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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