I have collected 3 days of voltage samples across the battery bank. It can be seen clearly that during the day, the battery voltage rises due to the sun shining onto the solar panels, thus charging the batteries.
At night, we use the ceiling fans and security lights at the compound. You can see the battery voltage is dropping due to the battery discharging its energy.
The first night we over used the ceiling fans, we turn on all 4 fans. It cause the battery to discharge to much, shutting down the security lighting in the middle of the night because the charge controller senses a low battery voltage. One fan was switched off at about 3am and the battery voltage recovered a bit.
The next 2 days, we were able to manage our electricity better and there was no shutdown of the system. We uses only 3 ceiling fans for the night.
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