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 ...

The BougeRV 40A MPPT Solar Charge Controller features remote app control, LCD display, and multi-voltage compatibility. This charge controller provides efficient solar charging for various battery ...

The backstory on [Tim O’Brien]’s DIY off-grid PV system starts with his desire to charge his ... compatible off-the-shelf MPPT, or maximum power-point tracking, controllers are expensive.