BatteryTruth
Load dataConfirm tariffCheck a quote

Check an installer’s claim

Type in what you were quoted. The same battery gets run against your own half-hourly data and your confirmed tariff, and you get the two numbers side by side with a plain explanation of any gap.

The quote

The nameplate size on the quote.
What you would actually pay, after any rebate already deducted.
Quotes often state this separately and it is lower than nameplate.
What they claimed

Fill in whichever the quote gives. If it gives neither, you still get a modelled figure — there is just nothing to compare it against.