eMark
100 kW
garolittle said:
A variance of only 12mV ("final test") among the 28 p-groups shows the definite advantage of the more cells in a parallel group (18) the less discharge imbalance. Discharging for only 15 sec with avg p-group discharge of 3.848V resulted in an imbalance variance of ONLY 12mV.
I'd be surprised if further resting the 28S18P pack ("active and passive balancing over time") will result in a variance less than 12mV. IMO any tighter balancing is only possible manually by charging C29-C38 to 3.848V and discharging C14-C16 and C25 to 3.848V (? IF necessary ?)
When you're only discharging to 3.848V then Top Balancing may be more important or just as important as Bottom Balancing. What was the imbalance variance among the 28 p-groups at Top Charge? Was it less than 12mV? How did you TOP Balance the pack?
What were the resting voltages at Top Charge of C14-C16 and C29-C38? It's also just as important to know the variance of these p-groups at Top Charge as well as after bounce back resting voltage.
FWIW(JMO): The Molicel P26A was the best 18650 cell for the best price for your use -- :thumb:
