Need to run electric for a camper about 650 feet from my 200 amp service pole at the farm. I need 50 amps for the camper ac and such but I am worried about voltage drop. I am going to run the wire in pvc conduit due to the rocky soil. I can't find any reference to the distance of run relative to the wire size to use. Any help would be great. I really don't want to run a generator.

Try using this calculator.Voltage Drop Calculator (http://www.csgnetwork.com/voltagedropcalc.html) What voltage is required for the ac?

You probably should step up and then back down again for that distance.

Thanks for the site, perfect.
110 volt ac with 13 amp startup 10amp run.

I don't know about stepup/stepdown. How about more info?
Thanks

X49, is the ac the only thing you plan to run?

My plan is to set one or two travel trailers on site for camping. We have a 30' with one ac now. This one has a 30 amp plug. We will use the site about 10 weekends per year.
Perhaps in the future I will set another trailer for up and coming grand kids.
We may set a light to light the area when needed, not full time.
Thanks

This is really a hard call, but I do believe an electrician should be consulted. I also do believe that 650' is WAY too much for a 3% voltage drop at 120V and the wire cost would be way too expensive.

A transformer is nearly 100% efficient in converting voltages. Power remains constant. Thus at 1200 V, the current is 1/10 of what's required at 120V. The power company does this all the time.

It also creates an isolated source and therefore I believe, you don't have to carry the ground or neutral conductors. You'll create them at the other side.

So, say for instance you use a 240 V to 1200V transformer at the source end and a 1200 V to 240 CT transformer at the other end. The CT becomes ground and your neutral for the other location and your wire size goes down considerably.

There are better calculators at electrican2.com (http://www.electrician2.com), but probably won't handle this.

High voltage it not something you really want to mess with, but you can arrange what you will do with your contractor. e.g. mount boxes, pull cable and bury conduit. He pulls permits ans makes the final connections.

650 feet to too long to deliver 120/240 volts.

Contact an electrician to resolve this, as two transformers of the proper size and voltages are needed for a step-up and step-down installation.