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 ...

Solar power ... happened upon a 450W PV panel on the cheap. Sadly, the panel was a commercial unit, and compatible off-the-shelf MPPT, or maximum power-point tracking, controllers are expensive.

The proposed inverter design, with battery backup, relies on a maximum power point tracking (MPPT) solar charge controller based ... and current of the solar panel in 60 seconds and the Boost ...