Leaf power level demands at 55 mph are easily 4 mi/kWh or 250 Wh/mi (or 13.75 
kWh/55 miles at 55 mph).

It would be awesome if Leaf energy consumption was as low as you mentioned but 
most owner experiences indicate otherwise. With your numbers a Leaf could 
easily do 150 miles. Many owners get 40-60 miles in older Leafs and 80-100 
miles in newer 30 kWh models.

2011-2017 Leaf motor is rated at 80 kW power.

On December 28, 2017 11:31:41 PM CST, ROBERT via EV <ev@lists.evdl.org> wrote:
>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 <ev-boun...@lists.evdl.org> on behalf of Marc de Piolenc via
>EV <ev@lists.evdl.org>
>Sent: Thursday, December 28, 2017 9:39 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
>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,
>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
>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.
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