I use about 0.8Ah / mile with nominal 48V pack. Roughly 40W/h/mile averaging 24mph for the 25 mile commute (country 2 lane 80% of distance then urban for the remainder). I charge up at home and at work. I guess I am buying about a kW each time for $0.12. The charger is 60VDC, and shuts off at 56VDC. 56VDC/16 cells = 3.5V per cell. There is a BMS of uncertain function that is supposed to balance the cells. I only have about 1000 miles on it.
I just did a teardown and repackage of the cell pack, and it was made of 18650 cells - 96 of them in banks of 6 in parallel, 20Ah in a bank. Interestingly, I can buy this pack with BMS, charger, air shipping for $445. $22.25 / 48V Amp hour. $445 / 96 = $.63 / cell (ignoring the extras). Hard to ignore shipping from China though - it is usually $200 or so. I guess the pack is sort of only $250. On Thu, Nov 7, 2013 at 7:53 AM, Mark Hanson <[email protected]>wrote: > Hi, > > > > I use about 2ah per mils or 330W/hr per mile and work is 30 miles each way > & charge at work (about 60ah down on the 130ah batts). Sometimes I drop to > 90-100ah down (on LinkPro Xantrex meter) about once a week when I have > extra errands on the way home. The pack gets charged close to 100% on each > cycle twice daily. Sometimes I run out at lunch for parts, (that's where > the 70 miles daily comes from.) I have 20k miles right now onthe pack and > the battery scanner shows no low cells. I made my own balancers on > www.evdl.org/lib/mh linked to the charger, when any one cell hits 3.6V > the charger (ferro-resonant Lester type transformer) cuts back to 2A. If > any one cell hits 4.0V, stop charge & display OV fault (scanner catches > which one). When all are 3.6V or DV/DT=0 stop. > > > > Have a renewable energy day, > > mark www.REEVAdiy.org > > > > Date: Tue, 5 Nov 2013 12:35:29 -0500 > From: Mark Hanson <[email protected]> > To: "[email protected]" <[email protected]> > Subject: [EVDL] LiFePO4 Miles on EV's > Message-ID: <[email protected]> > Content-Type: text/plain; charset="iso-8859-1" > > Hi Ben etc, > > > > I'm in Roanoke, VA (see below) & charge/discharge twice daily, 60-70 miles > total per workday about 350 miles per week. On week-ends I run errands Sat > & Sun about 16-30 miles. The batts are just mounted on the erector set > bracketing you get at Lowe's, no special heating/cooling. > > > > Have a renewable energy day, > > Mark > > www.REEVAdiy.org > > > > Hi Mark, > > Can you comment on how aggressively you use your batteries? What climate > are you in? > Do you cool/heat the batteries? > > I have the same batteries so I'm curious. > > thx > > -ben > www.evalbum.com/4001 > > Hi Ben etc, > > > > I charge to 3.6V per cell dv/dt=0 similar charger I've used on Pb and > ni-cads, when the voltage stops rising on the entire pack .01VPC = stop. > > On Oct 22, 2013, at 7:17 AM, Mark Hanson <[email protected]> wrote: > > > Hi Folk's, > > > > > > > > With the talk of miles on your LiFePO4 EV's, I just turned 20k on my set > of 36ea 130ah CALB batteries. When I ran lead many moons ago, 10k miles was > about it. Hopefully I'll get 60k on the Lithiums since they are 6X more > expensive than lead & what the manufacturer claims 3K cycles or 60k miles. > > > > > > > > Have a renewable energy day, > > > > > > > > Mark in Roanoke, VA > > > > www.REEVAdiy.org > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20131107/12ef3a2e/attachment.htm > > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > For EV drag racing discussion, please use NEDRA ( > http://groups.yahoo.com/group/NEDRA) > > -- Put this question to yourself: should I use everyone else to attain happiness, or should I help others gain happiness? *Dalai Lama * Tell me what it is you plan to do WIth your one wild and precious life? Mary Oliver, "The summer day." To invent, you need a good imagination and a pile of junk. Thomas A. Edison<http://www.brainyquote.com/quotes/quotes/t/thomasaed125362.html> A public-opinion poll is no substitute for thought. *Warren Buffet* Michael E. Ross (919) 550-2430 Land (919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Google Phone (919) 631-1451 Cell (919) 513-0418 Desk [email protected] <[email protected]> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20131107/7023ea82/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
