It hardly makes a difference how efficient the elements can be as the sun only makes just so much power on a given surface, it a given time of day and a given angle of persentation of the element.
If your elements were 100% efficient and rotated 60 degrees away from direct you would only get 50% of the incident energy. This is pertinent because the auto is turning relative to the sun throughout any trip. That incident energy is extremely variable from 0W/metter^2 at night to perhaps as much 1300W/m^2 on the very best low humidity, cloudless day. You can decide how to derate that capability for the real world many ways. You might get good power from bright sun oever 8 of 24 hours. You can't park in the shade of tree, building or parking deck. Finally a car that is maneuverable, will be small making for a difficult optimization between soar capability and real world function. A Smart for Two would make almost no power becaus the square area would be so small. But we all here, probably know this stuff already. It is a silly idea. Get the sun at home from PV, put it in batteries, or whatever new thing comes along and let the PV continue doing what it can in a stationary installation. Settle for making the car an efficient consumer of the power. On Mon, Sep 21, 2015 at 12:22 AM, Cor van de Water via EV <[email protected] > wrote: > Unfortunately the only useful bit of information is missing: > how much efficiency is expected in future with this technology? > At this moment the efficiency of just over 12% is underwhelming, > because mass produced cheap silicon PV easily reaches 15% and > in labs there have been versions that go to the 30% range. > The issue with recharging on the car itself is the limited area > requires an order of magnitude better efficiency than existing > silicon PV to be practical as main energy source. > Which means that the efficiency must be well above 50% at > low mass-produced prices, in order to make on-car PV practical. > Since the article does not mention the expected limit of > efficiency or even the next steps, it does not help but to give > me a feeling that this is a "different but not better" alternative > to the same problem as silicon PV. I may be wrong. In fact, > I hope I am. > > 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 > 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. > > > -----Original Message----- > From: EV [mailto:[email protected]] On Behalf Of brucedp5 via EV > Sent: Sunday, September 20, 2015 12:35 AM > To: [email protected] > Subject: [EVDL] EVLN: Perovskite solar cells may power electric cars > > > > http://ecomento.com/2015/09/14/perovskite-solar-cells-may-power-electric-cars/ > Perovskite solar cells may power electric cars September 14, 2015 | > > [image / Bolloré BlueCar > > http://cdn.ecomento.com/wp-content/uploads/2015/09/Perovskite-solar-cells-electric-cars.jpg > (BlueCar EV) > ] > > The difference between perovskite and silicon when it comes to making > solar cells is that perovskite reacts to a broader range of visible light > frequencies, which means it converts more sunlight to electricity than > silicone does. > > Researchers at Case Western Reserve University have been experimenting > with the use of small perovskite solar cells to help recharge the batteries > of electric cars and say they have come up with a system that performs > better than any other. They wired four perovskite solar cells in series to > directly photo-charge lithium batteries with 7.8 percent efficiency. That > is the most efficient configuration reported to date. > > “We found the right match between the solar cell and battery. Others have > used polymer solar cells to charge lithium batteries, but not with this > efficiency,” said Liming Dai, the leader of the research team, adding that > the coupling appears to have outperformed all other reported pairings of > photo-charging components and compatible batteries or super-capacitors. > > Dai’s lab created cells with three layers converted into a single > perovskite film and then wired four of the 1 mm square cells in series, > achieving a solar-to-electric power conversion efficiency of 12.65 percent. > When hooked up to charge small coin-sized lithium-ion batteries, the team > achieved a conversion and storage efficiency of 7.8 percent and maintained > it over a number of cycles. > > “We envision, in the not too distant future, this is a system that you > could have at home to refuel your car and, eventually, because perovskite > solar cells can be made as a flexible film, they would be on the car > itself,” said contributing author Jiantie Xu. > > There are a number of new ideas for keeping the batteries of electric cars > charged. Goodyear is working on tires that recapture electricity while > driving and other companies are experimenting with shock absorbers that > turn road motion into electricity. Extending the range of electric cars is > critical to getting mainstream buyers to consider owning one. > > There are solar powered cars out there, but they all have large solar > panels mounted to the exterior. Probably the most appealing of them is the > Immortus sportscar from Australia, that tries to blend its solar panels in > with the body work. The beauty of the perovskite cells may be that they > allow recharging a battery without disrupting the styling of a car too much. > Further down the road will be photovoltaic paints that convert sunlight > directly to electric power for the cars of tomorrow. > [© ecomento.com] > ... > > http://www.gizmag.com/lithium-ion-car-battery-charge-perovskite-solar-cell/39157/ > Tiny solar cells could soon charge electric vehicles while on the road > Eric Mack August 28, 2015 [image > http://images.gizmag.com/gallery_lrg/perovskite-car.jpg > Perovskite solar cells, which are much smaller than traditional panels, > could soon revolutionize electric vehicle charging (Credit: Shutterstock) ] > ... > https://en.wikipedia.org/wiki/Perovskite_solar_cell > Perovskite solar cells > > > > > For EVLN posts use: > http://evdl.org/evln/ > > > http://siouxcityjournal.com/news/south-sioux-city-embraces-electric-cars-wind-solar-options/article_34f36197-8015-5691-a725-c30ce77c2233.html > L2 EVSE in S.Sioux_City-NE > http://www.plugshare.com/?location=16353 > > > http://mynewsla.com/government/2015/09/12/torrance-officials-mark-opening-of-6-electric-charging-stations/ > 6 NRG EVgo L2 EVSE @Torrance-CA > + > EVLN: gulfcoast.edu Students converted 1992 Miata ice-to-EV 4times > > > {brucedp.150m.com} > > -- > View this message in context: > http://electric-vehicle-discussion-list.413529.n4.nabble.com/EVLN-Perovskite-solar-cells-may-power-electric-cars-tp4677666.html > Sent from the Electric Vehicle Discussion List mailing list archive at > Nabble.com. > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Read EVAngel's EV News at http://evdl.org/evln/ > Please discuss EV drag racing at NEDRA ( > http://groups.yahoo.com/group/NEDRA) > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Read EVAngel's EV News at http://evdl.org/evln/ > Please discuss EV drag racing at 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) 600-2892 Cell [email protected] <[email protected]> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20150921/793a2a3e/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
