Yes it’s Johnson controls. Jehu has them on his ebay page. https://kit.com/jehu/lithium-battery-sources-july-2018
Maybe send a message to Jehu he might have a spec sheet Sent from my iPad > On Apr 12, 2019, at 7:20 PM, Michael Ross via EV <[email protected]> wrote: > > I looked at the website for "Johnson Controls" solar cells, It looks > sketchy to me. > Where is the Johnson Controls part number? > Is this used or off spec hardware? > "Johnson Controls" is a good name to throw out there, but it seems like > more information would be available if it really is the Johnson Controls > we are used to seeing. Be careful. > > Hopefully some other people here will chime in. > > The working range of Li ion cells depends on the capacity of the cells - > the actual capacity, not some spec sheet capacity. *You cannot use voltage* > because the slope of voltage versus state of charge is too flat to be > useful. A very tiny change in voltage can have a huge change in state of > charge, this an odd characteristic of Li ion cells.. > > I suggest you work out a way to learn the capacity of at least one of your > cells by measuring it. And if you want the best life then you should > evaluate all the cells and react accordingly. This is what careful EV > DIY'ers have been doing for a long time. You back away from this with > increasing risk according to how much unsubstantiated information you pay > attention to. If the packs are pre-owned, or not up to spec somehow, you > really want to look closely at them. > > You say you want to operate your EV within a range of "90% of the power." > That is a worrisome statement because it is not the right words to use if > you understand what you are doing. > > This "90% range," do you meant you want to have a discharge cutoff at a 5% > state of charge, and a charging cutoff at 95% state of charge? You > definitely want to bottom balance your pack very well, and have consistent > capacities for all the cells to go this low. If you discharge a cell to 0% > and keep going, bad things can happen. If you don't understand what I am > talking about, please keep learning before proceeding. > > > >> On Thu, Apr 11, 2019 at 8:46 AM evtlfp20 via EV <[email protected]> wrote: >> >> there balanced fine, I just want to know where the working range for >> %90 of the power is. I've heard each chemistry / brand is different. I >> found a graph for leaf cells NMC like theses. >> >> >> >>> 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) >> _______________________________________________ >> 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/20190412/7fb440a9/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) > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20190412/3cc8d81f/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)
