2 in 1 models With High Efficiency And Good Value (Charger and Power Supply) NPP-450 NPP-750 NPP-1200 NPP-1700 Can easily switch between charger and power supply 3 stage charging, only suitable for lead-acid batteries Charging voltage adjustable through panel [10.5~21V, 21~42V, 42~80V, 54~100V(NPB-450 only)] Charging current adjustable through panel (50~100% of rated current)