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Old 03-29-2016, 02:18 PM   #1
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Join Date: Dec 2015
Location: NE Florida
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Hughes RV220-50 Autoformer

There's been a few discussion on the merit of these thing so I figured I would chime in. We used one of these for 30 amps on our old coach and it seemed to help when we were at older parks when it was hot and everyone was running all the air they could.
I just got the 50 amp model for the Bounder because we're headed to several parks that only have 30 amp power. We've been there in the winter so it wasn't an issue since nobody was running their air.
Hughes says it's OK to use the 50 amp model with the normal 30A to 50A adapter we have to use at those parks.
I just checked my circuit at the house with the digital meter they included and found that without the unit in line I read 121 VAC at one of the receptacles.
It's interesting to note that when I add the autoformer to the system the same receptacle reads 123 VAC but neither of the red lights are on indicating boosted power.
I hope it helps a bit when we're in a 30 amp park during the heat of the summer.
I'll try to let ya know when we get back.

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Old 03-29-2016, 02:55 PM   #2
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We were staying an older RV park up in the UP of Michigan. It had lots of problems including low voltage. As soon as it got hot enough for people to run their AC's we were seeing very low voltage, sometimes down to ~105. To solve the problem I bought a Hughes Autoformer, it worked as advertised and we never had a problem. I carry it an use it if we are in part with lower voltage.

Jim J
2002 Monaco Windsor 38 PKD
2005 Jeep Grand Cherokee w/5.7 Hemi
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Old 03-29-2016, 03:01 PM   #3
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From their website:

How Does it Work?

At first we are tempted to say very ‘well’. But this may not be the answer you are looking for!
Autoformers are used in industries to stabilize voltage and lower the operating cost of equipment. The Autoformer has 5 windings: 2 primary and 3 secondary. All models have surge and spike protection. When the unit is in Automatic and the park or input voltage is 116 volts or below, the output is 10% over the input. When the input is over 118 volts, the output is 2% over the input.
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Old 03-30-2016, 10:42 AM   #4
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Location: Over the next hill, around the next curve...
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Have been pleased with our Hughes. It's one of those things that you really don't know how much it can help you, until you need it!

Our first time was in an older park in Montana. I was outside and two other campers walked over and asked me how we were keeping out AC units running. They say they could not, that the parks power was too variable with frequent dips of lower voltage.

I told them we had an Hughes Autoformer permanently inline, and had not even noted the lower power. As a test, I bypassed the Hughes, and sure enough, we could watch our lights dim frequently over a 10-15 minute period.

We lost our first Hughes on our trip to Alaska, as a park running of generator had someone mess up on what was sent out. The park was not yet opened, it was so early in the season, but we pulled in and asked if we could dry camp for the night. (In Yukon, right next to a river.) The park manager was getting things ready to open next week, so he said sure. (Pretty sure he pocketed the $10 we offered to pay for the nights say.) He came by later, and said he had the generator fired up, and said to go ahead and hook up. About an hour later, we heard a loud POP, loss all coach power, and started to smell burnt electrical. Unplugged, made sure no fires were active, then dug back into the cabinets where the EMS and Hughes were kept. We had the Hughes first in line. Bypassed the Hughes, reset some breakers. And all but he fridge came back online. Next day we backtracked to the previous larger down of St John's. A tech was able to get slot us in early to just do a diagnostic on the Norcold. Figured we might need a new control board for it, and wanted to get it ordered ASAP if it was bad. He looked things over, and said lets try a forced reset, jumped some circuits on the board, and all of us were pleased to see the Control Board come back to life. It had seen just enough of a spike, to try and shut down to save itself. Good for us, as it would have been 3 days to get a replacement in to swap out!

We smelled burning melted wires for about three weeks. (Did not tear apart the cabinets to get the old Hughes out while on the road.).

We have a replacement Hughes now. On our dime, as when I talked to the owners of the park, who were remote, they said that they were not responsible for the damage. That the Park Manager was not authorized to open the park that early. Even asked me if I had any receipt to prove we are in the park, which I did not... Sparred with them off and on for about a month as we were traveling, then just moved on!

I like the Hughes!

Best to all,
Roo II is our 04 Country Coach Allure 40'
OnDRoad for The JRNY! Enjoy life...
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