The SC1220LD 20A Charge Controller ensures that you do not overcharge or discharge your battery when charging it from your solar panel. Regulated output prevents batteries from overcharging. Load Disconnect (LD) protacts batteries from being over-discharged.20A Amp CapacityFor 12 Volt solar panels and batteries systemsSelectable battery typeDesigned for solar panels <340WLoad Disconnect version to protect batteries from being over-dischargedEasy to read indicatorFeatures temperature compensation and reverse polarity protectionSpecifications Battery Voltage: 12V DC Max.PV panel open-circuit voltage: 26V DCMax. Charge Current: 20AMax. Load Current: 20A, 40A for one minuteOperational Draw (no load and no PV): <10mARegulated Battery Charging Voltage: Flooded-14.6V DC, Sealed-14.2V DCVoltage Across Terminal (PV to battery): <0.15V DCVoltage Across Terminal (battery to load): <0.10V DCPV Reverse Polarity Protection: YesBattery Overcharge Protection: Flooded-14.6V DC, Sealed-14.2VDC Load Discharge Protection: <11.5V DCBattery Charger Stages: Two-teps, Bulk, FloatRecommended Wire Size: #10 AWGOperating Temp: -40C to 60C