That depends are the vehicles ability to regenerate as well. I believe my miev will only regen at 100 amps but I could burn more than 100 amps going up depending on my speed.
Sent from my iPhone > On May 4, 2017, at 5:17 PM, Cor van de Water via EV <[email protected]> wrote: > > From a Physics perspective, adding elevation increases your potential > energy (which comes out of the battery in an EV) > Which you gain back upon descent. > Formula: Ep = mgh > In Earth's gravitational field, near earth the g = 9.81 > m is mass in kg > h is height in meters. > > So, using some random rounded numbers (fill in your own favorites and > repeat): > m = 2,000 (4400 lbs truck) > h = 300 (almost 1000 ft as was the question) > and let's assume it is a pickup truck, so it needs about 350 Wh per mi, > so 4 mi equates to 1.4 kWh of energy. > > Ep = 2,000 x 9.81 x 300 ~ 6M (rounding 9.81 to 10 we get 6 million) > Joules. > One Joule is equivalent to one Watt-second. > So, one Watt-hour is 3600 Joules (since there are that many seconds in > an hour) > 6M / 3600 = 1,667 Wh = 1.7 kWh > > Indeed, an elevation gain of 1,000 ft (~300 meters) for a 4,400 lbs > truck costs at least as much energy as going 4 miles on flat road. > In fact, for the relatively heavy truck it is even over 5 miles. > For a lighter car, the amount of energy invested in elevation change > might be less. > > NOTE that this energy is *on top of* the distance you'd need to drive to > get this elevation change. > So, if you take this truck, drive 3 miles to gain 1,000 ft then the > battery SoC would look as if you had done 3 + 5 = 8 miles. > And, you might need to account for higher losses in the components at > higher power level as well, but that is a secondary effect. > > If you turn that truck around to go down 1,000 ft in 3 miles, the > battery will be re-charged with the difference between > The 3 miles you are driving and the 5 miles of range you are > recouperating from the height change, so your SoC should > Regain 3 + -5 = -2 miles. As a result, the SoC is showing the total of 8 > + -2 = 6 miles after driving 3 miles up and 3 miles down > And ending up at the same height as you started. Laws of Physics still > intact. > Hope this clarifies, > Cor. > > -----Original Message----- > From: EV [mailto:[email protected]] On Behalf Of Robert Bruninga > via EV > Sent: Wednesday, May 03, 2017 8:06 PM > To: Electric Vehicle Discussion List > Subject: [EVDL] EVs and altitude? > > I think I saw a reference that every 1000' climb in elevation is about > the same as 4 miles on level ground. Is that the general rule of thumb > for EV's? > > Bob, WB4APR > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20170503/35bc > a999/attachment.htm> > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Read EVAngel's EV News at http://evdl.org/evln/ 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 > Read EVAngel's EV News at http://evdl.org/evln/ > 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 Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
