My wife and I are on the waiting list for a 220 mile range Model 3. We don't need the 310 mile range or the high performance.
When we travel it is usually by motorhome. I've thought about towing the EV on a trailer that is covered with solar panels. A recharge while boon docking would be no problem. BobK On Mon, Oct 22, 2018, 8:41 AM Robert Bruninga via EV <ev@lists.evdl.org> wrote: > ALL EV's are predominantly charged while parked. Solar panels on EV's are > not for propulsion power but for battery charging during the 8 to 16 hour > solar day while parked in the sun, not just the 30 minutes the car is in > use. This is for those without a dedicated charger at home. > > Bob > > > -----Original Message----- > From: EV <ev-boun...@lists.evdl.org> On Behalf Of Alan Arrison via EV > Sent: Sunday, October 21, 2018 7:26 PM > To: ev@lists.evdl.org > Cc: Alan Arrison <bigg...@comcast.net> > Subject: Re: [EVDL] EVLN: The physics of slapping solar panels on cars > > The numbers don't add up for solar panels on automobiles, never have, never > will. > > This has been proven time and time again. > > There is no way it gets even 20 miles per kWh under anything but perfect > conditions and slow speeds. > > And the energy from the panels again is under perfect conditions. > > It is so light because it has almost no crash protection. > > Al > > > > On 10/21/2018 3:09 PM, 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. So, the specs for the 4 passenger > > Stella Lux include these: > > > > > > > > Length > > > > 178 inches > > > > Width > > > > 69 inches > > > > Height > > > > 44 inches > > > > Weight > > > > 826 pounds > > > > Battery Capacity > > > > 15 kWh > > > > Motor Efficiency > > > > 97 percent > > > > Range on sunny day (Netherlands) > > > > 621 miles > > > > Range on sunny day (Australia) > > > > 683 miles > > > > Range at night (on battery) > > > > 403 miles > > > > Top Speed > > > > 77 mph > > > > > > > > So, if the range at night is 403 miles and the battery is 15 kWh, that > > translates to 26.8 miles/kWh. Let us suppose that is under ideal > > conditions, and that a more realistic value is 20 miles/kWh. The > > solar PV array is 1.5 kW, so a more realistic value under real world > > conditions is > > 0.75 kW. In Seattle, where I live, which has about the worst solar > > potential in the USA, the average solar intensity in July is 6.3 sun > > hours. > > So, (0.75 * 6.3 * 20) = 94.5 miles. If we usually travel only 40 > > miles/day, I could easily see traveling 200 miles on accumulated solar > > energy, after, say, a week of 40 miles/day travel. And given that 5 > > months/year we average over 60% of the July values we can travel about > > 60 miles/day just on stored sunlight from the car. And the 5 > > passenger Stella Vie is just as efficient. > > > > On Sun, Oct 21, 2018 at 12:09 AM brucedp5 via EV <ev@lists.evdl.org> > > wrote: > > > >> > >> https://qz.com/1423288/why-dont-we-have-solar-powered-cars-physics/ > >> The physics of why we don’t have solar-powered cars October 15, 2018 > >> Michael J. Coren > >> > >> [image > >> https://cms.qz.com/wp-content/uploads/2018/10/image1-e1539387897807.p > >> ng > >> The Sono Motors Car > >> ] > >> > >> The nuclear furnace at the center of solar system powers almost > >> everything on earth. Photosynthesis, wind, and even fossil fuels > >> (once decomposed living matter) all derive in some way from the star we > >> call the Sun. > >> > >> So why isn’t it enough to power our cars? > >> > >> It’s all about energy density: how much energy falls on a surface > >> relative to how much is consumed. We can have solar powered e-bikes > >> that cover thousands of miles, sailboat drones that cross oceans, > >> even ultra-light aircraft that circumnavigate the globe. What do they > >> have in common? > >> They’re > >> all very light, slow, and consume a trickle of electrons. Solar > >> panels generate just enough electricity to keep them moving. > >> > >> For anything weighing thousands of pounds, like a car, the energy > >> equation is daunting. A few intrepid carmakers are slapping solar > >> panels on their vehicles anyway. Few have gotten very far. The German > >> startup Sono Motors is adding 330 integrated solar cells on the roof, > >> sides, and rear to give its vehicle a 30-km boost out of a 250-km > >> (155-mile) battery range. Meanwhile, Dutch startup behind > >> LightyearOne claims its electric car will “charge itself.” Although > >> it has yet to unveil a vehicle, potential customers can put down > >> deposits for a €119.000 ($157,000) car promising to travel 10,000 to > >> 20,000 km per year (6,200 to 12,400 miles) on its solar panels alone. > >> > >> The Sono Motors Car > >> > >> Will it work? Don’t bet on it, says Jeremy Michalek, a professor of > >> mechanical engineering at Carnegie Mellon University and director of > >> its Vehicle Electrification Group. > >> > >> Quartz asked Michalek to estimate how far the best solar panels could > >> propel a typical electric car on the market. He broke down the math > >> for us. > >> > >> Michalek says about 1 kilowatt (kW) of solar energy falls on a square > >> meter of the Earth’s surface on a clear day. That’s all the solar > >> energy available to collect. For a company like Sono, which says it > >> can convert about a quarter of that energy into electricity (although > >> that’s very optimistic), a full site of panels might generate roughly > >> 8 kilowatt hours of energy per day (a best-case scenario with four > >> square meters of solar panels). > >> > >> Michalek says that’s enough to drive a car like the comparable Nissan > >> Leaf about 25 miles. But there are many reasons (clouds, poor panel > >> positioning, dirt), this number will rarely be reached. As for > >> LightyearOne and its claims that you’ll never need to charge your car > >> in the future? The odds are tough. The maximum conversion rate for > >> cheap silicon cells to turn sunlight into electricity is just under > >> 33%, and more exotic materials that achieve 44% efficiency are far > >> too expensive for mass production. Without a revolutionary > >> breakthough in solar panel technology, cars that can recharge > >> themselves with the sun alone remain fantastical. > >> > >> Does that mean putting solar panels on cars is always a bad idea? > >> Maybe not. > >> A sunny day can tack on enough miles to cover the average US commute. > >> But Michalek says that’s an expensive way to extend the car’s range. > >> Anyone with a charging outlet can get renewable energy from the wall > >> for a lot less. > >> Sign up for the Quartz Daily Brief email Stay updated about Quartz > >> products and events. > >> [© qz.com] > >> > >> > >> + > >> > >> https://www.nbcnews.com/tech/tech-news/driverless-car-hype-gives-way- > >> e-scooter-mania-among-technorati-n919706 > >> Driverless car hype gives way to e-scooter mania among technorati > >> Oct. 13, 2018 Driverless car hype gives way to e-scooter mania among > >> technorati ... In a matter of months, electric scooter startups have > >> gone from tech oddity to global ... Millions of dollars in funding > >> and billions of dollars in valuations have made scooters the next big > >> thing since the last big thing ... > >> > >> https://media3.s-nbcnews.com/j/newscms/2018_28/2491731/180709-bird-sc > >> ooter-san-francisco-njs-1541_0d7cd3431408077aac647d098c7ba8a7.fit-124 > >> 0w.jpg > >> > >> > >> > >> > >> For EVLN EV-newswire posts use: > >> http://evdl.org/archive/ > >> > >> > >> {brucedp.neocities.org} > >> > >> -- > >> Sent from: > >> http://electric-vehicle-discussion-list.413529.n4.nabble.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) > _______________________________________________ > 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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