Reason is that Li-Ion batteries are sized by Ah so it is normal to say what size (Ah) battery cells you have, if you want to indicate which version cells are in your pack, but if you want to tell the energy in the pack then it only makes sense if you tell (or know) the average pack voltage to arrive at the kWh rating from Ah * Volts, or simply talk about kWh.
Cor van de Water Chief Scientist Proxim Wireless Corporation http://www.proxim.com Email: cwa...@proxim.com Private: http://www.cvandewater.info Skype: cor_van_de_water Tel: +1 408 383 7626 -----Original Message----- From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of Larry Gales via EV Sent: Tuesday, July 08, 2014 11:18 PM To: email@example.com Subject: [EVDL] Question about amp-hr 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 -- Larry Gales -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140708/122a cf6c/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) _______________________________________________ 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)