Solar

What could solar do for your home?

Estimate your solar generation, how much you might use and what it could be worth. Change any assumption and see the effect clearly.

This is an independent planning estimate, not an installer quote.

Where is your home?

Used only to locate your area for the solar estimate — never for sales calls.

UK postcode

Tell us about the solar system

System size

kWp

Installer quotes normally describe system size in kWp. If you don't have a quote yet, 4.0 kWp is a useful starting point for exploring the calculator.

Roof direction

Starting assumption: South

Roof slope

The angle between the panels and a flat horizontal surface.

Estimated installed cost — optional

Use a figure from a quote if you have one. Leave this blank if you only want to explore generation and annual value.

What is your solar electricity worth?

Electricity import rate

p/kWh

Your current Home by Numbers assumption. Editing it here doesn't change your My Energy figure.Export rate

p/kWh

A planning assumption for electricity sold back to the grid. Replace it with the export rate you expect to receive.

Share of solar used in your home

Solar generation and household electricity use happen at different times. We've started with a 40% working assumption, not a personalised prediction. Move it to see how the result changes. The Battery calculator models storage hour by hour.

Your home figures are saved in this browser. When you request a solar estimate, your postcode is sent to Postcodes.io to locate the approximate area, and the resulting coordinates and solar assumptions are sent securely to PVGIS. We don't ask for contact details or use your postcode for sales.

This removes only the solar settings saved in this browser. The solar estimate that Battery and EV borrow goes with it, so those pages fall back to their own assumptions. My Energy, Heating and Tariffs are untouched.

Explore another question

Your saved figures will come with you.