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Old 05-12-2013, 04:25 PM   #1
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50 amp autotransformer on 30 amp rv

I bought a Class C on a consignment from camping world and it came with a 50 amp autotransformer. My rv is 30 amps. I looked up the autotransformer from hughes and it's $500 so i figure i should use it. I looked all through the RV and i don't see a 50/30 dogbone so i'm not sure if the guy i bought it from used it or just stored it in the RV. My question is - Can i take my 50 amp hughes autotransformer, plug it into the 50 amp pedestal at the campground and connect it via a dogbone to my 30 amp RV without any damage? if so should i dogbone it to the 30 amp pedestal and do i need a surge protector as well?

Thanks for the help.
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Old 05-12-2013, 09:28 PM   #2
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I see no reason why it wouldn't work. The autoformer is regulating voltage on both 50A legs but your 30/50 dogbone is pulling power from only one of them. That's no problem at all.
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Old 05-13-2013, 06:23 AM   #3
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Electricity is my weak point. If i'm at a campground with both 30 and 50 amps at the pedestal should i do 50 amp to auto transformer to dogbone to RV or 30 amp dog bone auto transformer dogbone to RV? Is one way better than the other?
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Old 05-13-2013, 06:41 AM   #4
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Quote:
Originally Posted by MITCH8500 View Post
I bought a Class C on a consignment from camping world and it came with a 50 amp autotransformer. My rv is 30 amps. I looked up the autotransformer from hughes and it's $500 so i figure i should use it. I looked all through the RV and i don't see a 50/30 dogbone so i'm not sure if the guy i bought it from used it or just stored it in the RV. My question is - Can i take my 50 amp hughes autotransformer, plug it into the 50 amp pedestal at the campground and connect it via a dogbone to my 30 amp RV without any damage? if so should i dogbone it to the 30 amp pedestal and do i need a surge protector as well?

Thanks for the help.
Auto transformers are great so go ahead and use it. Any way you connect it via dogbones to the RV will work.
Also remember that the AT will only regulate voltage and not stop surges etc so yes, you should also have a surge protector
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Old 05-13-2013, 09:53 AM   #5
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if fero-resonant type of transformer it is in full saturation to regulate VOLTAGE, surges are changes in that voltage that cause changes in the current.

The ratio of over- voltage to output voltage depends on the design of the unit.

The ones we had back in the day were bullet proof, nothing got through them, but those were designed for communication equipment in hostile environments.

Connect to 50 amp connection on ped, then plug into one side as 30 amp
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Old 05-13-2013, 10:09 AM   #6
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You might also consider putting it on Craigslist and advertizing you are looking for a trade plus cash. When we moved up to a 50A class A from a 30A class C I sold our 30A Autoformer, no problem.
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Old 05-13-2013, 10:32 AM   #7
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Quote:
Originally Posted by mevman
Auto transformers are great so go ahead and use it. Any way you connect it via dogbones to the RV will work.
Also remember that the AT will only regulate voltage and not stop surges etc so yes, you should also have a surge protector
Not sure about the Hughes, but my PowerMaster VC50 protects "against multiple surges of up to 3,580 joules." Thats the same level as the PI PT50C. The VC is in front of the PI SP - so post to VC - VC to SP - SP to house. The PowerMaster VC will block any surge - and raise / lower any low / high voltage from the post by 10% before it can be shut down by the SP for < 104 volts / > 132 volts. The SP can then do it's other jobs for open ground, reverse polarity, open neutral, etc. Expensive but functional.

Check out specs on the VC you have. It may or may not work like the PowerMaster.
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Old 05-15-2013, 05:58 AM   #8
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I wouldn't trust a transformer to do the job of a surge protector. IMHO. I have both (of course).
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Old 05-15-2013, 07:49 AM   #9
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I wouldn't trust a transformer to do the job of a surge protector. IMHO. I have both (of course).
I think it's the only way to go (why I added both). Cost a bit over $1k for both but price an AC etc. Low voltage operation is hard on things over time and shortens their life. How much shorter - is the 104 Volts low enough to hurt? I don't know and don't have to think about it. Like any other safety device or insurance - some like the peace of mind. Others self insure. It's up to you how you want to roll. I didn't wear a helmet when I rode my bike as a kid, but my kid did. YMMV. Be safe and have fun.
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