Exactly, Where can you find a sophisticated EV for $5k and with a $3k as-new battery pack get a low mileage car with excellent range for much less than you can convert a car, let alone buy a recent model car to convert? And as for using Leaf packs in my truck - again, available capacity and ease of integration (BMS is included) for the lowest cost made the Leaf pack a winner - I know there are better batteries. Just like I did this same truck with lead-acid 11 years ago and now use Leaf cells, I will probably use something else next time. For now, Leaf cells are good enough, the two packs that I have will give me close to 100 miles of range. It is not often that I want to go that far and when I do, I like to be more comfortable than in a 22 year old truck and usually I go a lot further than 100 miles on those occasions.
Cor van de Water Chief Scientist Proxim Wireless office +1 408 383 7626 Skype: cor_van_de_water XoIP +31 87 784 1130 private: cvandewater.info http://www.proxim.com This email message (including any attachments) contains confidential and proprietary information of Proxim Wireless Corporation. If you received this message in error, please delete it and notify the sender. Any unauthorized use, disclosure, distribution, or copying of any part of this message is prohibited. -----Original Message----- From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of lektwik via EV Sent: Tuesday, December 27, 2016 5:26 PM To: tomw; Electric Vehicle Discussion List Subject: Re: [EVDL] Leaf battery pack connector I am thinking the wide availability of the Leaf packs at a reasonable cost from local wrecking yards is a major driver. Plus. Wrecking yards usually will deliver it for free :-) On Friday, December 23, 2016, tomw via EV <ev@lists.evdl.org> wrote: > May I ask why the two of you (John, Cor) decided to use Leaf packs rather > than Volt packs? The spinel chemistry used in Leaf batteries is known to > be > inferior to the NMC chemistry which I think is used in Volt packs, and the > Volt packs have liquid temperature control to further improve longevity. On > the other hand, the Leaf modules seem to be much easier to work with if you > want to make a custom pack, say by combining the basic 2s2p modules in > parallel to make higher Ah modules, or to fit an existing battery box in a > conversion. > > Then there are also Tesla S modules available which seem to be the best > chemistry for longevity and the highest energy density. Some are concerned > with the safety of these higher energy density cells, but the Tesla packs > seem very well designed for safety with each cell fused on both anode and > cathode, and my understanding is you have access to the bms wires from each > module so can straight-forwardly connect a bms to them. > > Just wondering what drove your decision. I've toyed with the idea of using > one of the above in my conversion for a couple years now, but my LiFePO4 > pack, though 7 years old, is still doing fine so I'm reticent to spend more > money on batteries, and I'd kind of like to see how long it lasts before > significant degradation. I lean more toward Tesla modules since I could > double my pack size and have a bit LESS weight, and I think with proper > care > in the implementation, packaging, and operation (bms) they would be safe. > > I also prefer liquid cooling since I think the end of life of my cells will > be caused by creeping up internal resistance, not capacity loss. We get > fairly high temperatures here in July and August (~100F, sometimes above) > so > the higher internal resistance will result in more pack heating and pack > temperatures exceeding the ~40C (104F) limit above which it seems that > greater deterioration occurs. I've exceeded that a few times, and expect it > will get more frequent as ir creeps up. > > -- > View this message in context: http://electric-vehicle- > discussion-list.413529.n4.nabble.com/Leaf-battery-pack- > connector-tp4684927p4685015.html > Sent from the Electric Vehicle Discussion List mailing list archive at > Nabble.com. > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Read EVAngel's EV News at http://evdl.org/evln/ > 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/20161227/f86d f11f/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
