Backcast
Would that solar & battery quote actually have paid off?
Backcast replays a whole year of your own real half-hourly smart-meter data against a simulated version of the system you’ve been quoted — not a generic “average UK household” estimate. It tells you plainly whether the price is fair and what the system would honestly have saved you.
Takes about 5 minutes. Full report is £9 if you want to unlock it.
Your evenings are usually your biggest cost, and the gap between what you use and what solar gives you — that gap is exactly what a battery is for.
Your real usage
We use your actual Octopus smart-meter history, half-hour by half-hour, for the last year.
An honest verdict
We’ll say a quote is fair as readily as we’ll say it’s oversold. No installer pays us to say either.
Plain English
No jargon, no sales pitch — the numbers, the assumptions behind them, and what they mean.