Tracer 1215bn 10amp Mppt Solar Charge Controller 12v 24v with Auto Switch 12v/24v DC Solar System Voltage Auto Work Max. solar input voltage 150VDC Max. PV input power Tracer1215BN 130W(12V) 260W(24V) 99% High Efficiency Mppt Tracking Support 4 charging options: Sealed, Gel, Flooded and User-defined