I am not sure what you want the depth of discharge graph for. The cells won't be identical and the graph would actually be a band, or range about an average DOD.
It might be advantageous to measure the capacity of each cell and return any that seem to far out from the others. If you are not interested in that, then you can formulate an useful DOD limit for the pack based on the capacities. I personally thin balancing the pack at the level of discharge is best = bottom balancing. Then you can implement a shutoff voltage or DOD% with some factor of safety, and select a float charge that is not too high. This is fairly laborious, but it protects tour investment. A car company like Tesla will control manufacturing processes and have tight control over the cells construction and capacity, So they can build a pack without laborious balancing and still get good performance. It is very hard to get useful information about batteries bought retail, wholesale or used. On Wed, Apr 10, 2019 at 2:26 PM evtlfp20 via EV <[email protected]> wrote: > the company is not giving me very much information. they stat a voltage > range but I'm looking for a DOD graph, they stat NMC chemisrty not not > much more . > > https://www.techdirectclub.com/johnson-controls-24-cells-solar-battery-90-vdc-total-2-5-kwh/ > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Please discuss EV drag racing at NEDRA ( > http://groups.yahoo.com/group/NEDRA) > > -- Michael E. Ross (919) 585-6737 Land (919) 901-2805 Cell and Text (919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Tablet, Google Phone and Text -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20190410/663bdb6b/attachment.html> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
