Calculator
What should I install first?
Start with a quick estimate — about a minute. Add more information only if you want a more personalised result. You do not need your tariff, your bills or any smart-meter data to get a first answer.
Illustrative prototype — do not use this to make a purchasing decision
This prototype demonstrates the WattFirst planning experience using illustrative, unverified assumptions. Do not use it to make a purchasing or financial decision.
Step 1 of 4 — Your home
Your home
Two or three details about the property.
The first part only, for example L40 or NG7. This will eventually support regional solar and tariff data. We do not ask for your full postcode.