Martin, Since I've never actually used 6 volt batts I am not sure what exactly it would cost. I'm sure there would be a range depending on brand (which will influence batt life expectancy as Lee and others have pointed out before).
For my 8 volt batts (lasting 2 years) I just priced out a set of 15 trojan t875s for my 120 volt pack at $2040. For the 18 you would need for a 144 volt pack that would be $2348. I imagine you'll want to tell me that with the much longer life of lithium (and the minimal Peukert effect) that my cost per mile would be noticably less. I am aware of that but I don't have that kind of cash available. And I am not prepared to go into debt to get them especially for my truck which is already almost 17 years old (it's nothing special). Fyi - I've done the math and the combination of batt replacement cost and electric costs for my 8 volters puts me at about break even for a comparable ICE truck (assuming $3.50 per gallon for gas). That's just fine by me since I am cutting my carbon footprint in about half. Peter On Oct 3, 2013 12:23 AM, "Martin WINLOW" <[email protected]> wrote: > Hi Peter, > > Would you be prepared to tell us all what that 3.5 years of lead cost? Be > honest, now! > > MW > > > On 2 Oct 2013, at 16:10, SLPinfo.org 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 > >>> > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20131003/6d915057/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/20131003/43e602ea/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)
