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diy solar

JK inverter bms and growatt sph 4000 connection problem

fschuur

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Nov 5, 2022
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I use the new JK bms on my diy battery in combination with a Growatt sph 4000.
If I set the bms to the growatt protocol, the inverter charges the battery with intermitting amps, fro 00 to 10A within 1 or 2 seconds.
If I set the protocol to Pylontech, the charge is no problem, but the inverter does not increase the SOC. When the battery is fully charged and I set the protocol back to Growatt, the SOC is back to 100%. The next day then the charging is a problem again and I have to put it back to Pylontech to get it charged.
The firmware on the BMS was 15.17, but I downgraded to 15.11 to see if the problem was solved, but it was not. Maybe there is someone who knows a solution for this problem.
 
Don't have a Growatt but an SMA SI5048 and the JK PB BMS running 15.17. It works with Deye, Goodwe, Pylontech and SMA (called FSS connectiongbat etc) canbus. So as pylontech is based on SMA and simplified and Deye and Goodwe are based on Pylontech you have some other options to try. I have ended on SMA as it has a high resolution SOC to 0.01V instead of 0.1V (but then rounded to nearest 1V).
 
I use the new JK bms on my diy battery in combination with a Growatt sph 4000.
If I set the bms to the growatt protocol, the inverter charges the battery with intermitting amps, fro 00 to 10A within 1 or 2 seconds.
If I set the protocol to Pylontech, the charge is no problem, but the inverter does not increase the SOC. When the battery is fully charged and I set the protocol back to Growatt, the SOC is back to 100%. The next day then the charging is a problem again and I have to put it back to Pylontech to get it charged.
The firmware on the BMS was 15.17, but I downgraded to 15.11 to see if the problem was solved, but it was not. Maybe there is someone who knows a solution for this problem.
Did you ever sort this I have this same problem
Gone as far as I can now and ordered a seplos
 
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