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menneer asked

SoC spiking up and down

Last night I set a scheduled charge to 60% ending at 05:30, but woke up to find the batteries at 25%.

Then the sun came out and they seemed to be charging very slowly. But then, mid-afternoon, one minute they were at 69%, literally a minute later at 100%.

Looking at the SoC graph, the SoC plummeted when the scheduled charge ended, despite the fact that there was only background load.

The mid-afternoon upward spike is very apparent. There was also a small downward spike mid-morning - again with very little load.

Have attached all the graphs. Would love some insights.

With thanks in anticipation.

Graphs.jpg

SOC
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matt1309 avatar image matt1309 commented ·
What's monitoring your SoC in your system? Spikes in SoC seems to correspond to spikes in current (and more likely the spike in voltage) although battery voltage stabilises yet SoC takes a hit.


It's almost as though SoC monitor is relying on voltage to measure SoC and when voltage spikes in either direction SoC updates when really it probably shouldn't.

Guessing this isn't a smart shunt and maybe BMS with some not so good SoC monitoring? Smart shunt might be the answer to your problems.


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