It is recommended not to charge the battery pack to the full voltage of 4.2 volts per cell. I charge only to 3.8 to 4.0 volts.
My six cells in parallel charging with a 50 amp charger, is about 8 ampere per cell. In 137 charge cycles which may only take 5 to 10 minutes, the battery temperature is been in the 50 to 70 degree range. The morning temperature here in Montana even in the summer is about 50 degrees which is about 80 percent of my driving up grade. The afternoon return trip is all down hill which keeps the temperature at about 70 degrees. My battery box is insulated to over 20 R factor. A air filter exhaust fan brings in cool air through a PVC pipe into the battery box. It is also recommend by the Orion.BMS company, that the battery pack in a EV with REGEN should not be charge above 85 to 85% to leave room for the REGEN. Roland ----- Original Message ----- From: Michael Ross via EV<mailto:ev@lists.evdl.org> To: Jay Summet<mailto:j...@summet.com> ; Electric Vehicle Discussion List<mailto:ev@lists.evdl.org> Sent: Tuesday, March 24, 2015 11:50 AM Subject: Re: [EVDL] Seeking Advice: Reusing the battery modules from aNissan Leaf I don't know how you would determine ahead of time if a Leaf pack has much capacity remaining. There is a lawsuit out because Nissan did a poor job of pack design where high temperatures are seen. Some packs in hot climates have lost half their capacity in less than 2 years. They needed to have a cooling system. Something to consider when repurposing them yourself. You never want tot charge them fully, or you need to keep them cool when they are charged fully. This the damaging condition - fully charged, too hot. It has nothing to do with charge or discharge rate. You may want to only buy the packs for not much $, or get some sort of warranty - unlikely for DIY applications. Maybe if you knew the donor car was never operated in the deep south...still is is more dicey than woith other packs. I am not sure if Nissan has fixed all this on later models. I would love hear if anyone knows. They might simply have limited the final charge, or they could have added cooling. Or they could have picked a better chemistry. On Tue, Mar 24, 2015 at 1:10 PM, Jay Summet via EV <ev@lists.evdl.org<mailto:ev@lists.evdl.org>> wrote: > I am now the new owner of a totaled Nissan leaf purchased at a salvage > yard. > > I'd like to hear any first hand accounts or links to > tutorials/howto's/photos of anybody who has done this before. > > The plan is to drop and disassemble the battery pack, and re-package the > modules into sixteen set of 3 modules in parallel. (16S3P) This will > replace my 20 X 6v golf cart batteries (120 volt) lead acid battery pack in > a few months. > > I am seeing advice on: > 1) How to drop the battery pack safely. I don't have a lift, but do have > a large concrete pad. My current plan involves multiple floor jacks under > the battery pack. I know about the battery disconnect on the back > passenger floor, but was wondering if there was a suggested side of the > pack to drop first, how it disconnects, anything special to watch out for, > etc.. > > 2) Specialized tools needed. Any tricky bolts/screws I'll need to purchase > special tools for? > > 3) Advice on pack disassembly. > > 4) Does anybody sell bus-bars that would be appropriate for a 3-5 cell > parallel pack? If I make them myself, any suggestions for material type, > size/width? The plan is to connect each "pack" of 3 cells in series using > my existing lead acid connection cables. (basically, replacing 20 6 volt > batteries with 16 7-8 volt batteries...) > > As one Leaf has 48 cells, I'm using 3 cell packs for now, but am > considering leaving room to expand each pack into 4 or 5 cells > later...(extra holes on one/both ends of the bus-bars that stick out a > bit...) > > 5) I'm leaning strongly towards the MiniBMS boards for leaf cells, one per > parallel pack of 3 cells, comments one way or the other? > > 6) I'm willing to pay $200-$300 for some type of automated battery > charger/discharger with logging suitable for using on an individual 2S > Nissan leaf module. (To test and possibly bin the modules). Anybody know of > an RC type charger/tester that supports the 4.2v cells and can handle 60+Ah > discharge? (speed isn't terribly important...) > > Thanks, > Jay > > > > _______________________________________________ > UNSUBSCRIBE: > http://www.evdl.org/help/index.html#usub<http://www.evdl.org/help/index.html#usub> > http://lists.evdl.org/listinfo.cgi/ev-evdl.org<http://lists.evdl.org/listinfo.cgi/ev-evdl.org> > For EV drag racing discussion, please use NEDRA > (http://groups.yahoo.com/<http://groups.yahoo.com/> > group/NEDRA) > > -- To invent, you need a good imagination and a pile of junk. Thomas A. Edison <http://www.brainyquote.com/quotes/quotes/t/thomasaed125362.html<http://www.brainyquote.com/quotes/quotes/t/thomasaed125362.html>> A public-opinion poll is no substitute for thought. *Warren Buffet* Michael E. Ross (919) 585-6737 Land (919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones<https://www.google.com/voice/b/0?pli=1#phones>> Google Phone (919) 631-1451 Cell michael.e.r...@gmail.com<mailto:michael.e.r...@gmail.com> <michael.e.r...@gmail.com<mailto:michael.e.r...@gmail.com>> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20150324/e3dc3de6/attachment.htm<http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20150324/e3dc3de6/attachment.htm>> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub<http://www.evdl.org/help/index.html#usub> http://lists.evdl.org/listinfo.cgi/ev-evdl.org<http://lists.evdl.org/listinfo.cgi/ev-evdl.org> For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA<http://groups.yahoo.com/group/NEDRA>) -------------- next part -------------- An HTML attachment was scrubbed... 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