That is right, Kilo Watt Hours is the proper trom for total energy quanity. the voltage and the ampere hours are terms best quantified by the system design engineer. If you are qualified to design you understand the ratios of voltage and maximum current draw versus the demand of the load. As well as maximum charging rate. Because, the maximum load current and charging rate are specified as multiples of the amp-hour specification, usually.
*Dennis Lee Miles * *Director **E.V.T.I. Inc.* *E-Mail:* *evprofes...@evprofessor.com* <evprofes...@evprofessor.com> *Phone #* *(863) 944-9913* Dade City, Florida 33523 USA On Thu, Jul 10, 2014 at 11:28 AM, Martin WINLOW via EV <ev@lists.evdl.org> wrote: > Larry - You are right. Amp-hours on its own doesn't really mean much at > all. Except, of course, that most modern EVs have battery/traction packs > in the ~300V bracket and most batteries used in such vehicles have cell > voltages in ~3-4V range so, depending on the context, an Ah rating gives > the casual observer some idea of the pack/cell energy content. But it is > not a terribly precise number/unit to bandy about! kWh is best. MW > > > On 9 Jul 2014, at 07:17, Larry Gales via EV wrote: > > > I know that watts = amps * volts, and watt-hours (wh) is a measure of > > energy, but over and over again I hear people talking about EV batteries > in > > terms of amp-hours. What does that mean if you don't know the voltage? > > 1000 amp-hr is not impressive if the voltage is, say, 0.00001 volts. Is > > there some sort of standard voltage, e.g., 3.6 volts, that is assumed > when > > one talks about LiON batteries? Does amp-hours tell you something more > > than watt-hours? > > > > Thanks in advance,-- > > Larry Gales > > > > _______________________________________________ > 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/20140710/add732b8/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)
