jasonhc73
Cat herder, and dog toy tosser.
When you parallel a cell(or battery) they balance all on their own, simply by the nature of being connected.
no, lifepo4 cells will not shelf balance voltage difference is to smallWhen you parallel a cell(or battery) they balance all on their own, simply by the nature of being connected.
When you parallel a cell(or battery) they balance all on their own, simply by the nature of being connected.
My (very limited) understanding is that what may be true in theory is not necessarily true in a practically relevant sense.When you parallel a cell(or battery) they balance all on their own, simply by the nature of being connected.
This is very interesting to me. So, if you have cells in parallel inside of a pack and you do an initial top balance of all the cells, would it be possible for the cells in parallel to drift apart from each other after a certain number of charge cycles on the battery pack? Or do they stay pretty balanced if you initially balance them? The reason I'm asking is because if you do lets say a 2p4s battery pack, you're only monitoring the series cells as a single cell with the BMS and you wouldn't be able to see if the cells were unbalanced. I have 8 cells coming for a 12v system and I'm still trying to decide between two battery banks and paralleling 2 cells together in a single battery bank.My (very limited) understanding is that what may be true in theory is not necessarily true in a practically relevant sense.
Putting cells in parallel moves them in the direction of balancing. But because of the flatness of the voltage curve for LFP, and very small differences in voltage equating to large differences in SOC, simply paralleling cells is not a reasonable way to balance in any realistic timeframe.
If I understand correctly:
[Equalization current] = [Difference in Voltage] ÷ [Total Resistance]
What this means (1) current in the middle of the curve will be very low even with a substantial difference in SOC (2) it will get lower and lower as SOC equalizes.
This is very interesting to me. So, if you have cells in parallel inside of a pack and you do an initial top balance of all the cells, would it be possible for the cells in parallel to drift apart from each other after a certain number of charge cycles on the battery pack? Or do they stay pretty balanced if you initially balance them? The reason I'm asking is because if you do lets say a 2p4s battery pack, you're only monitoring the series cells as a single cell with the BMS and you wouldn't be able to see if the cells were unbalanced. I have 8 cells coming for a 12v system and I'm still trying to decide between two battery banks and paralleling 2 cells together in a single battery bank.
I’m interested, what was you’re lead acid capacity and your new lifepo4 capacity?This conservative setup is giving me +-30-40% more run time than my previous lead-acid batteries depending on loads...
Lead acid capacity was 250ah.I’m interested, what was you’re lead acid capacity and your new lifepo4 capacity?
What is the capacity in each of your two new lithium battery 12v battery’s ?Lead acid capacity was 250ah.
The old Lead acid capacity was 250ah, the new LiFePO4 batteries are 135ah each, so in parallel 270ah.What is the capacity in each of your two new lithium battery 12v battery’s ?