| Re: [GMCnet] A good reason to keep your Generator. [message #311635] |
Tue, 27 December 2016 20:04 |
Jim Miller
Messages: 501
Registered: March 2008
Karma: 10
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Senior Member |
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Hi Ken,
I don’t see an autotransformer’s lack of isolation as a problem in the RV environment - if the referenced item is really an autotransformer at all. Unless one drives a ground rod and bonds the GMC’s chassis and body to it when running the generator then there is no frame of reference to work from anyway; the RV is in its own electrical domain because it sits on top of six pneumatic insulators.
What does concern me about the device you referenced is the “with regulation” mentioned in the description. That tells me that it may be a ferroresonant constant-voltage transformer which introduces more problems - such as audible noise, misbehavior due to the failure of the capacitor in the resonant winding - but most importantly the inherent current limiting nature of this type of transformer. The latter might be a real problem for high inrush loads like the A/C or refrigerator compressors I mentioned in an earlier message.
For the RV application I was thinking more along the lines of a plain old traditional potted-core transformer such as would be used in the industrial environment. A 5-6 kva model wouldn’t be very large nor heavy.
—Jim
BS/Math 1991 with 0 hours of “power” courses
1977 Eleganza
1977 Royale
Hamilton, OH
> On Dec 27, 2016, at 8:30 PM, Ken Henderson wrote:
> As I've mentioned here before, I suspect that the reasonably priced units on eBay are autotransformers rather that isolated winding designs. That suspicion is based on the prices and on the weight (the one listed below is quoted as only 25 lbs). What's your opinion? In the application we’re discussing here, I don't see that as a problem though. Do you?
>
> http://www.ebay.com/itm/5000-Watt-Heavy-Duty-Voltage-Regulator-Converter-Transformer-Step-Up-Down-5000W-/130987516279?hash=item1e7f76e177:g:dtcAAOSwDN dV5MNU
> Ken H.
> BS/MSEE with only one 3 semester hour "power" course in 1971. :-)
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Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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