Address-Level Yield Estimator for Plug-In Balcony Solar in the UK and EU
Helios computes what plug-in solar would generate for any British address using national LIDAR data and reached 126 points on HN. The top request was extending it to regular rooftop arrays, and a sharp comment exposed a false-precision failure when building footprints are missing. Plug-in solar just became legal in the UK while installers and retailers lack an address-accurate sizing tool to convert hesitant buyers.
Problem Statement
A household considering a 500 watt plug-in kit today gets generic payback claims from retailer marketing. Shading from the building opposite, balcony orientation, and latitude swing the answer by a factor of three. Surveyor visits cost more than the kit itself, so retailers either oversell and disappoint or undersell and lose conversions.
The Idea
A LIDAR-backed solar yield API and widget for balcony solar retailers and installers who need address-specific generation estimates at point of sale.
Why Now
Britain legalized plug-in balcony solar in 2026, following Germany where registered Balkonkraftwerk installations passed the million mark. Retailers selling kits online have no UK-specific way to answer the only question buyers ask, which is what the panel will actually generate on their balcony.
Target User
Balcony solar kit retailers, installers, and energy suppliers selling plug-in kits in the UK and Germany
Target Market
Residential solar e-commerce conversion tooling
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