homes, farms and businesses often have three-phase. Here is how that affects your choice of inverter.
How to tell which supply you have
Most UK homes have a single-phase supply. Three-phase is more common on larger properties, farms, and commercial buildings. A three-phase supply usually has three main fuses and a three-phase meter. If you are not sure, an installer can check during a survey.
SOFAR options for a single-phase home
- PowerAll single-phase (ESI 3–6K-S1) — all-in-one inverter and stackable battery
- HYD-EP and HYD-LS1-PRO hybrid inverters — solar plus battery
- TL-G3 and KTLM-G3 solar inverters — solar only, with KTLM-G3 offering two MPPTs for split roofs
SOFAR options for a three-phase property
- PowerAll three-phase (ESI-T1, 5–12 kW) — all-in-one storage
- HYD KTL-3PH and HYD-LT1 hybrid inverters, 5–20 kW
- KTLX-G3 solar inverters from 3.3 kW
Connecting to the grid
Any system that can export has to be registered with your local electricity network operator (DNO). Smaller systems — up to 16 A per phase, roughly 3.68 kW on a single-phase supply — are usually connected under the G98 process, where the installer notifies the DNO after installation. Larger systems fall under G99, which needs the DNO's approval before installation. Your installer handles this paperwork.
Products in this guide
FeaturedSOFAR PowerAll (single-phase)
All-in-one solar + storage · 3–6 kW · 5.12–30.72 kWh
PowerAll combines a SOFAR ESI hybrid inverter with stackable BTS 5K LiFePO4 battery modules. Start with one battery and add more later — up to six — mixing new modules with existing ones. The battery is physically and electrically isolated from the inverter, the system is IP65 rated, and it can stand on the floor or hang on the wall.
Learn moreSOFAR PowerAll (three-phase)
All-in-one storage for three-phase homes · 5–12 kW
The three-phase PowerAll uses the ESI-T1 hybrid inverter with the same stackable BTS 5K battery modules as the single-phase system — for larger homes and small businesses with a three-phase supply.
Learn moreSOFAR HYD KTL-3PH
Three-phase hybrid inverter · 5–20 kW
A three-phase hybrid inverter supplied with a smart meter. The 10–20 kW models take two batteries, and the range can control the SOFAR 11 kW wallbox.
Learn more