10a 20a 30a lcd pwm solar panel charge controller battery regulator 12v/24v with dual usb

1.adopting industrial master chip. 2.lcd display. 3.charge and discharge is available.its parameters can be adjusted by yourself. 4.fully 4-stage pwm technology works for it. 5.short-circuit protection, open circuit protection and reverse polarity protection. 6.automatic recovery program. 7.with double mos, calorific value is low.