# Re: [EVDL] Solar trailer calculation

```> With more efficient panels that length is reduced to 60 ish feet.

But the cost to double efficiency from 18% to 36% costs ONE THOUSAND times
more.
and ALWAYS WILL.  Since 1970, in the same time since Silcon cells have gone
down in cost by 100 to one, the cost of higher efficiency cells has only
gone UP by ten to one.```
```
The difference is now 1000 to one. and DIVERGING not getting closer.  THe
raeson is that the space industry will pay ANYTHING for a few more watts.
The home owner wont pay a dime more..

bob, WB4APR

On Fri, Dec 29, 2017 at 10:37 AM, Lawrence Rhodes via EV <ev@lists.evdl.org>
wrote:

> With more efficient panels that length is reduced to 60 ish feet.
> Lawrence Rhodes
>
>       From: Brett Davis <maverick...@gmail.com>
>  To: Lawrence Rhodes <primobass...@sbcglobal.net>; Electric Vehicle
> Discussion List <ev@lists.evdl.org>
>  Sent: Wednesday, December 27, 2017 3:10 PM
>  Subject: Re: [EVDL] Solar trailer calculation
>
> The consumption rate is 12.2 kWh plus losses.
> So a 15kW panel should do it? (Is this right? )
> Some quick googling suggests 100-110 square meters. 1100 sq ft or so.  8'
> wide and 130' long.
> YMMV
> Brett
> On Dec 27, 2017 3:48 PM, "Lawrence Rhodes via EV" <ev@lists.evdl.org>
> wrote:
>
> Hi all,
> 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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