Well the the ratio of panel size to output power for the vehicle does vary upon speed and usage. As a builder of a an on-board solar powered boat I have had great success with it - 4 years worth :-) My Firefly's motors ( http://www.evalbum.com/3432) are only about 800 watts total power from my crude homemade panel is 140 watts. This gives me roughly a 4.:1 ratio of charge to drive during daylight i.e. it take 4 hours of sunlight to allow travel for 1 hour. While that only means 3-4 miles of travel, it's more than enough to travel to the end of the lake and back. The boat was purpose built to fish, cruise and dive off on a small lake so big power or speed wasn't considered but it is still practical. Obviously more speed requires more power and the panel size and weight becomes an issue. I have a larger faster electric boat I plan to convert to solar some day ( http://www.evalbum.com/4767) but I expect the charge ratio to be 30:1 if the boat could maintain full throttle for 1 hour, but likely closer to 10:1 for normal cruising speeds.
Dan Baker http://www.evalbum.com/3432 http://www.evalbum.com/4767 http://www.evalbum.com/4544 http://www.evalbum.com/4451 On Thu, Feb 12, 2015 at 5:54 PM, Michael Ross via EV <ev@lists.evdl.org> wrote: > Lawrence, > > For practicalities sake, I think 77ft^2 (7m^2) is a hard sell for getting > much travel done. Just roughing it out, (and a person can take some > exception with any of these) a meter squared is good for maybe 1000W of > incoming sun. For maybe 8 hours a sunny day and less over a year - call it > 6 hours (it was far less than that here in NC this summer). You can get > more than 20% efficiency from the panels if they are mounted correctly on a > roof. On a car I think you need to cut that in half or more. > > So that 6kWh (10%) = 600Watt Hours. On a daily basis for a pretty big car > compared to what I use with no panels. > > My daily commute in a pedal assist EV uses about 2kWh. For a round trip of > 50 miles. > > It just would not do for me. My home mounted 5.6KW system is helping much > more. > > Mike > > > > > On Thu, Feb 12, 2015 at 4:00 PM, Lawrence Rhodes via EV <ev@lists.evdl.org > > > wrote: > > > Not going to happen. The 11 x 7 patch on the roof of the solar vehicle > > stays. I'm not accepting any it can't be done statements....next. > > Lawrence Rhodes...I don't care how ugly. I'm making a copy of Stella. > > -------------- next part -------------- > > An HTML attachment was scrubbed... > > URL: < > > > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20150212/09874b6c/attachment.htm > > > > > _______________________________________________ > > 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) 550-2430 Land > (919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Google > Phone > (919) 631-1451 Cell > (919) 513-0418 Desk > > michael.e.r...@gmail.com > <michael.e.r...@gmail.com> > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20150212/ac0a98c7/attachment.htm > > > _______________________________________________ > 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) > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20150212/9717ac44/attachment.htm> _______________________________________________ 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)
