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7s config balancing question
#11
(07-16-2019, 02:58 PM)MattBarnesJCKS Wrote:
(07-16-2019, 11:56 AM)daromer Wrote: You end up with that because you dont have a BMS that do balancing as you need it to do.

Thats also the reason why you need a BMS with proper balancing functionality Smile

Correct.  That's my issue.  How to keep it bottom balanced...

The balance at the end of a discharge cycle will depend on how closely matched your cells capacity are, combined with the BMSs ability to actively balance (few do) - top balanced packs are the norm here.
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#12
Why bottom? Its not in the bortom you Will see issues. Overcharge cells are 100* more dangerous than undrcharged. I would highldy recommend top balanced battery bank or use active balancing.

Systems that do bottom are rare
Korishan likes this post
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#13
I concur with Daromer. Top Balance with cutoff at at lease 3.5V/cell as to not let a bad cell get too low
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#14
Cut off should be 3 or even 2.8... on bms Side that is. In this case the Ups decides total voltage cut out
The Ultimate DIY Solar and build place
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Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
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