Flexzion MPPT Tracer 3215RN Solar Charge Controller Battery Panel Charging Regulator Auto Work 12/24V INPUT 30A Maximum PV Input Power 390W(12V), 780W(24V) Peak conversion efficiency of 97 %; High Tracking efficiency of 99%; Several seconds tracking speed Very fast Sweeping of the entire I-V curve; 4- Stage charge with PWM output; Temperature compensation function Full power output in ambient temperatures up to 45 degree; Sealed, Gel, Flooded battery type optional ON/OFF, Dusk to dawn, 1-15h timer Excellent thermal design and nature air cooling; CE certificate