Hello Community Experts, I hope someone can help me with a problem I’m facing. My setup is as follows: MultiplusII 48/10000/140 running the latest firmware 556 16S LiFePO4 battery, 304Ah, with a Pace 200A BMS Cerbo GX SmartShunt 300A The system is configured for ESS with self-consumptio…

I show you the moment (SOC 50%) when the bms shows the “total voltage fault” and falls into the idle state, at the same time the Smartshunt shows 55,96v. So the MP says: absorption time. But at the same time the Smartshunt starts to show different voltages, see the video I uploaded. Among the differ…

Have you seen this [image] "Low Battery (Victron) and"Total Voltage Fault" (BMS) DIY My installation: Multiplus II 48/10000/140. Battery Tewaycell Lifepo4 16S (Pace BMS) 15kwh, 308 Ah (in Cerbo displayed as 290 Ah), Cerbo GX and system runs with ESS. For a …

Hi chrigu, Thanks for your reply, hope you can help me like the last time!! I checked all the connections between battery/Shunt/circuit breaker/Multiplus. All bolts are tightened with the correct torque. I can give you a link to my OneDrive to a file with all sceenshots from the BMS and VRM porta…

Hi Mac, Thanks for your suggestion.I know that thread very wel. It was me who posted it. The solution at that time was the shut down for some time. After restarting the MP and battery all worked fine (6 months )until now. And now is that solution not working :-((.

Hi chrigu, Yes the voltage comes directly from the BMS. Smartshunt is new, the cables are well connected. The screenshot from the VRM is when the battery in the idle state. In that situation the smartshunt shows voltages from 41 volt to 58 or even 60 volt. Why? I don’t know. With the battery comple…

[image] tissage: In that situation the smartshunt shows voltages from 41 volt to 58 or even 60 volt. Why? Because the BMS has disconnected the battery. Its the same situation as you describe just after. The MP is trying to charge the battery, but its not there, so it bounces off of the absorp…

But why is the battery in the first place charged to 50% and then start the absorption. I configured that the absorption stage begins at 56v ( charged100%) and the float to 54v.

I dont know where those 50% come from, but 56V is 3.5V per cell, so i guess one of them is too high on voltage and the balancing cant correct it fast enough, so the BMS shuts the pack down. Do those 56V get reached while its charging? How do the cell voltages look like? Maybe try charging to 54.4V o…

When the battery is charging with 3 kw the difference between the cells are minimal. The active balancing is working. [Screenshot_20250815-064857]

This screenshot [Screenshot_20250815-065403] is on SOC 49%.

Lifepo4 battery charge problem

DIY

mac 14 August 2025 17:02 3

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Lifepo4 battery charge problem

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