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Old 12-04-2010, 10:07 AM   #29
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Amen gary. perfect explaination. and i am getting full use of my autorormer right down to 103v. of park power where i want to be shut down to inspect to see what is going on. i don't wat to operate my coach's equipment below 113v.
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Old 12-04-2010, 02:14 PM   #30
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I have seen several posts mentioning Progressive Industries Power Management protector. We've also looked at the Surge Guard Power Monitor Plus 50 amp power monitor (Lists for about $600 but can buy for lots less.) Has anyone used the Surge Guard model?
I hope you got a little info on Progressive vs Surge Guard. I'm sorry the thread got hijacked to discuss the autofomer and not your question.

I apologize for being part of the hijack.
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Old 12-04-2010, 02:48 PM   #31
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Hi Gary,
You mentioned your autoformer draws 1 amp of current at full load, what is the source of this information?
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Old 12-04-2010, 03:36 PM   #32
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great info I will have something before next spring
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Old 12-04-2010, 04:03 PM   #33
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Hi RJay,
My Surge Protector Power Transformer takes 1 AMP of power when operating at full capacity. This 1 AMP is part of the electricity I receive from the 50 AMP power post at the site I am renting. The transformer does not add any extra load the the CG's electric system. The power used by the transformer should already have been calculated into the CG's electric capacity as it is included in the power that I can use any way I want, up to the maximum allowed by the power post.
I'm not going to get into the argument as to whether or not Autoformers add to campground loads. Because of the fact that (at least in Summer) much of the loads are AC motors, whether or not the increased voltage at the AC lowers the amperage enough to actually save power can only be proved by a field test - maybe at a rally?

As to your using the maximum power available at the campground pedestal, it is worth pointing out that a campground wired to the NEC regulations does not have to supply the rated power at each post. Just like your house, they have a "Demand Factor" used for the design. Table 551.73 lists the factors which vary with the number of sites. 1 site is at 100%, 10-12 sites 50%, 36+ sites 41%. Obviously, if everyone at a large, fully occupied campground pulled the full amount at each pedestal, there would be a problem!

I personally feel this demand factor should be adjusted more conservatively since modern RVs tend to draw far more power than when the original table was made, but the only thing the NEC has added is a FPN (fine print note) "These demand factors may be inadequate in areas of extreme hot or cold temperature with loaded circuits for heating or air conditioning."
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Old 12-04-2010, 07:52 PM   #34
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Hi RJay,
The information is in the manufacturer's documentation.
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Old 12-04-2010, 07:56 PM   #35
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Thanks Gary, I appreciate it.
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Old 12-04-2010, 08:29 PM   #36
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Originally Posted by dill View Post
I have seen several posts mentioning Progressive Industries Power Management protector. We've also looked at the Surge Guard Power Monitor Plus 50 amp power monitor (Lists for about $600 but can buy for lots less.) Has anyone used the Surge Guard model?
I have the Progressive and really like it. I put in in line so it protects the coach from both the generator and shore power. I have an automatic generator starter and the delay interval for the Progressive allows the generator to warm up prior to being loaded by the coach. I had problems before I installed the Progressive unit where my generator would autostart and the airconditioner or heat pump was immediatly on line and would stall the generator. No longer a problem with the delay.
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Old 12-08-2010, 02:22 PM   #37
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We have the Progressive Industries 50Amp EMS Hardwired unit.... easy to install.... somewhat difficult to work myself into small places, but the EMS hard wire is the way to go!!!
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