... key to set the second work period, you can set the time of 1-15 hours, 8h+4h+2 h+1 h= ... red light indicates less battery power.6. Light green light that lighting condition.7. Light Orange blinking indicates the solar panel voltage. ... half of fuzzy control using PWM charge, a substantial increase the charging efficiency, greatly increase working time7 over charge, over discharge, overload, short ...