liveforphysics wrote:Great work Peter!
Inductively, there is going to be some jumping and bouncing going on, so if it shuts down at ~220v, I wouldn't exceed 200v as peak battery voltage, and even then, you're going to want to add quite a bit of well-placed extra cap to try to keep it from jumping past 220v.
If you go with 45-90c Nano-techs, I can confirm the 4Ah cells can handle 300amps continuously from start to finish, and they stay cool(luke warm) for the top ~65% of discharge, but the temp does start to rapidly climb as SOC drops and Ri increase during the bottom of the SOC area, so if at all possible, I would stick with only using the top half of the SOC if you're planning to be pushing them to the limits.
Can they handle the regen current of around 50amps(or possibly more with modifications) though? I thought charging was the territory to be more concerned about for these cells. Granted regen should be avoided and likely best to not fully charge the cells before taking off too but wouldn't the 4Ah cells be limited to 40amps of regen by spec? Can they handle more in say a 15 second duration easily and still last a decent cycle life in LiPo terms?
Regen IMHO isn't all that important though as the focus is on power but I wouldn't want to kill or dramatically shorten the life of the cells during a standard stop or hill descent using regen. What are your thoughts?