External Battery Charger factory Model: NPP-450 / NPP-750 / NPP-1200 / NPP-1700 Wattage: 450W~1700W Features: Meanwell Inverter Charger 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) -30 ~+70oC wide operating temperature, minimized environmental limitations Protections: Short circuit, over voltage, over temperature Optional hand carry handle (Order No.: Carry Handle), Meanwell Inverter Charger Comply with UL/EN 62368-1 and IEC/EN62368-1/-2-29 dual certifications 3 years warranty Q: Suggestion for select suitable LED power supply? A: If LED system is based on direct drive, units with adjustable voltage and current should be considered for flexibility in changing voltage/current levels. Dimming function may also come in handy when LED brightness control is preferred. Q: Can MEAN WELL IP67 products exposed to open field? A: Please check if the IP67 is equipped with ADJ function or not. Due to the mechanism design of potentiometer for IP67 products, the protections are not as perfect as BLANK type. Therefore, please choose BLNK version when application is not sheltered. Q: What is the warranty for your Power Supply? A: 2 ~ 7 years based on different series.External Battery Charger factory website:http://www.jiangglobal.com/ac-dc-power-supply/external-battery-charger/