Sigenergy, Tesla or SolarEdge. How each system works.

We fit all three. They all turn daylight into power for your home, but they go about it differently. Pick a system, then tap a glowing dot to see what each part does and what it means for you.

Side by side

The same questions asked of all three, for a typical home on a single-phase supply. Figures are the makers' own, for the models sold in the UK.

Swipe the table sideways to see all three.

Question
The kit
How it is built	One stack. The inverter sits on top, with the car charger and batteries clicking in underneath.	One unit. Powerwall 3 is a battery with the solar inverter inside.	An optimiser under every panel, an inverter on the wall and a separate battery.
Inverter size	3 to 12 kW, in nine sizes.	Set by us anywhere from 3.68 to 11.04 kW.	One unit, set by us anywhere from 2.2 to 10 kW.
Roof faces it can handle	2 separate solar inputs up to 6 kW. 3 or 4 on the bigger sizes.	3 separate solar inputs, up to 20 kW of panels.	No limit that matters. Every panel has its own optimiser.
Shaded or awkward roofs	Works with Tigo optimisers. When we use them, we fit one to every panel.	Powerwall 3 does not work with panel optimisers on its own solar inputs. Best on a clear roof.	Its strong suit. Each panel is tuned on its own, as standard.
The battery
Storage per battery	5.84 or 8.76 kWh usable per module.	13.5 kWh usable.	9.7 kWh usable.
Adding more later	Up to 6 modules in one stack, about 52 kWh.	Up to 3 Expansion units of 13.5 kWh, or more Powerwalls. Up to 94.5 kWh in all.	Up to 3 batteries on one inverter, 29.1 kWh.
Where it can live	Inside or outside, on the floor or the wall. Rated IP66, down to -20°C.	Inside or outside, on the floor or the wall. Rated IP67, down to -20°C.	Inside or outside, on the floor or the wall. Rated IP55, down to -10°C.
Adding to solar you already have	Yes. It can replace your old inverter or sit beside it.	Yes. Powerwall 3 can sit beside an existing solar inverter.	Yes, on an existing SolarEdge system with a compatible inverter.
Power cuts
What you need for backup	Sigen Energy Gateway HomePro.	Tesla Backup Gateway 2.	SolarEdge Home Backup Interface.
What stays on	The whole house, through a 100 A gateway.	The whole house or chosen circuits. On a three-phase supply, one phase only.	The whole house or chosen circuits.
How fast it switches over	0 milliseconds on the data sheet, as long as the house isn't using more than the inverter can supply.	Not published. Tesla call it quick.	Under 3 seconds. The lights blink.
Works with a generator	Yes. The gateway has a port for a generator and can start it.	Not confirmed for the UK.	No.
Charging a car
The charger	DC module in the stack, up to 12.5 kW, or 25 kW with a paid upgrade. Or the 7 kW EV AC Charger 2.	Wall Connector, 7.4 kW AC, or 22 kW on three-phase.	SolarEdge ONE EV Charger, 7.4 kW AC, with PEN protection built in.
Charging from your solar	Yes, with either charger. The DC module takes power straight from the panels and battery.	Yes, with Charge on Solar. It needs a Powerwall and a Tesla car.	Yes. It uses spare solar and plans charging around cheap rates.
Car powering the house	The hardware is built for it, but it depends on the car. We don't promise it yet.	Not available in the UK.	Not available in the UK.
Living with it
The app	mySigen. Live power flows, updated every 10 seconds.	The Tesla app. The same one as the car.	mySolarEdge. Shows what each panel is making.
Cheap-rate tariffs	AI mode plans charging around your tariff, your habits and the forecast.	Savings mode charges on cheap rates. Storm Watch fills the battery ahead of Met Office warnings.	SolarEdge ONE plans charging around time-of-use and changing tariffs.
Maker's warranty	Inverter and battery 10 years. Gateway 5 years. Car charging module 3 years.	Powerwall 10 years.	Optimisers 25 years. Inverter 12 years. Battery 10 years. Car charger 3 years.
Three-phase supplies	Yes. Three-phase inverters from 5 to 30 kW.	Powerwall 3 is single-phase. On a three-phase supply it connects to one phase.	Yes. Three-phase inverters of 5, 8 and 10 kW.

Checked against the makers' data sheets and UK websites in October 2026. All three makers need the system kept online for the full warranty. Products change, so we confirm every detail in your proposal.