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 <[email protected]> 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 protected]> 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/20200802/4ab1a172/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)
