RV Electricity – Just Ask Mike (J.A.M.): Powering fridge in RV 40 ft. from house outlet


By Mike Sokol

Welcome to my J.A.M. (Just Ask Mike) Session, a weekly column where I answer your basic electrical questions. If you’re a newbie who’s never plugged in a shore power cord (or ask – what’s a shore power cord?), or wonder why your daughter’s hair dryer keeps tripping the circuit breaker, this column is for you. Send your questions to Mike Sokol at mike (at) noshockzone.org with the subject line – JAM.

Dear Mike,

What’s the best way to run a power cord to my 50-amp RV out in the driveway that’s 40 feet from my house outlet? The only thing I want to run is the refrigerator, and I really don’t want to drag out my 25-ft., 50-amp shore power cord, plus an extension cord. What would you do? —Jim

Dear Jim,

Here’s how I would do it. Since you can easily get by on 10 amps or so, I would get a nice 12-gauge/50-ft. extension cord rated for 20 amps of current. Yes, you could probably use a lighter/cheaper cord, but to minimize voltage drop I would stick with a 12-gauge cord.

Next, I would get a 15/50-amp dogbone adapter that plugs right in the side of your RV’s shore power inlet. I like the ones with the short whip hanging straight down and the right-angle head. This eliminates any torque moment that would twist a side-mounted plug out of the extension cord socket.

Then plug this into a dedicated GFCI-protected outlet mounted on the side of your house fed by a 20-amp circuit breaker. If you do get a random GFCI trip, then turn off all the circuit breakers in your RV power panel except for the one powering the refrigerator.

There you go, all done. Please let us know how this works. —Mike


OK, everyone. Remember that electricity is a useful and powerful force, so we all need to pay attention to safety precautions while using it.

Let’s play safe out there….



Mike Sokol is an electrical and professional sound expert with 40+ years in the industry. His excellent book RV Electrical Safety is available at Amazon.com. For more info on Mike’s qualifications as an electrical expert, click here.


Leave a Comment

This site uses Akismet to reduce spam. Learn how your comment data is processed.

newest oldest most voted
Notify of
Ron Seidl

Good answer Mike,
I just measured the load of the 120 volt heater on my good size Dometic RV absorption refrigerator. It draws about 2.7 amps (325 watts). So a 15 amp circuit will easily power that with some left over for the convertor/charger

Dave Telenko

Wondering about that 20 amp plug! Would that also start the battery charger going when you plug in. I know when I plug in to my 50 amp, my house battery is being charged, sometimes in bulk. I have my bulk set at 70% & I see 80 amp charging. Dont really know how many amps the charger is actually drawing though.


My refridge has a 110 plug and outlet in the back inside the refridgerator area, just pull off the access panel and unplug the ref from the trailer and plug in the cord, The cover obviously wont go back on tight but i’m sure you can sucure it easy enough.

Bob Godfrey

Mike I hate to be picky but isn’t that a picture of a household 50amp adapter? Sure doesn’t look like my 50amp RV power cord end.


Also, the reverse works. Run a power cord from motorhome genset to house frig, when you lose house power for extended time.
Thinking of Dorian right now.