A few years ago, [Lukas Fässler] needed a solar charge controller and made ... An MPPT (Maximum Point Power Tracking) charger is a smart unit optimized to handle all these changing conditions ...

and use a solar charger attachment that produces enough power to prevent the battery from ever fully draining. The battery power options for smart doorbells like those made by Ring is already the ...

Most solar chargers come with a reverse charge blocking ... “My preference is a smart battery maintainer,” says John Ibbotson ...