November 17, 20241 yr Woke up this morning and the inverter is drawing a lot of power from the municipality. WTF happened to my battery? Went from 80% to 2% before 5am? No increased load. System is 3 months old. Sunsynk battery and inverter. Edited November 17, 20241 yr by Paulbloggs
November 17, 20241 yr Looking at the voltage graph it seems like the battery was flat to start off with, round about 48v at 12 midnight
November 18, 20241 yr Author 18 hours ago, I84RiS said: Looking at the voltage graph it seems like the battery was flat to start off with, round about 48v at 12 midnight SOC was 80% up until just before 4am. No power or current draw before that? Edited November 18, 20241 yr by Paulbloggs
November 18, 20241 yr Soc was likely already at 0% given the voltage reading, explaining the suddend drop/correction in SOC just before 4am when current was pulled from the battery. In other words the 80% SOC reading was incorrect. When last did you charge to 100% and left the cells to balance ?
November 21, 20241 yr Author On 2024/11/18 at 8:52 PM, I84RiS said: Soc was likely already at 0% given the voltage reading, explaining the suddend drop/correction in SOC just before 4am when current was pulled from the battery. In other words the 80% SOC reading was incorrect. When last did you charge to 100% and left the cells to balance ? Looks like the voltage was dropping for a few days before. I do not have enough solar to fully charge the batteries - that is in the pipeline. Is there a way of forcing a 100% charge automatically - say once a week or so?
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