Daly BMS gone crazy..Update Opinions
I was charging my 120ah lifepo4 battery yesterday and came in for lunch and saw it shut down..I figured it hit the 3.65 volt cell limit and shut down,I went out to check it and saw this on the Blueto...
Forum Discussion
What can get confusing with lfp is dropin or diy cells/ battery. Then within that arena are the bms's that can get set by and not altered in dropins or bms's that can get set by the diy.
Then there is the 'full' capacity amount. Mine is set to 14.1v. Capacity Algorithm:The EMS CPU keeps track of the capacity of the battery pack by tracking current in and out of the battery (coulomb counting). There are however several corrections built in to the software to ensure that the capacity stays accurate over time.
The capacity will reset to 100% if the following conditions are met:
- Total pack voltage measures 3.52V x N (N being the number of cells) when being charged by a battery charger.
I could set the voltage higher (14.2-14.6v) but for me 14.1v or 14.2v works perfectly for my needs and keeps the cells fairly equal to each other.
Dropins seem to require a higher voltage of 14.4v +/- the get the capacity reset and balancing the cells.
The difference from full charge from 14-14.6v is very minimal but at the high voltage if you have any runner cells they get pushed in to the upper knee with little return and possibly shortening the life. Which then leads to the next dilemma or debate are your batteries for full convenience of day to day use or you want the "longgggg" life with many cycles of lfp.
Decisions, Decisions
Then there is the 'full' capacity amount. Mine is set to 14.1v. Capacity Algorithm:The EMS CPU keeps track of the capacity of the battery pack by tracking current in and out of the battery (coulomb counting). There are however several corrections built in to the software to ensure that the capacity stays accurate over time.
The capacity will reset to 100% if the following conditions are met:
- Total pack voltage measures 3.52V x N (N being the number of cells) when being charged by a battery charger.
I could set the voltage higher (14.2-14.6v) but for me 14.1v or 14.2v works perfectly for my needs and keeps the cells fairly equal to each other.
Dropins seem to require a higher voltage of 14.4v +/- the get the capacity reset and balancing the cells.
The difference from full charge from 14-14.6v is very minimal but at the high voltage if you have any runner cells they get pushed in to the upper knee with little return and possibly shortening the life. Which then leads to the next dilemma or debate are your batteries for full convenience of day to day use or you want the "longgggg" life with many cycles of lfp.
Decisions, Decisions
