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 ...

SMART SOLAR CHARGE CONTROLLER: Solar charge the smart way with the Victron Energy SmartSolar MPPT charge controller, to ensure that every ray of available sunlight is converted into usable energy ...

The original attempt used a PiJuice hat and solar panel. This time, the design didn’t use these, opting instead for a LiFePO4 battery, a solar regulator, and a solar panel. The rest of it comes ...