Solar Charge Controller MPPT 30A Model : XTRA 3210N ( XDS2 ) Nominal system Voltage : 12V/24V Auto work Rated charge current : 30A Rated discharge current : 30A Max. PV open circuit voltage : 100V Battery input voltage range : 8V~32V Max. PV input power : 390W ( 12V ) 780W ( 24V )