BMV SOC not changing when manually trying and Lithium CV .

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jdm asked Dec 11, '21

BMV SOC not changing when manually trying and Lithium CV .

Hi,

I have a system comprising of 2 x lithium super packs 25.6 x 50Ah, smart BMV , Easysolar w/CCGX , Smart shunt( measuring current from the B2B) and Orion.I've got some doubts about the SOC as it doesn't seem to change more then by 20% before it shuts down ( as the batteries have shut down a couple of times), and I can't manually set it to a value that I want say if I wanted to set it to 50%. every time I try it just reverts back to 100%.

Remote monitoring is offline at the moment which would tell me more :/

Is is correctly wired , I think it must be a settings issue . any ideas anyone I know that I need to change the discahrge floor to 15% as I have seen its at 0% at the moment , which is a mistake. alos efficieny is 95% vs 99%. also with Lithium does it make a difference to have the charged voltage set below float or absorb levels .

thanks Community !

BMV Battery Monitor SOC

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Answer 1 · 2021-12-11T17:09:20Z

seb71 answered · Dec 11, 2021 at 05:09 PM

as the batteries have shut down a couple of times

Disable "Battery starts synchronized" if it is enabled.

Also check when you start from SOC 100% if the battery actually is at 100% (measure the battery voltage).

I know that I need to change the discahrge floor to 15% as I have seen its at 0% at the moment , which is a mistake.

That setting does only matter for the "time to go/time remaining" calculation.

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Answer 2 · 2021-12-11T17:47:39Z

jdm answered · Dec 11, 2021 at 05:47 PM

Ok thanks , It is enabled , so will change

Battery voltatge definately hits the absorb , and I've beeen getting to float with the AC in.

thanks ! it says infinite currently!

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Answer 3 · 2021-12-11T21:15:14Z

kevgermany answered · Dec 11, 2021 at 09:15 PM

If you disable start at 100,% it starts at zero and gives a low battery alarm.

You may want to look at tail current, voltage settings in the BMV as well.

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Answer 4 · 2021-12-13T08:09:58Z

jdm answered · Dec 13, 2021 at 08:09 AM

Ok thanks will feedback

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