Most of California has almost all days sun, but he lives in SF, so clouds (the famous fog) is more an issue
but inside the city the shade from buildings and trees is certainly a factor *and* the fact that you do not only want to drive while the sun is overhead. There is a case for cars that get used very little (infrequent or very short drives) and can be parked in full sun (like on a parking deck top floor, no trees or other buildings) so you can gain charge over time, about 5 hours (full sun equivalent hours that is) per day, for an optimal-max of 5 kWh harvested each day. So, if you have a Leaf and drive it 1 or 2 times per week, such an arrangement can work. Anything that is a daily driver for more than what you could walk or bike and which gets parked in whatever spot available (be picky and you can’t park at all in SF) and in real-life environment and you won’t be able to use it 4 out of 5 times, I am afraid, so unless you normally always plug it (again – a difficult proposition with mostly curb-side parking in SF) there is not much utility from an EV there… Cor van de Water Chief Scientist Proxim Wireless office +1 408 383 7626 Skype: cor_van_de_water XoIP +31 87 784 1130 private: cvandewater.info <http://www.cvandewater.info> www.proxim.com <http://www.proxim.com/> This email message (including any attachments) contains confidential and proprietary information of Proxim Wireless Corporation. If you received this message in error, please delete it and notify the sender. Any unauthorized use, disclosure, distribution, or copying of any part of this message is prohibited. From: Michael Ross [mailto:michael.e.r...@gmail.com] Sent: Monday, March 30, 2015 12:41 PM To: Ben Goren; Electric Vehicle Discussion List Cc: Cor van de Water Subject: Re: [EVDL] Making solar work in a conventional vehicle. We were talking about this a week or two ago. Lawrence will be plugging in, but he is optimistic that this can be minimized. I think he is in the Bay area though, so clouds may be an issue. On Mon, Mar 30, 2015 at 3:29 PM, Ben Goren via EV <ev@lists.evdl.org> wrote: On Mar 30, 2015, at 12:19 PM, Cor van de Water via EV <ev@lists.evdl.org> wrote: > It is simple: measure the surface area of the car and multiply by the > expected PV efficiency, > then you know why a Solar Racer needs full sun overhead most of the day *and* > be an extreme car > to achieve any speed or range. ...and it's worse than even that. The angle from the Sun to the panels matters a great deal. A panel at right angles to the incoming light receives the maximum amount of energy; a panel parallel to the light receives zero energy. You don't have much choice about the angles the panels of a car make with the light. Fixed panels, on the other hand, can either be statically positioned for an optimum annual average production or, if money isn't an object and space is at a premium, you can dynamically tilt the panels to follow the Sun. For the car...well, ideal geometry for the panels is going to be a flat top parallel to the ground, but that's a geometry bordering on the pathological for aerodynamics. b& _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA) -- To invent, you need a good imagination and a pile of junk. Thomas A. Edison <http://www.brainyquote.com/quotes/quotes/t/thomasaed125362.html> A public-opinion poll is no substitute for thought. Warren Buffet Michael E. Ross (919) 585-6737 Land (919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Google Phone (919) 631-1451 Cell michael.e.r...@gmail.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20150330/7539671f/attachment.htm> -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: image/png Size: 10048 bytes Desc: image001.png URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20150330/7539671f/attachment.png> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
