The Morningstar SunGuard 4-12V, 12 volt, 4.5 amp charge The MorningStar SunGuard is a fully epoxy encapsulated outdoor rated 4.5A "ice cube" sized 12V PWM charge controller. It has built-in temperature compensation, lightning protection and easy 4-wire hookup. The SunGuard's regulation voltage is set at 14.1 (best for sealed or gel batteries) and is not adjustable for battery type like MorningStar's other controllers. It's dimensions are 2.5" x 2.0" x 1.5" and it weighs just 3 oz. Standard Controller Features Temperature compensation High level of lightning protection Computerized production testing Ambient temperatures of -40° C to + 60° C Expected 15 year life Parallel capability for higher current ratings Easy to use Constant voltage, PWM series charging Reverse current protection (at night) ISO 9002 manufacturing High efficiency, low self-consumption Tropicalization: Epoxy or conformal coating Five year warranty No need to derate - 25% design margin