Simple answer I use is that 12 full size home panels can fully charge a typical EV to the American average 40 miles a day forever.
But it is far mor economical to put those on the roof of your house or garage than on the car. bob On Sun, Oct 21, 2018 at 7:13 PM, Larry Gales via EV <[email protected]> wrote: > To look at this further, let us consider the solar energy available in the > Seattle area (again, the worst in the continental USA) over the year. The > results, in terms of sun-hours/day are: > > Jan Feb Mar Apr May Jun Jul Aug > Sep Oct Nov Dec > > 0.92 1.65 2.88 4.04 5.47 6.06 6.23 4.98 > 3.85 > 2.09 1.15 0.74 > > > > Let us assume that we travel 20,000 miles/year (the US average for a 2-car > family) which consume about 28,000 kWh of energy/year, when we convert the > fuel consumed to kWh. Let us assume we travel less in the Winter, at about > 40 miles/day (at total of 6000 miles for those 5 colder months): > > > > · During the 5 colder months the PV on the car delivers only 20 > miles/day, so we need an extra 20 miles/day of energy from the utility. > Given > that the car gets 20 miles/kWh, then for 5 months we need (5*30*20)/20 = > 150 kWh that we need to get from the utility. > > > > · But during the remaining 7 months of the year, we get an average > of 71 miles/day from the PV array on the car, but since we only travel an > average of 67 miles/day, we don’t need any extra energy. > > > > > > If we add the embedded energy needed to create the solar PV array, where we > assume that a 1.5 kW array produces an average of 1500 * 1.2 kWh/year, and > at the standard 3.7 payback years for solar PV that comes to 6,660 kWh. > Over > a 30 year lifetime that comes to 222 kWh/year + 150 kWh/year or 372 > kWh/year total, *which is 75 times less* energy than what the average > family now consumes, yet we travel the same speeds for the same distance. > > > > Although the Stella Lux or Stella Vie are not in production they are street > legal (at least in Europe) cars and have been making tours around Europe > for over a year. The team is considering developing a production car, > named “Lightyear”, which uses most of the same technology. > > On Sun, Oct 21, 2018 at 3:34 PM Peri Hartman via EV <[email protected]> > wrote: > > > The Stella is an awesome example of what can be done. Aside from what > > Lee says, which I think is one area of resistance, another big problem > > is need for a variety of uses. > > > > What I mean is I (or you or the huddling masses...) want something that > > works for a 15 mile solo commute, works to take the family out to > > dinner, works to go skiing (hiking, fishing, hunting, ...) for the day, > > and works to go out of town for the weekend. I think the Stella might be > > able to do the first two, for a large percentage of people. The latter > > two? I doubt it. > > > > Now, for going out of town, it wouldn't be too hard to make arrangements > > to easily pick up a rental. The other case gets harder. You have a lot > > of elevation gain, meaning you'll need a pretty hefty battery since > > solar isn't going to be anywhere near adequate. That means the car gets > > super heavy - like a Tesla - and now the benefits of the Stella are > > impossible. This usage, too, could be handled by a rental. But I doubt > > most people are willing add two hours to an already long day in order to > > use a rental. On top of that, most rental companies don't permit you to > > drive on unpaved roads. > > > > If we, eventually, have autonomous vehicles, perhaps you'll be able to > > own a car for your special purpose activities and fetch one for your > > daily usage. Then, Stella-like vehicles become a real option, I think. > > > > Peri > > > > ------ Original Message ------ > > From: "Lee Hart via EV" <[email protected]> > > To: "Electric Vehicle Discussion List" <[email protected]> > > Cc: "Lee Hart" <[email protected]> > > Sent: 21-Oct-18 2:56:18 PM > > Subject: Re: [EVDL] EVLN: The physics of slapping solar panels on cars > > > > >Larry Gales via EV wrote: > > >>When I look at the Stella Lux and Stella Vie, I get very different > > >>results > > >>from the negative views of solar powered cars. I start with the > > >>assumption > > >>that the Dutch students who have won most of the solar car records are > > >>not > > >>actually lying. > > > > > >The problem is that most people assume that EVs must be exactly like > > >ICEs. Typical ICEs today weigh a ton or more, and have the aerodynamics > > >of a brick. All those edgy lines, huge grilles, big fat tires, and > > >rough bottom mean it takes lot of horsepower to drag it down the road. > > > > > >The automakers are building EVs the same way. Big, heavy, poor > > >aerodynamics. > > > > > >But there are other ways to do it. Race cars and airplanes are much > > >lighter, and have aerodynamics based on performance rather than > > >styling. Amory Lovins has been championing the "hypercar" concept for > > >decades. The basic idea is that if you halve the weight, and cut the > > >aerodynamic losses in half, it takes 1/4th as much energy to push it > > >down the road. Yet it can be just as strong and safe, by using modern > > >materials and construction techniques. > > > > > >EVs like Stella Lux and Stella Vie demonstrate how successful this > > >strategy can be. When you have a 4-passenger car that weighs 826 lbs > > >and 1/3 the aerodynamic losses, solar power becomes a viable way to > > >power it! > > > > > >-- Obsolete (Ob-so-LETE). Adjective. 1. Something that is simple, > > >reliable, straightforward, readily available, easy to use, and > > >affordable. 2. Not what the salesman wants you to buy. > > >-- > > >Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com > > >_______________________________________________ > > >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) > > > > > > -- > Larry Gales > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/ > attachments/20181021/d73732e7/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) > > -------------- next part -------------- An HTML attachment was scrubbed... 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