A typical 3-bedroom home needs a 5–10kWh battery. If you want to run your home through the night from solar or cheap grid electricity, 10kWh is the minimum to consider.
🏠Homeowner view
Battery size is measured in kilowatt-hours (kWh) — how much energy it can store. A typical household uses 8–12 kWh of electricity per day. But you don't need to store a whole day's use — just enough to bridge the gap between when you generate (or when electricity is cheap) and when you need it most. For most homes with solar panels, a 5–10kWh battery is the right size. A 5kWh battery costs around £2,000–3,000 installed and suits a smaller home or one with modest daytime usage. A 10kWh battery (most popular) costs £3,000–5,000 installed and suits most 3-bedroom houses. A 15kWh+ battery is for larger homes, homes with EVs to charge, or those wanting full evening backup capability. Batteries can often be expanded later by adding modules — check whether your chosen system supports this before buying.