SandyMcC
New Member
- Joined
- Nov 2, 2021
- Messages
- 42
I'm looking for advice
I have a problem with one cell (#6) in a 16 cell LIFEPO4 pack. It is a brand new pack so I hope Liitokala will replace it - but so far no response..
On arrival this cell had a slightly damaged corner, which I reported to LiitoKala. After testing, all the cells were exactly the same at 3.30v so we agreed to ignore the damage and hope there would be no adverse effects.
Suppose I remove cell #6 and replace it with cell #16.
I 'tell' the BMS (DALY) that there are now 15 cells and the pack cut-off voltages have changed accordingly.
I hope that I can persuade my Growatt SPF5000ES to run at these lower voltages.
Can this work OK?
Is there a better alternative?
Background information
As things stand now, I get less than 75% capacity, probably because of the voltage sag on the original cell #6; the BMS cuts out.
Average voltage per cell 3.068v
Delta V is 0.532v
Cell #6 is 2.629v
It may take 2 to 3 months to get a replacement.
This way I can get 15/16 = 93% capacity while I wait for a replacement cell to come from China.
I have watched lots of your videos on YouTube and get great joy from the help and inspiration they give me - thank you so much
It must take a big chunk of your time!
At 25% SOC... Big voltage difference 0.532v Highest-Lowest Delta V
At 78% SOC... Low Delta 0.029v
I have a problem with one cell (#6) in a 16 cell LIFEPO4 pack. It is a brand new pack so I hope Liitokala will replace it - but so far no response..
On arrival this cell had a slightly damaged corner, which I reported to LiitoKala. After testing, all the cells were exactly the same at 3.30v so we agreed to ignore the damage and hope there would be no adverse effects.
Suppose I remove cell #6 and replace it with cell #16.
I 'tell' the BMS (DALY) that there are now 15 cells and the pack cut-off voltages have changed accordingly.
I hope that I can persuade my Growatt SPF5000ES to run at these lower voltages.
Can this work OK?
Is there a better alternative?
Background information
As things stand now, I get less than 75% capacity, probably because of the voltage sag on the original cell #6; the BMS cuts out.
Average voltage per cell 3.068v
Delta V is 0.532v
Cell #6 is 2.629v
It may take 2 to 3 months to get a replacement.
This way I can get 15/16 = 93% capacity while I wait for a replacement cell to come from China.
I have watched lots of your videos on YouTube and get great joy from the help and inspiration they give me - thank you so much
It must take a big chunk of your time!
At 25% SOC... Big voltage difference 0.532v Highest-Lowest Delta V
At 78% SOC... Low Delta 0.029v