The SunGuard is the little brother of the SunSaver and it is only available in a 12v version with a 4 amp capacity. It is also a PWM controller with temperature compensation and simple 4 wire hookup. The SunGuard has a slightly lower output voltage (14.1) than the SunSaver and ProStar and may not be the best choice for flooded batteries that require a little higher voltage. Five year warranty.