(Eight hours of charging Tesla’s Model 3 from a wall socket will
give you your expected 200-plus miles of range.)
Someone's math is off. You can only get 1KW/h from a wall socket.
Maybe 30
miles in 8 hours.
On Saturday, December 8, 2018, 8:05:15 PM CST, brucedp5 via EV <
ev@lists.evdl.org> wrote:
https://qz.com/1482588/why-teslas-dont-and-cant-have-solar-roofs/
Why Teslas don’t—and can’t—have solar roofs
December 3, 2018 Kabir Chibber
[images
https://cms.qz.com/wp-content/uploads/2018/12/RTX1A0WZ.jpg
The only solar-powered cars that work
https://cms.qz.com/wp-content/uploads/2018/12/RTS1WEN8.jpg
The Sono prototype / REUTERS/Andreas Gebert
]
It’s a pretty intuitive question. “Why don’t electric cars have solar
roof[s?]” asked one person in the “No Stupid Questions” area of
Reddit.
“Wouldn’t it make sense to have a self sustaining charging
capabilities.”
There are similar questions on Quora and elsewhere.
Teslas and other cars run off electricity, drawing from an
electric-power
infrastructure that often runs off of dirty fuels. Solar power
generates
lots of electricity for free from the sun. Why don’t electric cars
have
solar roofs to power them for free?
For one thing, the math makes it quite difficult. Elon Musk briefly
suggested that solar roofs would be an option for the Tesla Model 3,
but
later walked it back and explained why. “Putting solar panels on the
car
itself?” Musk said in July 2017. “Not that helpful, because the actual
surface of the car is not that much, and cars are often inside. The
least
efficient place to put solar is on the car.” It turns out that he had
meant
a solar roof that unfolds from the trunk and overs the current car
hood.
A Tesla rival, the Karma Revero, actually has a solar roof as an
option. As
Wired noted (paywall), modern solar panels are inefficient and convert
just
15-20% of the energy that reaches them. So that Revero solar roof,
having
received eight hours of pure sunshine, will generate enough power to
drive
1.5 miles. (Eight hours of charging Tesla’s Model 3 from a wall socket
will
give you your expected 200-plus miles of range.)
On Quora, Chris Harget, a product-marketing manager in the Bay Area,
summarizes the problems (emphasis added by him):
The top of an electric car has maybe 3–5 square meters of flat
space.
Solar panels, even at high noon, usually only produce about 200
watt-hours per square meter.
The most efficient production electric vehicles today (probably
the
Hyundai Ioniq and the Tesla Mod 3) would only be able to travel 2–4
miles
on
that amount of electricity…in an hour. Most people could walk faster.
Financially, the cost of the panels and electronics, R&D and
assembly
would never pay for itself in the life of the vehicle, compared to
charging
from the wall in your garage.
That doesn’t mean no one is trying. There’s a German startup called
Sono
Motors that wants to build cars with solar panels. Toyota last year
announced that upcoming Prius hybrid cars would come with Panasonic
solar
roofs (paywall).
Still, even as solar panels become more common and more efficient,
they
won’t be on most cars anytime soon.
[© qz.com]
+
https://www.businessgreen.com/bg/news/3067447/vattenfall-begins-rollout-of-wind-powered-ev-chargers-in-norfolk
Vattenfall begins rollout of wind-powered EV chargers
04 December 2018 Vattenfall is set to begin rolling out its first UK
electric vehicle (EV) chargers in Norfolk this week, after today
announcing
a new partnership with BMM Energy ...
https://www.businessgreen.com/w-images/0e05a981-078a-438e-a16e-cca8813b0f5f/3/InchargeatPyC-580x358.jpg
For EVLN EV-newswire posts use:
http://evdl.org/archive/
{brucedp.neocities.org}
--
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