jaycocreek wrote:
but BattleBorn deliberately derates their 100 amp-hour to 100 from a "real" 120 amp-hour.
Please explain this as Will Prowse tore one down and did the math off the actual cells which in turn produced 1305.6 watt hours compared to there advertised 1280...Not that much difference really certainly not 20 amp hours IMHO..
He said each of the 120 cells has 3.4 AH and used 3.2v to get 10.88Wh.
He then did 120 x 10.88 = 1305.6Wh
DOT shipping "nominal" voltage is 12.8 so 100AH x 12.8 = 1280Wh. He then said this meant the BB had "extra capacity"! (insert own comment on why he acted so happy to "learn" that) He did not give the "real AH".
But if each cell is 3.4AH (don't know where that came from), then each of the four packs of 30 cells is 30 x 3.4 = 102AH and in parallel, that is 102AH for the battery
Note that 12.8 x 102 = 1305.6. (of course)
IMO you should use the voltage for the the capacity when full , said to be 13.6 for LFP to get your Wh, so if it is really 102AH then Wh would be 1387.2.
But voltage drops to 13.3 when a load is applied, so since say 99% SOC is then 3.3, then 100.98 x 13.3 = 1343 Wh
None of which says how low you can go while deciding on the "usable AH".
