# Re: [EVDL] Solar trailer calculation

```A solar trailer with a conventional EV is not well suited to sustained highway
speed transport. It can however be useful for range extension (if you can
charge while driving or use the trailer as a pusher) or for slow charging while
camping at non-electric camp sites. Getting 1 kW on a trailer is definitely
possible, and that in turn can get you about 3-4 kWh per day depending on solar
orientation and day length. 3-4 kWh is 12-16 miles/day for a 250 Wh/mile EV.
For someone camping in a particular place for several days at a time, this
could work out alright.```
```

On December 28, 2017 1:21:41 PM CST, EVDL Administrator via EV
<ev@lists.evdl.org> wrote:
>On 28 Dec 2017 at 5:05, ROBERT via EV wrote:
>
>> I do not know who does your math.  The email states "Leaf gets 4.5
>miles per
>> kw at 55mph more or less depending on wind."  Therefore, 1000 W / 4.5
>miles =
>> 222 W per mile.   This appears to be a little low to me.  However, if
>it is
>> accurate, you would need 222 W to go one mile.
>
>First of alll, that should be kilowatt hours (KWH) and watt-hours, not
>just
>watts.  Watts per mile is a meaningless unit.  Saying your EV uses 222
>watts
>per mile is like saying your ICEV uses 120 horsepower per mile.
>
>Second, I don't see anything wrong with the math in the message you're
>replying to.  My only quibble would be with "you would need a minimum
>input
>of 12,220 watts."  I would say that he needs a minimum AVERAGE input of
>
>
>Others have posted the amount of square PV area needed, so I won't
>rehash
>that.  I'll just remind you that the sun doesn't shine 24 hours a day,
>and
>that insolation is lower on cloudy days and in the winter.  Even if you
>can
>design a trailer to keep your EV going 55 at noon on a clear summer
>day,
>what will you do at other times?
>
>Putting PVs on a vehicle (or its trailer)  probably isn't the most
>efficient
>use of your PV dollars.  Is it really worth it?  Your call.
>
>David Roden - Akron, Ohio, USA
>
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