4 ms·
Why not use LiFePO4? Those should be much more stable.
by treprinum 3y ago
Why not use LiFePO4? Those should be much more stable.
- stonogo 3y agoPower density is much lower. On a vehicle you have to pedal one the power is out, weight savings matters.
- happosai 3y agoHaving to pedal without power from battery is extremely rare on e-bikes. They have range of 100km+ and few people bike that much between charges. LFP:s are less popular for DYI because you need a much smarter BMS to deal with the flat voltage curve when charging. A cheap, easily available open source LFP BMS should solve that.
- mbgerring 3y agoYou don’t need a “much smarter” BMS for LFP, Daly BMS for LiPo and LFP are roughly the same price.
- AYBABTME 3y agoFor SoC many ebike BMS just use voltage curve to give a rough approximation. But with LFP you need a shunt and a coulomb counter, because the voltage curve is essentially flat until the very last Wh.
- treprinum 3y agoI ended up pedaling without power on a 3 hour trip in the mountains on a 750Wh battery/85Nm motor. Can be easily done ;-)