Bari Rosch
New Member
- Joined
- Sep 6, 2022
- Messages
- 14
Hey all,
Im testing my 12V, 280Ah LiFePO4 battery in combination with the 4S JK BMS (B2A8S20P-H) in my anticipated RV setup.
I found out that if you place the BMS between the battery and the BMV (see drawing attached) that the BMV does not record the proper charge currents. E.g. I charge with 25A (which is shown both on the Multiplus and the BMS), and the current on the BMV is somewhat between -8A and 18A (depending if the led screen is lit on the BMV). Also other charge current (5,10A) the readings are way off. Discharge currents it does not seem to have a problem.
If I remove the BMS the BMV does depict the correct charge currents. Also shipped the BMV to Victron and they tested the unit and said it was working properly. When connecting the BMV directly to the battery and/or hooking up the BMS after the BMV (basically swopping the position of the BMV and BMS) the BMV does report correct charge currents. I did a factory reset, current calibration all does not seem to work, so I guess the problem is with the JK BMS.
As I see the BMS as part of my battery I would like to place it directly on the main negative of the battery, and this is also how its regularly done on this forum. Anyone else experiencing this same problem? Where/how did you install the JK BMS in your systems? Is it a faulty unit, or is simply not possible to put this BMS in between the battery and BMV. What would you recommend me to do?
JK BMS details:
Vendor ID: JK_B2A8S20P
Hardware version: V11.XW
Software version: V11.12
Version: V4.8.5
Im testing my 12V, 280Ah LiFePO4 battery in combination with the 4S JK BMS (B2A8S20P-H) in my anticipated RV setup.
I found out that if you place the BMS between the battery and the BMV (see drawing attached) that the BMV does not record the proper charge currents. E.g. I charge with 25A (which is shown both on the Multiplus and the BMS), and the current on the BMV is somewhat between -8A and 18A (depending if the led screen is lit on the BMV). Also other charge current (5,10A) the readings are way off. Discharge currents it does not seem to have a problem.
If I remove the BMS the BMV does depict the correct charge currents. Also shipped the BMV to Victron and they tested the unit and said it was working properly. When connecting the BMV directly to the battery and/or hooking up the BMS after the BMV (basically swopping the position of the BMV and BMS) the BMV does report correct charge currents. I did a factory reset, current calibration all does not seem to work, so I guess the problem is with the JK BMS.
As I see the BMS as part of my battery I would like to place it directly on the main negative of the battery, and this is also how its regularly done on this forum. Anyone else experiencing this same problem? Where/how did you install the JK BMS in your systems? Is it a faulty unit, or is simply not possible to put this BMS in between the battery and BMV. What would you recommend me to do?
JK BMS details:
Vendor ID: JK_B2A8S20P
Hardware version: V11.XW
Software version: V11.12
Version: V4.8.5