The Samlex SCC-30AB is a 30 amp flush mount RV solar charger controller. Solid state controller uses Pulse Width Modulation and is programmable for different battery types, Complete with LCD display this four stage RV solar charge controller features include 8 charge settings for different battery types, battery equalization option, and is for use with either 12V or 24V system - (automatically detects). LED status lights indicate which of the 4 charging stages your batteries are in. This controller can operate up to 500 watts of solar power. 5 year manufacturers Warranty.