Received a inquiry to replace a wet NiCad system consisting of 60 BB600 cell assembled into a 72 volts and 35 A/H with a newer and greener chemistries capable of carrying 10 KW/H for at least 10 minutes or more .
Do not know much about the BB600 beside they are wet NiCad and original designed for the
military , have not been able to get specification as far impedance on those cells.
Is any one familar with them and used them ?and also measured their impedance when fully charged ?.
This back up system priority list is as follow
Peak power capability 15 KWH peak surge for a maximun of 10 seconds
and capable of carrying 10KWH for at least 10 minutes
Size & weight
Recharge time 6 hours max ,
1000 Min cycles at 75% DOD .
Debating whether to go with Nickel-Zinc or LifePO4, somewhat concerned since both chemistries required sophisticated BMS, to meet the cycle life.
Would appreciate any suggestions .