I think it is key to remember, though, that a Cd of 0.16 is deep into concept car territory. Most small cars are 0.28-0.32. The Toyota Prius is 0.25. The Tesla Model S is 0.24. There isn't much under 0.24 that isn't concept or experimental (except the EV1 at 0.195).
https://en.wikipedia.org/wiki/Automobile_drag_coefficient I'm surprised the Leaf doesn't do better in the city. Does it brake aggressively enough with regeneration so you don't need the friction brakes much? I have to drive the Tesla very aggressively to get less than 3 miles per kWh. On a bad day, I get around 300 Wh per mile. On a careful day, I can get around 230-250 Wh per mile. However, due to aggressive regeneration, it gets almost everything back into the battery. I hardly use the friction brakes. Mike On September 28, 2015 2:39:45 PM MDT, Peri Hartman via EV <[email protected]> wrote: >I think the key factor is the Cd of .16. While I think lighter >vehicles are better for many reasons, it doesn't seem to make that much > >difference in efficiency unless you are spending most of your time on >slow speed city streets. > >For example, my Leaf gets about 1.5 - 2.5 miles per kWh (depending on >accessories and temperature) on city streets where I live. But if I go > >60mph on the freeway, I can sometimes get 4 miles per kWh. > >Peri > >------ Original Message ------ >From: "Lawrence Rhodes via EV" <[email protected]> >To: "[email protected]" <[email protected]>; >"[email protected]" ><[email protected]> >Sent: 28-Sep-15 1:31:45 PM >Subject: [EVDL] EVLN: The Big EV Debate> Go for Small or Big Battery >Pack? > >>The debate should be about light or heavy vehicles and efficiency. >If >>you have an efficient vehicle that is light you might draw 55wh per >>mile. The typical heavy conversion like the I3 , Leaf, Rav4, IMEV, or > >>any other of the currently available EV's are just too heavy to give >>good range with a small pack. They all draw 200 or more wh per mile. > >>The I3 is going in the right direction. It has a relatively small >pack >>and is more efficient than all the other competitors. If however >you >>have a light vehicle around a thousand pounds your range will be close > >>to 350 miles with a 16kw battery pack. The vehicle needs to have a CD > >>of about .16. With these specifications you don't have to have a big >>pack. It will charge in 2.5 hours with a 6.6kw charger. Efficiency >>and charging time should be the goal. Smaller the pack the quicker >the >>charge. Also the packs will last longer as they are not stressed as >>much by carrying large weights. Engineering the right combination is >>what is needed. Not 85kw packs in 5000 pound cars...however they are >>very comfortable and useful as is and better than the ICE alternative. > >>Lawrence Rhodes >>-------------- next part -------------- >>An HTML attachment was scrubbed... >>URL: >><http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20150928/dcb4a2f9/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)
