The Dutch used 5 thousand dollars of Sunpower 24.1% efficient cells. Off the 
shelf parts.  Nothing exotic. When making a car and this is your power it is 
cheap. Think how long 5 thousand dollars would  run a gas car.  So you have to 
have the most efficient cells and a better body.  New thinking.  I'm not saying 
give up your EVSE at home just yet but why not have solar on top of something 
that is sitting 22 hours a day.  That said you will have to build a body that 
is capable of being pushed by solar.  Quite a task. But possible.   Lawrence 
Rhodes

      From: Robert Bruninga <bruni...@usna.edu>
 To: Lawrence Rhodes <primobass...@sbcglobal.net>; Electric Vehicle Discussion 
List <ev@lists.evdl.org>; spk...@gmail.com 
 Sent: Wednesday, September 27, 2017 3:10 PM
 Subject: RE: [EVDL] Solar vehicles..just do the math.
   
But anyone who does not have a good place to park and charge at home
overnight is simply not a good candidate for an EV.  Trying to fix that with
solar panels on the roof of the EV is a very expensive way to go.  Bob

-----Original Message-----
From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of Lawrence Rhodes via
EV
Sent: Wednesday, September 27, 2017 5:53 PM
To: spk...@gmail.com; Electric Vehicle Discussion List
Cc: Lawrence Rhodes
Subject: Re: [EVDL] Solar vehicles..just do the math.

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 <spk...@gmail.com>
 To: Lawrence Rhodes <primobass...@sbcglobal.net>; Electric Vehicle
Discussion List <ev@lists.evdl.org>
 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 <ev@lists.evdl.org>
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 spk...@spkorb.org 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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