Tesla Powerwall 3

While solar panels work without a battery, adding one significantly increases your energy savings. Without a battery, you only use solar electricity when the sun is shining and your panels are generating. A battery stores excess daytime energy for use in the evenings when electricity is most expensive. Most households use 50–70% of their solar generation with a battery, compared to 30–40% without one.

Modern lithium-ion solar batteries typically last 10–15 years or more. The batteries we install from Tesla, Hanchu, Fox ESS, and Sigenergy are designed for 6,000–10,000 charge cycles, which translates to 15–25 years of daily use. Our lifetime warranty on batteries gives you complete peace of mind.

Yes, if you have a hybrid inverter and battery system. During a power cut, a hybrid system can disconnect from the grid and power your essential appliances using stored battery energy. Not all systems offer this — it depends on the inverter type. Our team designs systems with backup capability if this is important to you.

Battery size depends on your energy usage and solar panel system. A typical UK household uses 8–10kWh per day. A 5kWh battery covers evening usage for most smaller households, while a 10–14kWh battery provides more independence and better backup during outages. Our free survey includes an analysis of your energy usage to recommend the right battery size.