LiFePO4, BMS, BatteryProtect, Easy Solar

DIY
, , , ,
1

Hi everyone,
I have a Victron LiFePO4 25.6V/100Ah Smart battery (SN: HQ2052*****, PN: BAT524110610, manufactured 2020) connected to an Easy Solar with a VE.Bus BMS, installed on a floating platform in Berlin.

The problem:
The VE.Bus BMS started showing a red LED — Cell >4V or Temperature alarm. The Easy Solar shut down completely via VE.Bus and the entire system stopped working.
What I have checked:
• Total battery voltage at terminals: 27.2V — normal
• Replaced the VE.Bus BMS with a brand new unit — red LED still present on new BMS
• Battery Bluetooth not visible in VictronConnect app
• Color Control GX shows battery at 27V, 0.2A from solar only — Easy Solar shows “Off”
• Opened the battery and measured all 8 cells individually directly at the copper busbars
Individual cell voltages measured:
Cell 1: 3.43V
Cell 2: 3.42V
Cell 3: 3.42V
Cell 4: 3.42V
Cell 5: 3.42V
Cell 6: 3.38V
Cell 7: 3.35V
Cell 8: 3.34V
All cells are perfectly normal. No cell above 4V anywhere. Total adds up to 27.18V which matches terminal measurement.
Additional finding — BatteryProtect BP 12/24-100:
The BatteryProtect unit connected downstream is showing no display at all — no digits, no LEDs. Voltage measured at both IN+ and OUT+ terminals is 26.8V, so power is reaching the unit correctly. The BatteryProtect appears to have also failed or lost its internal power supply despite correct input voltage.
Is it possible the false overvoltage signal from the internal battery BMS damaged the BatteryProtect unit as well?

My conclusion:
The internal BMS board inside the battery appears to be sending a false overvoltage alarm signal to the VE.Bus BMS. The battery Bluetooth is also not broadcasting, which suggests the internal electronics have failed while the cells themselves remain healthy.
Questions:

  1. Is this a known issue with this battery generation (hw rev 01, manufactured 2020)?
  2. Can the internal BMS board be replaced or reflashed?
  3. Is this covered under Victron’s 5-year warranty?
  4. Could the faulty internal BMS signal have damaged the BatteryProtect?
    Any help appreciated — this is an urgent situation as the battery powers a live floating platform.
    Thank you
2

Unknown. Most battery problems are due to improper system design / fabrication.

With care the Lithium Battery Smart circuit board can be replaced.

Text from the Victron warranty Doc.

Lithium batteries: 3 years from date of purchase by the original end-user, with a maximum of 42 months from the Victron Energy invoice date. In addition to this, proof of correct battery usage is required when making a battery warranty claim.

Unlikely. Battery protects will be damaged if they are used between a battery and inverter / charger though.

If you are capable your best course of action would be to test the BMS and BTV cables as per manual. A damaged BTV cable, plug / socket is easy to test.

3

Thank you very helpfull!

So very likely it is a circuit board and it looks like for my 25.6V/100Ah Smart (Part Number: BAT524110610)

I need circuit board part number SBP220110020

any ideas of the cost and how to get it in Germany/Berlin?

4

Did you try to power cycle the BMS board?

You should ask an official seller/distributor.
https://www.victronenergy.com/where-to-buy

5

Here is actual pictures and manual battery and cells check

IMG_5953
IMG_59531206×2622 335 KB

IMG_5944
IMG_59441920×2560 860 KB

IMG_5946
IMG_59461920×2560 882 KB

IMG_5947
IMG_59471920×2560 902 KB

IMG_5950
IMG_59501920×2560 905 KB

6

thank you Matthias, so its just a matter to disconnect the black cable for + terminal? For a reset of the circuit board?

IMG_5955
IMG_59551206×2622 248 KB

7

That’s what the manual says.

8

Thanks guys. Gunna sleep on this.

9

IMG_5957
IMG_59571206×2622 171 KB

it seems this trick helped reincarnate the battery!

Blue light in On and Red light is gone on BMS

10

Sometimes (very often) it helps to read the manual. :slight_smile:

11

IMG_5958
IMG_59581206×2622 220 KB

image
image1206×2622 249 KB

Last night and this morning