On second and third thoughts now:
Is this going to be a permanent installtion? If so I would
consider going "pro" on this...go to a "real" rv
distribution setup and do #8 or #6 wire and run 220
with a reall beefy xformer....like many KVA for your RV
sitting out there 700 feet.
I know it's dummy stuff..but can you consider to
move the rv closer to the
power and put a tent out there 700 feet for the kids I
assume? LOL...
The IR drop is going to cause havoc with NEC...and that stuff
is serious..you could get red-tagged and a lot of issues..
unless you are really in the boonies like I am near
Yosemite...I run 2 #10's to my rv (copper) and the wire
gets warm for the AC and that is only 250 feet...
--- In DoIt_Yourself@yahoogroups.com, "rjcalliger" <rjcalliger@...> wrote:
>
>
>
>
> hmmm...you did not say wire size....but this is going to be
> real iff even with a BB because if you use #10, for example,
> AL wire has a resistance of .00164 ohm/ft = 1.148 ohms
> for 700 feet...now e = ir as you know = 40amps x 1.148 ohms
> = a 45 volt drop @ 40 amps max load...
>
> I have never seen a BB work more than 15-20 volts at that
> load...but not saying I seen everything...
>
> I would seriously consider a (quiet) honda 3000 generator
> and forget the 700 feet....brown outs can kill somegear
> as you know...
>
> I am an electrical engineer but have been known to blow a
> few fuses (and calculations)..so check me on this please...
> #8 wire is pricey but I would go to at least that..and still
> need a BB..
>
> Or..go to the 220 volt option...and step it down...
> Or --got to a combination..run the 700 feet for general
> use and keep a 2KW generator there for the AC...20amps
> runs my 15KBTU rv ac just fine as long as the fan is
> started first then cool switched on real fast from fanmode.
>
> Rich
>
>
>
> --- In DoIt_Yourself@yahoogroups.com, "wired" <wiredformen@> wrote:
> >
> > I apologize that this is a bit technical of a question, but I know a few people here are technical kind of guys.
> > I am going to run an electric line for a motor home, with aluminum wire, a distance of 700 feet. The motor home needs 40 amps 120 volts.
> > Voltage drop is a major issue here. My thought is to use a transformer to either run 240 volts there and step it down to 120 volts . Option 2 is use a buck boost transformer to raise the 120v. voltage a few volts at the end of the line. What about a transformer with a regulator to keep the voltage even in varying loads conditions? Please don't worry about my using aluminum wire as I know how to properly connect it (I am an electrician). This is to be used only occasionally for recreation purposes at a pond (city slickers camping out in town).
> >
>
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