CN3722 MPPT Solar Panel Battery Charge Controller

:Specifications Input voltage 18V nominal solar panels (no load about 21V solar panels) Output voltage Output voltage: 2-4 series lithium battery or lithium iron phosphate battery (can be adjusted by external resistance) Output current maximum constant current 3A (Charge current > 2A, please add heat dissipation) Wiring method Welding plate IN + input positive IN – input negative (SOLAR) BAT+ battery positive BA- battery negative Size 45* 31mm/1.92*1.22inch