question

jimbo avatar image

Pylontech High Voltage Alarm

Hi I'm getting hIgh Voltage warnings on the CCGX. I understand the cells need to internally balance as it's a new system. They are, slowly, day by day.


My issue is that I have set the DVCC to 53.2V to mitigate the alarms and to allow the cells to balance but it's not stoping the alarm!.


Any ideas?


The alarms currently trigger just above 52V.



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CCGX Color ControlPylontechvoltagealarm
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2 Answers
Rob Duthie avatar image
Rob Duthie answered ·

Hi Yes they do this for new battery installs just ignore and it will come right. Have you updated all the new firmware in the inverters and controllers CCGX etc? As there are setting now to limit charge current and charge voltage etc until it settles down. Nothing to worry about, as i have done a few installs of these inverters and Pylontech batteries.

Regards

Rob D

NZ

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@Rob Duthie Yip latest version FW on all expect MPII48/5000 as it's a beta according to the VRM.

i would have thought that manually setting the DVCC would mitigate the warnings?



Note: The “Limit managed battery charge voltage” feature should be left OFF, unless you are experiencing “High Voltage” or “Internal Error” alarms. These alarms can indicate that there is an internal cell imbalance in the battery. It may be useful in this situation to enable this feature, and then adjust the voltage limit down so that the batteries are able to balance charge without reaching over voltage internally. This imbalance is at a cell level, so might not be reflected as a high overall battery voltage if measured with a Multimeter. This can then be turned off once the battery has balanced itself properly.

seb71 avatar image
seb71 answered ·

Can you see the individual cell voltages? Could be that only one cell reaches the maximum allowed voltage and the BMS triggers the high voltage alarm.

If that's the case, lower the battery charging voltage (maybe start at 51.75V and gradually raise it to 52.5V and maybe even higher) and hope that the cells will top balance eventually.

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@Seb71 The warnings are currently triggering at 52.04V. The CCGX (DVCC) overrides the Pylontech Voltage of 53.2V with 52.4V. I assumed there is an imbalance in the cells but with the DVCC set to override i should not be getting warnings.

You did not answer if you can see the cell voltages or not (I don't have a Pylontech battery and the documentation about their BMS that I could find is lacking).


You can easily have a cell over the maximum voltage when the battery voltage is only 52V.

Sorry mate. no not currently i am in the process of building a pylontech com cable.

Hi Guys


I have the wiring cable information and software to look at the Plylontech batteries parameters and cell voltages etc, if required.

Regards

Rob D

NZ

@Rob Duthie got them already bro. thank you though.