Battery SOC inconsistancy

Batteries

Last Post by Joel Brodeur 2 months ago

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Dademt

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November 15, 2024 9:34 pm

(@dademt)

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Have three indoor wall mount units. 2 I have been running for about 6 or so months and the other brand new. Just switched over to eg4 18k inverters not that it should matter but noticing that my battery readout on SOC is way off compared to voltage. So the voltage all appears basically equal and the batteries regularly go down into the 20's or below before charging all the way up so I don't think it is a equalization issue but can't figure out why the discrepencies on the SOC. Any insight anyone?

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Joel Brodeur

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November 27, 2024 4:27 pm

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Dademt

Posted by: @dademt

↑

Have three indoor wall mount units. 2 I have been running for about 6 or so months and the other brand new. Just switched over to eg4 18k inverters not that it should matter but noticing that my battery readout on SOC is way off compared to voltage. So the voltage all appears basically equal and the batteries regularly go down into the 20's or below before charging all the way up so I don't think it is a equalization issue but can't figure out why the discrepencies on the SOC. Any insight anyone?

-- attachment is not available --

It has been a while. Has the SOC discrepancy gotten any better after some more charge/discharge cycles?

Sometimes the easiest solution is the best solution.
Sometimes not.

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Joel Brodeur

November 15, 2024 11:17 pm

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My 2-battery drift that way as well on SOC but definitely not that dramatically.

I have seen posts on other forums about "resetting" the BMS's through some magic Vulcan nerve pinch, but I have never seen an EG4 tech recommend or instruct a consumer to do it.

Please keep us posted and sorry I wasn't any help.

Thanks,

Sometimes the easiest solution is the best solution.
Sometimes not.

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Dademt

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November 15, 2024 11:39 pm

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Joel Brodeur

@joel-brodeur Glad I wasn't taking a drink reading the magic vulcan nerve pinch. That was funny. Appreciate the insight however.

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wiredup

November 26, 2024 2:26 am

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I have the all weather Power-pro wall mount with 18k and I am seeing something similar. Charges up to 99% and within a day or so it's down to 80% with absolutely no load (not connected yet). However the voltage does not change at all. Still working with tech on this.

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Dademt

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January 7, 2025 7:46 pm

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wiredup

@wiredup Did you hear anything back on this yet? Just curious.

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Jared

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November 26, 2024 7:14 pm

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Could you provide the data history to help clarify this issue? Depending on the time frame, the battery drain might be due to the inverter's normal or idle wattage consumption. With typical consumption around 70W and idle usage about 15W, this could amount to a combined draw of approximately 2,040Wh over a 24-hour period.