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anacrhy2007 asked

CERBO GX BMS-CAN PYLONTECH FORCE L1 = DAMAGED BMS

Hi, I have a very strange problem.
Cerbo GX BMS-CAN connected to Pylontech US3000C CAN port works 100% with a Victron Type A cable.

Connecting the same system to the Pylontech Force L1 CAN port blows the BMS within 10 seconds. This has heppened on 2x Pylontech Force L1 BMS. It litterally burns the componenets on the BMS PCB right next to the RS232 and CAN ports. Has anyone experienced this type of issue?

cerbo gxBMSpylontech lv hub
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Alexandra avatar image Alexandra ♦ commented ·

Are you using the can terminator? And is the battery earthed?

Are the pins 1-3 empty or not connected?

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anacrhy2007 avatar image anacrhy2007 Alexandra ♦ commented ·

Can terminator is installed (Cerbo LEFT BMS-CAN port)
Battery is earthed
Which pin 3 are you refering to? Cerbo side or BMS side? BMS side all pins are empty except for 4, 5 & 6
Victron Side = Pin 3 GND, PIN 7 CAN-H, PIN 8 CAN-L (all other pins empty)
Pylontech Force L1 Side = PIN 4 CAN-H, PIN 5 CAN-L, PIN 6 GND (all other pins empty)

Exactly the same setup works 100% with a PYLONTECH US3000C.

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Since communitcation is working on CAN-H and CAN-L this only leaves pin 3 as the culprit.

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anacrhy2007 answered ·

Cerbo GX - BMS-CAN Pin 3 = GND (Measured and confirmed)
Force L1 CAN Pin 6 = GND (traced back to pin 2 of CAN bus tranceiver on BMS PCB

I'm at a loss I cannot find a reason for this, unless there is an issue with the Force L1 BMS. This is now the 3rd BMS. No way I'm plugging that comms cable back in without finding the issue first.

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Delta Victor avatar image Delta Victor commented ·
Did you eventually find the problem?

As far as i know, can bus type A cable should be used.


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Alexandra avatar image Alexandra ♦ Delta Victor commented ·

Pylontec require that the ground not be connected. It is in their manual. Hence the statement pins 1-3 must be empty - gnd is pin 3.

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anacrhy2007 avatar image anacrhy2007 Alexandra ♦ commented ·

I think you may be refering to the RS232 cable for use with the Pylontech "Battery View" software. That requires only the TX and RX data pins and no ground.

Pin 3 on Pylontech CAN Bus is not GND.
Pin 6 on the Pylontech is GND. Pin 3 on the Cerbo is GND.

This is from the actual Pylontech Force L1 manual 6=GND, 5=CAN-L, 4=CAN-H pins "all other shall be null" It is std Victron Type A cable.

https://en.pylontech.com.cn/view_pdf/web/viewer.html?file=/A_UpLoad/upload_file/20201223015618924.pdf&fname=Force-L1+Operation+Manual+(V2.3)-20P1FL0302+-AU.pdf.pdf


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anacrhy2007 avatar image anacrhy2007 Delta Victor commented ·
Sadly I did not, even tried Pylontech support without any joy. Eventually added a Smart Shunt to the battery bank. I actually replaced the Pylontech last week. So yes, I suppose that did fix the problem :)
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Delta Victor avatar image Delta Victor anacrhy2007 commented ·
Sad to hear it didnt work out.


did you also contacted Victron about this?
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