Y-SOLAR 10A/20A/30A/40A LCD Dual USB Solar Charge Controller 12V/24V Auto Switch With Light Timer Control (30A) Build-in industrial micro controller,Big LCD display,all adjustable parameter. Dual mosfet Reverse current protection,low heat production. The controller has a low failure rate and will last a long time and protected with moisture-tight coating, minimizing damage from humidity and from nesting insects. Build-in short-circuit protection,open-circuit protection,reverse protection,over-load protection. Easy to set up and operate. Suitable for home, industrial, commercial, boat, car etc.