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
The story up to now has been that LFP cells have that voltage range.
The voltage range for different types of battery is not the same. It may be that the voltage range for different types of LFP cells is different too. Don't know.
Battle Born says their 100AH battery is full at 13.6 and empty at 10v. A 120AH BB batt made of the same type of cell would also be 13.6-10, so if it were down 100 (of the 120) it would be at approx 12v.
If they called their 120AH batt a 100AH batt, it would still show 12v when down 100AH. Since they use 10v for zero, that means it is not de-rated.
The video guy has it at 102AH, claiming the little cell is 3.4AH and there are 30 of those in the pack, with 4 packs in the battery.
In another video he makes a battery with 4 blue things each said to be 384 Wh and 120AH (3.2 x 120 = 324 so he is still using 3.2v for that)
I don't know the terminology etc, but the one blue thing at 120AH could have all sorts of things inside it adding up to 120AH, where the 100AH BB has 30 things in the pack each at 3.4 AH. Whatever.
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The BB FAQ says:
"Conversely, LiFePO4 (Lithium Iron Phosphate) batteries can be continually discharged to 100% and there is no long-term effect. You can expect to easily get 3000 – 5000 cycles at this depth of discharge."
Note- seems to say "all LFPs", not just BBs.
The voltage range for different types of battery is not the same. It may be that the voltage range for different types of LFP cells is different too. Don't know.
Battle Born says their 100AH battery is full at 13.6 and empty at 10v. A 120AH BB batt made of the same type of cell would also be 13.6-10, so if it were down 100 (of the 120) it would be at approx 12v.
If they called their 120AH batt a 100AH batt, it would still show 12v when down 100AH. Since they use 10v for zero, that means it is not de-rated.
The video guy has it at 102AH, claiming the little cell is 3.4AH and there are 30 of those in the pack, with 4 packs in the battery.
In another video he makes a battery with 4 blue things each said to be 384 Wh and 120AH (3.2 x 120 = 324 so he is still using 3.2v for that)
I don't know the terminology etc, but the one blue thing at 120AH could have all sorts of things inside it adding up to 120AH, where the 100AH BB has 30 things in the pack each at 3.4 AH. Whatever.
---------
The BB FAQ says:
"Conversely, LiFePO4 (Lithium Iron Phosphate) batteries can be continually discharged to 100% and there is no long-term effect. You can expect to easily get 3000 – 5000 cycles at this depth of discharge."
Note- seems to say "all LFPs", not just BBs.
