Solar, batteries, EV charging and heat pumps. Plain-English guides, working calculators and honest opinion. No affiliate links, no installer commissions, no postcode forms.
42
in-depth reference guides
12
calculators that show their working
0
affiliate links across the whole site
100%
independent of installers and suppliers
Tools & calculators
Drop in your real inputs, watch the working update. No round numbers, no marketing-friendly outputs and no postcode form that sends your details to an installer.
Roof orientation, shading, tariff and behaviour. Year-by-year breakdown with assumptions visible.
Try it →Match capacity to your evening load shape, not a marketing-friendly round number.
Try it →Smart-tariff overnight charging compared against standard rates and an ICE equivalent.
Try it →A rough check on the survey number your installer is quoting. Useful for spotting an oversized quote.
Try it →Guides & reference
Independent UK reference guides for the four pillars of a modern home. Plain English, technically honest, willing to be wrong out loud and update.
Panels, inverters, microinverters and mounting. What the spec sheet really tells you.
Sizing, chemistry, hybrid systems, payback and virtual power plants.
Home chargers, smart tariffs, load balancing and public network reliability.
Air source, ground source, the survey, the radiator question and the BUS grant.
Long-form pieces that explore questions our reference guides cannot.
Working calculators for payback, sizing and running cost.
Deep dives across solar, battery, EV charging and heat pumps. Everything you would want to know before, during and after installing.
Articles & opinion
Real experience from a real customer. We show our working and update our conclusions when the evidence moves.
A 4 kWp roof in Surrey, a 5 kWh battery and a year of half-hourly meter data. We changed our mind twice.
Three differences that matter, seven the marketing pages want you to weight.
A semi in West Yorkshire. The 14 kW survey was wrong. Here is how to tell when yours is.