12A MPPT charger 55V max PV input 12V or 24V battery output Arduino-compatible (ATmega 328P used) Expandable via break-out of unused ports to standard 2.54 pin-pitch headers (e.g. used for display, ...

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 ...

There are three different buttons/options: State, in which the circuit operates as a maximum power point tracking solar charge controller driving a 2V LED load. The circuit enters this state when the ...