Morningstar SG-4 SunGuard 4.5 Amp Regulator, 12V

The SunGuard™ is a single module, compact PWM solar charge controller for small systems, ideal for both professional and consumer use. With SunGuard, there’s no reason not to insist on Morningstar quality with any system design—no matter how small.

“Rock solid, potted so waterproof, long track-record…great charge controller for a small system”