What? To maintain a small car like a Leaf at 55 MPH only requires about 10 - 12 HP. This is only 7.5 KW (10HP) - 8.9 KW (12HP). The battery in the Leaf is rated at 30 KW-Hr. At 55 MPH it does not require all the power in the battery (30KW-Hr). It only requires 7.5KW-Hr - 8.9 KW-Hr to maintain 55 MPH. A solar panel system that could replenish this energy plus conversion losses would keep the car going and the battery level at a its current level of charge because the solar panel system would run the car.
________________________________ From: EV <[email protected]> on behalf of Marc de Piolenc via EV <[email protected]> Sent: Thursday, December 28, 2017 9:39 PM To: [email protected] Cc: Marc de Piolenc Subject: Re: [EVDL] Solar trailer You're getting power and energy mixed up. Your Leaf has a POWER rating of 30 kW, which means that (at full power) it consumes 30 kW-hours of energy per hour. It does not get 4.5 miles per kW because a kilowatt is a unit of power, not energy - maybe 4.5 miles per kWh which is roughly consonant with its power rating and speed. To support that speed without dipping into batteries, you need a solar array that constantly produces 30 kW, which at 20% efficiency, receiving 100 watts per square meter, will require 300/.20 square meters of solar photovoltaic panels, or 1500 square meters. Not easy to tote around. It is safe to say that you cannot generate enough juice to recharge while driving. On the other hand, having a much smaller array can still allow your car to recharge while it is parked in the open, and that might be worthwhile, depending on your application. This would work if you have a short commute, followed by the car being idle for nine hours or so in broad daylight in a sunny climate. Marc de Piolenc On 12/28/2017 11:52 PM, [email protected] wrote: > My math is good enough to figure out I get about my 30kw Leaf gets 4.5 miles > per kw at 55mph more or less depending on wind.? What I'd like to know is > what size solar panel would be needed to support that speed.? Now don't tell > me it can't be done.? I just want to know the formula for figuring it out.? > My puny brain exploded when I thought of all the variables.? I do know that a > 3000 watt system would charge my car in 10 hours.? I would just like to know > the numbers of what would be needed for continuous power at speed.? I > guesstimated it would be about 10000 watts.? I'd just like the exact number.? > Thanks,? Lawrence Rhodes...the point is to build a teardrop solar range > extender/RV that could charge while driving. -- Archivale catalog: http://www.archivale.com/catalog [http://www.archivale.com/catalog/images/header.gif]<http://www.archivale.com/catalog> Archivale<http://www.archivale.com/catalog> www.archivale.com Archivale is your Internet Gateway to Technical Information. Search, or browse our site by topic to find the information you need, at a price you can afford. Polymath weblog: http://www.archivale.com/weblog Translations (ProZ profile): http://www.proz.com/profile/639380 Piolenc - French to English translator. Translation services in Automotive / Cars & Trucks - aeronautics, propulsion, lighter than air, power, intelligence, espionage, military, engineering, nuclear, chemical, mechanical, civil<http://www.proz.com/profile/639380> www.proz.com (Translator Profile - Piolenc) Translation services in French to English (Automotive / Cars & Trucks and other fields.) Translations (BeWords profile): http://www.bewords.com/Marc-dePiolenc Ducted fans: http://massflow.archivale.com/ [http://massflow.archivale.com/jh2_2.gif]<http://massflow.archivale.com/> Mass Flow<http://massflow.archivale.com/> massflow.archivale.com Other Ducted Fan and Shrouded Propeller Links [No endorsement by Mass Flow is implied!] Smitty Hairplane Company (a "baby jet" with auto-engine-driven fan) _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub [http://www.evdl.org/images/evdl.jpg]<http://www.evdl.org/help/index.html#usub> EVDL Subscription Information and Help<http://www.evdl.org/help/index.html#usub> www.evdl.org About the EVDL: The Electric Vehicle Discussion List, founded in 1991 by EV enthusiast Clyde Visser, is an active and vital source of information and help for people ... http://lists.evdl.org/listinfo.cgi/ev-evdl.org EV -- Electric Vehicle Discussion List - lists.evdl.org ...<http://lists.evdl.org/listinfo.cgi/ev-evdl.org> lists.evdl.org The Electric Vehicle Discussion List is a forum for discussing the current state of the art and future direction of electric vehicles (EVs). We define an EV as a ... Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) [https://s1.yimg.com/dh/ap/default/130909/y_200_a.png]<http://groups.yahoo.com/group/NEDRA> Yahoo! Groups<http://groups.yahoo.com/group/NEDRA> groups.yahoo.com / -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20171229/085d2569/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)
