In addition a 70Ah battery should do 145 amps continuous with no problem. You might want to check the peak currents when accelerating
Sent from my iPhone > On Sep 14, 2018, at 12:36 PM, Damon Henry via EV <[email protected]> wrote: > > Ummm, actually you failed to ask a question... > > The principle behind what you are talking about is that in an EV Volts X Amps > is equal to Power (Watts) and it requires a certain amount of power to > maintain a certain speed. If you drop the voltage of your pack it will then > require more amps to maintain the same speed. In this case, it takes 85 x > 120 = 10.2 kw to drive 55 mph. If you lower your pack voltage to 70 then > 10200 / 70 = 145.71 amps to maintain 55 mph. > > This is the straight math. There are other factors involved as well. Can > your overall system maintain 70 volts at 145 amps. My guess is that it can > because most of the components that people build EVs with work fine in this > range, but it is generally harder on all of your components. > > Without more specifics that is the best I can answer your implied question. > > Damon > > Damon > ________________________________ > From: EV <[email protected]> on behalf of ken via EV > <[email protected]> > Sent: Thursday, September 13, 2018 11:18 PM > To: Electric Vehicle Discussion List > Cc: ken > Subject: [EVDL] decreasing pack voltage > > I have a 85 volt system that draws 120 amps at 55 mph, but want to lower > my pack count (I found brand new cells ) but to do only top speed of 40 > mph . > > at 40 mph my voltage is 70 volts and 40 amps, Am i asking a oboius ? the > cells are 70 ah . > > _______________________________________________ > UNSUBSCRIBE: > https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.evdl.org%2Fhelp%2Findex.html%23usub&data=02%7C01%7C%7C95d6bc500de44a4d03b208d61a09f33a%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636725027361552683&sdata=Q%2Bs3sACO0XmugvJaLq6Z%2BnOZETq5XyaRU2g3q4zpNRg%3D&reserved=0 > https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.evdl.org%2Flistinfo.cgi%2Fev-evdl.org&data=02%7C01%7C%7C95d6bc500de44a4d03b208d61a09f33a%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636725027361552683&sdata=ZyYpltnHO%2BQNs9SdcJlIF5Z08nnon4Vu9ViJcLnxmQ8%3D&reserved=0 > Please discuss EV drag racing at NEDRA > (https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fgroups.yahoo.com%2Fgroup%2FNEDRA&data=02%7C01%7C%7C95d6bc500de44a4d03b208d61a09f33a%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636725027361552683&sdata=FxLPkagjqBQ%2B4xJz%2Fy8ZDgQPRaoJNcF8YlcaLl44cHs%3D&reserved=0) > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20180914/a75625d2/attachment.html> > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Please discuss EV drag racing at 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 Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
