On 03/31/2015 09:12 AM, via EV wrote:
Anyone know what the maximum discharge rate is for the Nissan Leaf
batteries?
No hard facts, but here are my estimates:
The Nissan leaf battery is made up of 48 modules, each providing 7-8.2
volts at 60Ah, for a total of 390-400 volt max @ 60Ah or ~24 kWh.
The leaf motor is rated at 80 kW, and the battery pack is supposed to be
able to provide up to 90 kW (motor + all accessories), which at maximum
voltage would be 228 amps. This is around 3.8 times C (60Ah) which seems
to be easily in the realm of possibility, and matches up with the fact
that the fuse in the leaf battery pack is a 250 amp fuse.
Individual modules MAY be able to provide 10C (600amps!) for a short
period of time, but may also burst into flame or just die quickly if
asked to do so....I wouldn't recommend it!
I expect that they can provide a solid 3C rate for a relatively decent
amount of time (30 seconds anyways) without any serious ill effects in
the long term, which is very much in line with other lithium batteries.
For my application (S-10 pickup at 120 volts) I'll rarely need to go
over a 300 amp draw (typically 50-100 amps continuous) and am planning
on arranging them in sixteen series packs of 3 parallel modules, giving
a 180-190 Ah battery at close to 120 volts. So my max discharge will
probably be closer to the 1.7-2 C rate which feels relatively
conservative to me.
Jay
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