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Old 02-10-2004, 08:47 PM   #15
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John --I was also thinking of installing a suppressor, not so much for high voltage from the power company, but from the campground system. If I'm reading you right I should have little concern regarding this happening. While I know strange things can happen, are we, or could we be, at some risk of an overcharge from a campground system? Some of those suppressors are downright expensive & if I don't need one, it would be great.
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Old 02-10-2004, 11:45 PM   #16
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low vs. high

a.e.,

you are much more likely to get low voltage in a campground than high, perhaps so low you can damage your a.c. unit.

checking with a voltmeter when you have load running is your best bet to avoid problems. at home or away.

one other thing that can cause high voltage in electrical services is an open neutral. also quite rare, but this usually only can cause problems in a 240 volt system. you get high voltage on high resistance items such as t.v. microwave computers etc. and low voltage on low resistance loads such as motors and heaters.

99% of "surge suppressors" won't catch this either.

go ahead and get one if you want, again you could spend your money on better things like beer!

john
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Old 02-11-2004, 08:14 PM   #17
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Re: low vs. high

Quote:
Originally posted by john hd
a.e.,

you are much more likely to get low voltage in a campground than high, perhaps so low you can damage your a.c. unit.

checking with a voltmeter when you have load running is your best bet to avoid problems. at home or away.

one other thing that can cause high voltage in electrical services is an open neutral. also quite rare, but this usually only can cause problems in a 240 volt system. you get high voltage on high resistance items such as t.v. microwave computers etc. and low voltage on low resistance loads such as motors and heaters.

99% of "surge suppressors" won't catch this either.

go ahead and get one if you want, again you could spend your money on better things like beer!

john
My home was directly struck by lightning a few years ago, the only thing the surge supressors did was allow me to collect for some of the damage from their manufacturers' warranties...
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Old 02-11-2004, 09:44 PM   #18
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John --Thanks for the info. One less thing to buy. I want to install a permanent voltage meter where I can somewhat monitor the voltage, both ac & dc. Any suggestions on a meter type that is a permanent mount?
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Old 02-11-2004, 11:31 PM   #19
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a.e.

i suppose you could go to radio shack and see what they have, some sort of panel could be constructed.

for the same amount of money you could buy a good quality volt/ohm meter and keep it in the trailer.

then you would always have one with you on the road to troubleshoot problems.

what the heck, get both!

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Old 02-12-2004, 02:05 AM   #20
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Question for John HD !

I was told by a someone at a dealership (not A/S) that in one campground near us the power supply would sometimes take a big swing in voltage that would cause the control card to burn up; say, on your refrigerator.

I find it difficult to believe there would be such a swing in power that this would be likely. I guess the voltage would drop in say a "brown out" or something like that but could it fluctuate such that it would cause this to happen?

I think that the newer cards might have fuses on them which would protect that from happening anyway. Does anyone know if this is the case?
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Old 02-12-2004, 05:39 AM   #21
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answer for bill...

bill

i would think it almost impossible to burn up cards or starting boards. because they are all 12 volt and fed by the univolt and battery. batteries make good filters.

if a campground was on the same line as a large industrial plant such as a smelter or something with a large electric furnace, i could see problems developing.

more likely, a bad voltage regulator on the line could cause a + or - swing of 10%. still not enough to wipe out electronics. line capacitors can cause similar problems.

in the end, not to automaticly take the power company side. i would suspect the campgrounds wiring. however, power companies can and do screw up!

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Old 02-12-2004, 07:36 AM   #22
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The best insurance......

in my opinion, is one of these - usually less than $20.

Not having one cost me a roof mounted AC.

Both low and high voltages are damaging to equipment.

Absolutely necessary if you run a generator. I found out first hand how high a voltage can go with a generator set only a bit above specs. I think it was a low voltage situation that killed the AC.

It certainly avoids speculation if a campground is delivering adequate voltage to the campsite or not.

This is one item that should be standard equipment on each and every trailer sold.

It just plugs into a wall socket and constantly monitors the AC voltage.
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Old 02-12-2004, 09:09 AM   #23
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Surge Surpressors

The surge surpressor won't protect you from low or high voltage.
They are primarly for instantaneous short term spikes measured in thousands of a second. As john hd said they won't help on the DC side since the battery filters spikes but if you run a generator or when camping and your neighbor does something to cause a spike they could protect something on the AC side.

Radio Shack sells the meters like 87MH shows and they are your best bet for monitoring your AC for damaging low or high incoming AC.
I wouldn't leave home without one.

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