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I don't understand why this charge controller displays fully charged battery on sunny days but the battery drains so quickly upon loading with 4 dc lamps 3watts each. The battery capacity is N70. Solar capacity is 40 watts. Let me also know if my charge controller is connected properly.

I have installed a 40watt panel with Solar Charge Controller PWM,12V/24V 10A,12V/24V 20A,12V/24V 30A and a 12v 75ah new Chloride exide free maintenance car battery. Despite limiting my usage to four 3w dc lamps for lighting between 6.30pm to 7.00 am the battery is low (red indicator in charge...