It is pretty easy to do the math here, simple arithmetic. The sun shines maybe 1100W/meter ^2, that is the peak. Current efficiency of solar PV is no more than 20%. So 220W/m^2. One square meter will get you 1kWhour in a little less than 5 hours. You might get 6 peak hours on a really sunny day, but this varies up a little and definitely down. Clouds are hell. Parking in the shade is hell, driving around is hell.
Seems to me you are not going to get anything but the tiniest fraction of what is needed to move a store bought EV around with onboard PV. On Sun, Jul 17, 2022 at 7:41 PM EV List Lackey via EV <ev@lists.evdl.org> wrote: > On 17 Jul 2022 at 13:15, Mr. Sharkey via EV wrote: > > > The point being, not every idea makes sense from the standpoint of > > practicality and consumer acceptance > > As I see it, and admittedly I'm not an expert, for solar EVs with onboard > PV > to be really practical - for widespread adoption rather than as showoff > rich > boy toys - a few little tweaks need to happen. > > - PV conversion efficiency has to improve radically > - PV cost has to decline radically > - PV durability has to increase radically > > Impossible? Of course not, but when? It took about 25 years for EV > lithium > batteries to get from notion to production EVs. > > Also, don't forget the environmental changes needed to keep the sun > shining > on solar EVs. > > - Remove trees and buildings blocking sunlight from roads and parking > - Tear down garages and carports (or use them for other things) > - Disperse clouds and banish rain > - Ideally, eliminate night and winter :-\ > > No matter how good PV tech gets, it will ALWAYS make more sense to put > your > PV on your house and/or garage, save the output in a battery or the grid, > and charge your EV with that energy at night. > > But the solar-car true believers just won't wake up from the dream of a > car > that runs on pure rays, that you never have to plug in. (Where have I > heard > that before?) > > And maybe that's OK. Knowledge beats belief, but if everybody listened to > the experts who say it can't be done, nothing would ever change. If > Martin > Eberhard and Marc Tarpenning had listened to all the "experts" who said > that > road EVs weren't practical, they never would have started Tesla. We'd > probably still have EVs by now, but probably not as many, and probably not > as capable, and probably not legally recognized as future transport in the > EU. > > David Roden, EVDL moderator & general lackey > > To reach me, don't reply to this message; I won't get it. Use my > offlist address here : http://evdl.org/help/index.html#supt > > = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = > Blockchain is an elaborate workaround for a very specific problem: > verifying irreversible transfers of value without a centralized > authority. In other words, it's a computationally burdensome way to > hate the government. > > -- Sarah Jeong > > = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = > > _______________________________________________ > Address messages to ev@lists.evdl.org > No other addresses in TO and CC fields > HELP: http://www.evdl.org/help/ > > -- Michael E. Ross (919) 585-6737 Land (919) 901-2805 Cell and Text (919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Tablet, Google Phone and Text -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20220717/aece684e/attachment.html> _______________________________________________ Address messages to ev@lists.evdl.org No other addresses in TO and CC fields HELP: http://www.evdl.org/help/
