Nature Power 60028 28-Amp/455-Watt 12-Volt/24-Volt Digital Solar Power Charge Controller Provides protection to your batteries from overcharging from 12-volt solar panels Can handle up to 450-watt or 28-amp from a solar array Pwm control provides higher charging efficiency Digital display and led lights help to monitor your solar power system let you know the charge level of your battery at all times, no surprises Dedicated load terminal prevents dead batteries and adds another level of protection for your battery