I thought the Leaf modules were each 4s, similar to how a 7.2v Prius module is 6s. I stand corrected. They are 2s2p.
They can be modded to 4s according to https://www.youtube.com/watch?v=kAznO_p_rEY So, yes that does mean 228 amps at an 80 kW full throttle at 3.65 volts per cell with 96 pairs in series. On Sun, Aug 2, 2020, 02:13 Cor van de Water <cor.vandewa...@gmail.com> wrote: > Nonsense, the Leaf modules are internally parallelled, so every Leaf bus > bar and interconnecting wire alread carries the full ~250 Amps peak current. > > Continuous power at highway speed is closer to about 20kW, so just over 50 > Amps. > > Internal resistance of the entire pack is about 0.1 Ohms. > This includes the 96 series cell pairs, the bus bars inside the modules > that connect the 4 cells together in 2s2p configuration, the 54 bus bars > that connect the 48 modules, the fused service disconnect and from the > contactors to the front plug, plus the 3 lengths of high voltage wire. > Cor. > > On Sat, Aug 1, 2020, 8:35 PM Haudy Kazemi via EV <firstname.lastname@example.org> > wrote: > >> I wouldn't recommend using the Nissan Leaf busbars in pack locations that >> exceed 114 amps. The bars should be fine within the series strings, which >> is what I meant in my prior reply. The ends of each of the 5 parallel sets >> should be connected some other way. >> >> I have heard of copper pipe being crushed flat, then drilled, to create >> suitable custom high amp busbars. >> >> On Sat, Aug 1, 2020, 21:35 Mr. Sharkey via EV <email@example.com> wrote: >> >> > > stack several of them for the 5p17s pack >> > >> > While it looks like you have done the calculations on voltage drop >> > and heat production, and the values are acceptable, I'd question the >> > wisdom of trying to build a 5p pack using the Leaf busbars, mostly >> > because layering up multiple short busbars to parallel the modules >> > will result in a large number of junctions between the busbars, >> > resulting in even more resistance and a lot of clutter on the terminals. >> > >> > When I built up the 2p5s pack for my Electrak this spring, I went to >> > fleabay and bought some appropriately-sized copper stock, ran it >> > through the drill press and made custom-fit busbars that could span >> > four modules (paralleling two each and making the needed series >> > connection between the paralleled modules). >> > >> > The only purpose for the stock Leaf busbars was to tie the middle >> > terminals of the paralleled modules together. In my case, that was a >> > good application, but if you are tying five center terminals >> > together, I'd even make custom bars for that too, although they won't >> > need to be very big, as in a perfect world, there isn't going to be >> > very much current flowing in that part of the circuit. >> > >> > Photos of the Et conversion here: http://www.evalbum.com/79 >> > >> > _______________________________________________ >> > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub >> > ARCHIVE: http://www.evdl.org/archive/index.html >> > INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org >> > Please discuss EV drag racing at NEDRA ( >> > http://groups.yahoo.com/group/NEDRA) >> > >> > >> -------------- next part -------------- >> An HTML attachment was scrubbed... >> URL: < >> http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20200801/b6f52045/attachment.html >> > >> _______________________________________________ >> UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub >> ARCHIVE: http://www.evdl.org/archive/index.html >> INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org >> Please discuss EV drag racing at NEDRA ( >> http://groups.yahoo.com/group/NEDRA) >> >> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20200802/c18f6758/attachment.html> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/index.html INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)