... 1. Control using common positive polarity way, accepts 2 lines input of solar array.2. LCD equipped (backlighting) to show parameter of system ... local agent before installation, which should be guided by professional.2. Prevent any liquid from spattering on controller. Do not clean ... as possible, including DHL, UPS, TNT, Fedex and EMS. 2.4KW 48V Solar Charger Controller, PWM 50A Solar Controller