Having tried to run an EV from 12 volt batteries (100AH AGMs), I'd agree that they are not up to the task of running a car, at least a 72 volt one. The amperage draw required (250A) is too much for them, and I was only getting 8 to 10 miles before voltage sag was too much. We're switching to lithium, because the car can't handle the weight of more lead.
There are some 12 volt 180AH batteries (sometimes called floor sweeper batteries) that might hold up better, but they are almost twice the height of a golf cart battery, so would require completely different places to put them. Z On Wed, Oct 2, 2013 at 9:10 AM, SLPinfo.org <[email protected]> wrote: > Sam, > > The range would be quite different because 6 volt batts have greater > Amp-Hour (AH) capacity than 12 volt. Typical 6v golf cart batts hold > 200-220 AH while most 12v batts only hold 100-120 AH. > > Using the 144V system in your example, here's the difference: > > (6 volt) 144 volts X 210 AH X 0.8 (max discharge) X 0.57 (correction for > Peukert effect) = 13,789 useable watt hours > > (12 volt) 144 volts X 110 AH X 0.8 (max discharge) X 0.57 (correction for > Peukert effect) = 7223 useable watt hours > > If we assume you'd use 350 Watt Hrs per mile (varies depending on the > vehicle) you'd get about 39 miles range with the 6 volt batts and only 21 > miles range with the 12 volt batts. > > Another crucial factor is that 12 Volt batts (no matter what the salesmen > tell you) just are not up to the task of an EV. They will die on you > quickly. I tried two different sets and both only lasted about 9 months. > > btw - you could also consider 8 volt golf cart batteries (that's what I > did) which would hold 150-180 AH. They are sort of a compromise between > the two and would get you range somewhere in the middle. They wouldn't > last quite as long as the 6 volts, but mean less weight to carry around. > > Also my 8v batts have gone about 2 years now and are just about ready to be > replaced. I'm told that 6 volt batts typically go 3 1/2 to 4 years. > > - Peter Flipsen Jr > > > > > On Wed, Oct 2, 2013 at 7:33 AM, Sam Shepherd <[email protected]> > wrote: > > > In the same auto what would be the difference in range between 6 volt and > > 12 voltlead acid? > > Like 24 6 volt next to 12 12 volt? > > -------------- next part -------------- > > An HTML attachment was scrubbed... > > URL: < > > > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20131002/2e8ad7be/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) > > > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20131002/b9bb1441/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) > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20131002/2ba6275f/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)
