In my analysis of the Stella vehicles, I assume that the 1.5 kW PV array delivers the overall performance of a 0.9 kW array (60%) mounted on the roof of a house. But the most important aspects of the Stella vehicles are their low weight (830 lbs.) and extremely low CD (0.16?). They claim 400 miles with a 15.2 kWh battery, which works out to 26+ miles/kWh. When I assume a more modest value of 20 miles/kWh, since the average American family has two cars that are driven a combined 20,000 mile/year (consuming about 28,000 kWh/year), the Stella Lux would consume 1000 kWh/year, 28 times less. But if you base the energy on the embedded energy of the 1.5 kW solar PV array (averaged over 30 years), even in the Seattle area which has the worst solar energy in the continental U.S., it works out to about 370 kWh/year, or about 70 times more efficient than a gas engine car.
But if you remove the solar PV from the car and put it on the roof of your house, we get an efficiency of 100 times better than current gas cars: that is, we use only 1% of our current energy use. On Sun, Dec 9, 2018 at 5:08 AM EVDL Administrator via EV <ev@lists.evdl.org> wrote: > On 9 Dec 2018 at 3:30, paul dove via EV wrote: > > > (Eight hours of charging TeslaTMs Model 3 from a wall socket will give > > you your expected 200-plus miles of range.) Someone's math is off. You > > can only get 1KW/h from a wall socket. Maybe 30 miles in 8 hours. > > > > This statement isn't quite accurate. > > First, there's no such unit as "KW/h." That has to be a typo. It's like > saying "horsepower per minute." > > KWh doesn't work, either. The unit you're looking for is kW -- kilowatts. > > Second, it all depends on what kind of "wall socket" it is. Behind my > range > on the wall is a receptacle that will deliver 9.6kW (at the NEC required > 80% > demand factor) for as long as you wish. Allowing for 90% charging > efficiency, that would charge a Tesla 50kWh battery to 80% SOC in 5 hours > and 48 minutes. > > Third, you're a little low even for a regular 20 amp branch-circuit > receptacle. As long as it's a 20 amp rated receptacle, it can deliver up > to > 80% of the circuit's rated capacity -- 1.92kW -- for an indefinite > period. > Even a 15 amp receptacle can give you up to 1.44kW continuously. > > David Roden - Akron, Ohio, USA > EVDL Administrator > > = = = = = = = = = = = = = = = = = = = = = = = = = = = = = > EVDL Information: http://www.evdl.org/help/ > = = = = = = = = = = = = = = = = = = = = = = = = = = = = = > Note: mail sent to "evpost" and "etpost" addresses will not > reach me. To send a private message, please obtain my > email address from the webpage http://www.evdl.org/help/ . > = = = = = = = = = = = = = = = = = = = = = = = = = = = = = > > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Please discuss EV drag racing at NEDRA ( > http://groups.yahoo.com/group/NEDRA) > > -- Larry Gales -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20181209/d680ff18/attachment.html> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
