Marc, Iam afraid you are not making the Leaf specification situation better. When Lawrence says he has a 30kW battery, he means 30 kWh. That is a 2016 Leaf with the improved battery (normal was 24 kWh). All Leafs have a 90 kW rating IIRC, meaning that they can accelerate with the motor producing up to 90kW of power. Standard freeway driving takes about 15kW, Lawrence is apparently capable of using only 12.2 kW while mainining 55 MPH on the freeway by doing 4.5 mi/kWh. Regards,
-----Original Message----- From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of Marc de Piolenc via EV Sent: Thursday, December 28, 2017 8:40 PM To: ev@lists.evdl.org 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, ev-requ...@lists.evdl.org 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 Polymath weblog: http://www.archivale.com/weblog Translations (ProZ profile): http://www.proz.com/profile/639380 Translations (BeWords profile): http://www.bewords.com/Marc-dePiolenc Ducted fans: http://massflow.archivale.com/ _______________________________________________ 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) _______________________________________________ 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)
