XTRA series are advanced maximum power point tracking (MPPT) charge controllers, for off-grid photovoltaic systems, with optional display units (XDB1/XDS1/XDS2). In order to maximize the energy harvest from PV arrays and simultaneously minimize the power loss within a wide range of operating conditions. Model : MPPT XTRA 4210N-XDS2 Nominal system Voltage : 12V/24V Auto work Rated charge current : 40A Rated discharge current : 40A Max. PV open circuit voltage : 100V Battery input voltage range : 8V~32V Max. PV input power : 520W ( 12V ) 1040W ( 24V ) IP33