This actually makes sense - especially if you have lots of batteries in
the RV as well. I think it would also be possible to use the EV as the
Large Battery for your RV, but Tesla may not allow such a modification.
Cheers, Peter
On 10/22/18 6:47 AM, Bobby Keeland via EV wrote:
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.
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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}
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