Helios estimates plug-in solar output for any UK address

Ruaraidh built Helios, a tool that calculates how much electricity a plug-in solar panel could realistically generate at any address in Britain, based on location-specific data. It's a practical, self-contained utility that fills a real gap — most solar estimators are either too generic or gated behind sales funnels. Useful for renters and homeowners weighing whether a balcony or window panel is worth the upfront cost.