Which Battery Is Right for Me

The right battery depends on how much you generate, how much you consume in the evenings, whether you have an EV, and what inverter you already have. Capacity, compatibility, and warranty terms matter more than brand name.

Capacity: how big do you need?

The average UK home uses around 1.5–2 kWh of electricity between 6pm and midnight. A 5 kWh battery covers that comfortably with headroom. If you charge an EV at home or have electric heating, a 10–15 kWh battery makes more sense. Bigger is not always better — an oversized battery that rarely reaches full charge cycles less efficiently over time.

Popular options in the UK market

• Givenergy All-in-One — compact hybrid inverter and battery combined; 5–22 kWh scalable; good monitoring app; strong UK support
• SolarEdge Home Battery — DC-coupled, high efficiency; best paired with a SolarEdge inverter; 9.7 kWh modules
• Tesla Powerwall 3 — 13.5 kWh; integrated inverter; excellent app; premium price
• Solis Hybrid + Pylontech — popular combination for retrofits; modular capacity; competitive pricing

Inverter compatibility

If you already have solar, check whether a new battery is compatible with your existing inverter before committing. Mismatched systems sometimes require an additional inverter, adding cost. We assess compatibility at the survey stage.

When we would not recommend adding a battery

If you are rarely home in the evenings, work away for long stretches, or your panels are already undersized, the battery will not charge fully enough to justify the cost. Improving the solar array first gives a better return in those cases. A battery on a poorly sized solar system is a poor investment.