I agree. I did this calculation when I converted a Toyota Celica. Weight was dominant at slow speeds. I believe the two crossed at around 60mph and aerodynamics became dominant. In fact, Jack Richard came up with a rule of thumb that was real close on my conversion. Weight / 10 = wh per mile. My car is 3100 lbs with me in it or 310wh/m I have 13kw battery and my car does around 40 miles on a charge normal driving. Tesla beats this because their battery weight to vehicle rate ratio is bigger.
Sent from my Verizon, Samsung Galaxy smartphone -------- Original message --------From: Peri Hartman via EV <[email protected]> Date: 5/4/16 10:26 AM (GMT-06:00) To: Michael Ross <[email protected]>, Electric Vehicle Discussion List <[email protected]>, EVDL Administrator <[email protected]> Subject: Re: [EVDL] EVLN: Upgraded 2016 Tesla-S 90D is the first 300mi/483km production Electric car There's always a crossing point. At 1mph, rolling resistance is by far the dominant factor. At 70mph, for most vehicles, air resistance is by far the dominant factor. At some point, these factors are 50-50. For a "slippery" car, that point will be higher than for a non slipper car. But rolling resistance wasn't the only factor brought up. The other principal factor is the losses from regen. You don't get 100% of the energy back, even if there were no air resistance. Empirical data seem to show that city driving with a lot of stop & go and a lot of hills significantly increase the energy/distance usage. Peri ------ Original Message ------ From: "Michael Ross via EV" <[email protected]> To: "Electric Vehicle Discussion List" <[email protected]>; "EVDL Administrator" <[email protected]> Sent: 04-May-16 8:18:18 AM Subject: Re: [EVDL] EVLN: Upgraded 2016 Tesla-S 90D is the first 300mi/483km production Electric car >Weight is NOT a dominant factor. Air resistance trumps it by at least >an >order of magnitude. Combined rolling resistance is dependent on contact >patch size which is why semis are pumped to 100psi. With good active >suspension you can have high inflation pressure tires and not >compromise >ride quality or rolling resistance. > >People always think RR is big deal because if you keep the pressure up >it >becomes a big deal. >On May 3, 2016 3:45 PM, "EVDL Administrator via EV" <[email protected]> >wrote: > >> On 3 May 2016 at 8:53, tomw via EV wrote: >> >> > The S uses quite a bit more power on accessories than most >>conversions, >> > and most drivers likely usually have climate control on. >> >> But that wouldn't affect EPA range ratings, would it? Aren't those >> measured >> with aircon and other stuff turned off? >> >> Or is it burning off energy on accessories that CAN'T be turned off? >>That >> would kind of stink. :-( >> >> > It also has a very low drag coefficient, so low that it has the >>same >> > CdA as my little Suzuki Swift. That, and its 4700+ lb weight >>results in >> > its drag and rolling resistance forces being equal at around 60-65 >>mph >> > compared to around 45 mph for most vehicles. >> >> Yeah, I'd forgotten, it's (please forgive me) an obscenely heavy car. >> >> So friction losses are dominant. Hmm. >> >> > The energy/mile used moving at ~ constant speed in city driving >>would >> > have to be low enough relative to highway driving to compensate for >> > that energy lost during each acceleration, and that will depend on >> > distance driven between stop/starts. >> >> Here again, the EPA method enforces a formula. So I wouldn't think >>this >> would affect Teslas more than other EVs. >> >> What is incontestable is that the Leaf's city range is greater than >>its >> highway range, but the Tesla's city range is SHORTER. It's hard to >>avoid >> the notion that a Tesla acts more like an ICEV than other EVs do, >>wasting a >> significant amount of energy "idling." Ouch. >> >> David Roden - Akron, Ohio, USA >> EVDL Administrator >> >> = = = = = = = = = = = = = = = = = = = = = = = = = = = = = >> EVDL Information: http://www.evdl.org/help/ >> = = = = = = = = = = = = = = = = = = = = = = = = = = = = = >> Note: mail sent to "evpost" and "etpost" addresses will not >> reach me. 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