Solar battery calculator

See whether adding a battery to solar panels could save more.

Do you already have solar?

How much electricity does your home use?

Are you usually home during the day?

Answer the first question to see your estimate.

Working out sunlight for this location…

Change assumptions

Annual electricity use (kWh)Solar system size (kWp)Import electricity rate (p/kWh)Export rate (p/kWh)Battery size (kWh)Installed battery cost (£)From a quote

How this estimate works

We estimate how much of your solar electricity you use as it is generated, how much a battery could store for the evening, and how much would be exported.

Being home in the day means more solar is used directly, which leaves less for a battery to add. Batteries lose a little energy when charging and discharging, and are more useful in summer than winter.

Electricity you use saves the import rate; exported electricity earns the export rate. Without a postcode, sunlight is based on central England with an east/west roof.