I think a formula of 1.5kw of panels for every 1000 pounds of vehicle might be
a good working formula. If you want the panels to push the vehicle. LR
From: jerry freedomev <[email protected]>
To: Electric Vehicle Discussion List <[email protected]>
Cc: Lawrence Rhodes <[email protected]>
Sent: Wednesday, September 27, 2017 5:23 PM
Subject: Re: [EVDL] Solar vehicles..just do the math.
Hi Lawrence and All,
A solar RV can be done if one keeps it
light, aero one large enough to live in with 6' standing headroom in some
places by making a composite body like a cut off teardrop but instead use curve
flat panels for the roof, , sides and a flat floor.
Using gentle curves can give you an under
.20DC little larger than a standard van with shower, kitchen, head if a good
designer. We do it all the time in boats. And can be done in 2k lbs if one
works at it.
The rear will be 85% of the widest part
that a solar panel folds down to cover and as shade, rain cover when folding
out to catch more solar when parked
If one drives 55 mph it will only need 7kw
or so correctly done with a 24kwh pack is 160 mile range.
There are 1/16" thick solar cells on thin
strong plastic film that are clean enough to be aero, very low weight and IIRC
17% or so efficient made for flexible panels would be far better, lighter than
anything else.
So on the roof would be 10 sq yards giving
about 1.7kwh or so at noon gives say 8kwh/day seriously helps range getting to
maybe 50 added miles. Parked charged more like 10kwh plus 4 more sq yards of
folding solar giving another 3kwh/day
So you'd average 60-80 mpd from just solar,
minus use. Assuming you didn't use more fold out lightweight solar panels
gaining even more range/day.
Jerry Dycus
--------------------------------------------
On Wed, 9/27/17, Lawrence Rhodes via EV <[email protected]> wrote:
Subject: Re: [EVDL] Solar vehicles..just do the math.
To: "[email protected]" <[email protected]>, "Electric Vehicle Discussion List"
<[email protected]>
Cc: "Lawrence Rhodes" <[email protected]>
Date: Wednesday, September 27, 2017, 5:52 PM
The whole point with a solar
vehicle is to be completely free of the grid most of the
time. Charging from your roof solar is not bad but not
optimal. You can't charge with your roof top solar
unless you are home. So when your car is parked usually
away from home that is when you need it. A vehicle the size
of a Tesla S can hold at least 1.5kw....maybe a little
more...BTW you can't just use solar panels on the roof
of a vehicle. You need special encapsulation for weight
and aerodynamics. Lawrence Rhodes
From: Sean Korb <[email protected]>
To: Lawrence Rhodes <[email protected]>;
Electric Vehicle Discussion List <[email protected]>
Sent: Wednesday, September 27, 2017 10:39
AM
Subject: Re: [EVDL] Solar vehicles..just
do the math.
I think
you can get 15W/sqft and my Volt is not very efficient I
often
need 16KW if I take it easy but even
at 8kw you would need 533sq feet
of solar
panels 23ft by 23ft. So... not a great deal but with a
32KWh
battery pack you could charge it with
a 23x23 panel on your roof in 4
hours.
That sounds like a better deal and very manageable.
sean
On Wed, Sep 27, 2017 at 1:05
PM, Lawrence Rhodes via EV
<[email protected]>
wrote:
> It seems people are
underestimating the capacity of solar panels on vehicles.
It is a simple math problem. Encapsulation is also a
challenge. However I don't have the math to calculate
how fast a 3.3kw solar system would push a 3000 pound
vehicle. It seems you would need 8kw to push a Leaf up to
45mph. This is just a guess but it seems to me that a
simple calculation of weight, CD, array size would be all
you would need to calculate the usefulness of any solar
vehicle. Stella Lux is capable of 45mph with a 1.5kw solar
panel, a weight of 850 pounds(it can carry 4 people) and a
CD of .16. If you have a 22 ft x 8' vehicle like an
aluminum Ultravan at 3,000 pounds (which is less than a
Leaf) you would have good range but calculating how much
solar would fit, the CD which I think is under .3 and the
speed possible with the max panels is beyond me. I do know
that if you had a 3.3kw array you would be able to charge a
24kw pack in 10 hours making a useful vehicle. It might be
able to do 20mph on solar. I bet Dave Cloud could figure
it out. The Dolphin is a very cleaver vehicle. I wish I
had some land to work on an Ultravan. Lawrence Rhodes
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--
Sean Korb
[email protected]
http://www.spkorb.org
'65 Suprang,'68 Cougar,'78
R100/7,'60 Metro,'59 A35,'71 Pantera #1382
"The more you drive, the less intelligent
you get" --Miller
"Computers are
useless. They can only give you answers." -P.
Picasso
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