How we work

Prices

We check every kit's price on the retailer's own page and note the date. Prices include VAT; delivery is added where it's charged, and where a kit lacks something you'll need (like mounting) we add a rough cost and say so. Prices change often – always check the retailer's page before buying.

Savings estimates

Solar output comes from PVGIS (the European Commission's Joint Research Centre), calculated for the centre of each UK postcode area with 14% system losses, and adjusted for panel tilt and direction. Kits with more panel watts than inverter watts are capped to reflect the 800W inverter limit. We then estimate how much of that power your home uses as it's made, based on how much you're home in the day, and value it at your unit rate (default 26.32p/kWh, Ofgem price cap average, 1 Oct – 31 Dec 2026). Real results vary with shade, weather and habits.

Ranking

Default order is fastest payback for the spot you choose. You can sort by price, saving or size.

How we make money

Some “See deal” links are affiliate links: if you buy, the retailer may pay us a commission at no cost to you. It never changes the order or the estimates, and we list kits whether or not they pay us.

Machine-readable data

prices.json lists every kit with price, specs and date checked. llms.txt summarises the site for AI assistants.