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 battery systems we install from Tesla, Fox ESS, Sigenergy, and Hanchu (hybrid inverter + battery) are designed for 6,000–10,000 charge cycles, which translates to 15–25 years of daily use. Our up to 15-year 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.