My SmartSolar MPPT turns the solar charge off twice per day if I am consuming power during the day this drives my battery down to nearly empty without the charge kicking back in to compensate - I have written off 2 batteries like this. I don’t understand why does the charge suddenly drop before the battery gets to float state anyway and why doesn’t the charge kick back at some point to lift the battery state back up before the battery is killed?
in the 2 photos attached I’ve shown solar power and voltage against battery voltage.Overnight the night before I plugged the battery into a mains charger that took the battery to 13+ volts when I unplugged that the battery voltage dropped to 12.7 volts as the solar was kicking in which lifted the battery voltage back up - so far so good. Then the charge suddenly drops as there was no load on the battery it stayed at a decent voltage all day but still no charge until @5pm when we get a small blip that then drops. So any ideas why I get the same sudden drop twice a day? As this is the second battery in 2 years I can’t see how the battery is to fault?
