June 27, 20242 yr Need your input as to what might be happening, I have a 8kw sunsynk inverter with 2 x BSL batteries (plus panels), in the photos it seems that when my battery reaches about 40% it suddenly drops and then charges again, is it potentially a setting or maybe a bigger problem?
June 27, 20242 yr Looks like a BMS issue, try contacting BSL and explaining the issue to them. They may do a software upgrade and will advise further.
June 27, 20242 yr 5 hours ago, Parrot said: is it potentially a setting or maybe a bigger problem? You can also check your DC battery cable connections right up to the inverter terminals, if they don't make good contact, you could have fluctuations.
June 28, 20242 yr 21 hours ago, Gerrie said: You can also check your DC battery cable connections right up to the inverter terminals, if they don't make good contact, you could have fluctuations. Normally a very valid point. In this case with the same constant load and gradual discharge up to 40% I would do as @abd7 suggested.
June 28, 20242 yr The question is what is the battery volts when it reports 100% Seen this more than ones were BMS goes out of calibration so when the BMS reports 40% the cells are really completely drained and so in reality they are 0% . BMS upgrade normally help as they have fix bugs on newer updates . Most of the time we change inverter charging from percentage to volts and charge the battery to specified volts for the battery installed after fully charged change setting back to percentage. Take note if you do change setting to charge by volts be 100% that the volts you set into the inverter are the volts specific for your lithium Edited June 28, 20242 yr by GMAC
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