jonescg
100 MW
Hi Guys,
This post could go somewhere else, but if it's here others might benefit from it.
I have been looking into building a big (~10 kWh) pack for my e-moto and I am wondering what is the best approach. My first instinct is to go for a large capacity LiFePO4 cell like the 20 Ah A123s and make a 120 S arrangement. Failing this, go for a lower capacity cell that has been paralleled up. Inspired by KiM's HOBO cruiser, I was left wondering if it wouldn't be cheaper and a lot easier to go for 18 readily available 6S LiPo bricks, and string them in series, and paralleling three of these strings together. Balancing would be achieved by paralleling each 7-wire lead from the three sets of cells, like the following:
I would then bulk-charge at 453 V with regular balance charges every so often. No BMS. Cause it's just not practical
This unfortunately is quite space inefficient compared to going for a big LiPo stack from individual cells, like the 5000 mAh 40C cells. What do you reckon?
This post could go somewhere else, but if it's here others might benefit from it.
I have been looking into building a big (~10 kWh) pack for my e-moto and I am wondering what is the best approach. My first instinct is to go for a large capacity LiFePO4 cell like the 20 Ah A123s and make a 120 S arrangement. Failing this, go for a lower capacity cell that has been paralleled up. Inspired by KiM's HOBO cruiser, I was left wondering if it wouldn't be cheaper and a lot easier to go for 18 readily available 6S LiPo bricks, and string them in series, and paralleling three of these strings together. Balancing would be achieved by paralleling each 7-wire lead from the three sets of cells, like the following:
I would then bulk-charge at 453 V with regular balance charges every so often. No BMS. Cause it's just not practical
This unfortunately is quite space inefficient compared to going for a big LiPo stack from individual cells, like the 5000 mAh 40C cells. What do you reckon?