JK 150A BMS SOC jump when charging( but not 200A )

[Noordsolar]

HAve 3 batteries in parallel and usually discharge from 100% SOC ( according to well calibrated Victron BMV ) to around 70% overnight then recharge . One JK battery has the 200A JK and that is always within 1 - 2% of the Victron reading whilst the other two - both 150A JK's show correct values when discharging , however very soon as solar charging takes place they jump to 96 %. The 200 A does not do this - wierd - any ideas ?

 

[SveinHa]

Have a look in the log (upper right corner of the app) and see if that can shed a light on anything.

 

[upnorthandpersonal]

Check the firmware/hardware version on all of them. I think there might have been some software (and hardware?) changes to get more accurate readings. @Nami ?

 

[Noordsolar]

Have a look in the log (upper right corner of the app) and see if that can shed a light on anything.

Nothing logged

 

[Noordsolar]

Check the firmware/hardware version on all of them. I think there might have been some software (and hardware?) changes to get more accurate readings. @Nami ?

Check against what ? Is there a firmware changelog register available somewhere ?

 

[upnorthandpersonal]

Check against what ? Is there a firmware changelog register available somewhere ?

You can check the 'About' on each BMS. At least you can compare against each other.

 

[Nami]

Please provide BMS operation log,

 

[Noordsolar]

Please provide BMS operation log,

LOG for the 200AH

 

[Noordsolar]

Log for the 150AH , note errors are all from over 2 weeks ago and was due to setting changes ,

 

[Noordsolar]

Version 200A

 

[Noordsolar]

Version 150A

 

[uksa007]

however very soon as solar charging takes place they jump to 96 %. The 200 A does not do this - wierd - any ideas ?

Are all the BMS setting the same most importantly the OVP, is it 3.6v?
I find with my 150A if the OVP is set below 3.6v I get SOC jumps when charging with higher currents above 50A.
This is due to the voltage rise in the pack, but the cells have not absorbed at that voltage so if the OVP is lower the BMS thinks the cells are almost charged. They are not it's just the voltage rise confusing the BMS.

Upshot, set the OVP to the default of 3.6v and no more SOC jumps,