Inside, he’s siliconed a 15AH, 12V lead-acid battery in the centre ... he laser-cut the top panel from 1/8″ plywood and secured a 20A solar charge controller, a four-in-one socket panel ...
A few years ago, [Lukas Fässler] needed a solar charge controller and made his own, which he has been improving ever since. The design is now mature, and the High Efficiency MPPT Solar Charger ...