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.

-----Original Message-----
From: EV [] On Behalf Of Marc de Piolenc
via EV
Sent: Thursday, December 28, 2017 8:40 PM
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, 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: Polymath weblog: Translations (ProZ profile):
Translations (BeWords profile):
Ducted fans:
Please discuss EV drag racing at NEDRA

Please discuss EV drag racing at NEDRA (

Reply via email to