nutbuster
Moreno Valley
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Joined: 11/23/2008
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Specs:
2001 27' Terry Trailer.
RV type Samsung MicroWare = (MW). RV has 15amp circuit brakers. Generator is a WEN AVR Automatic 6.5HP 3000 Cont,., 3500 Surge. I believe when attached to the four terminal plug (120/240v) that it is rated at 27amps on 120v. All testing was with new fully charged marine batteries that were connect to the circuit.
My problem: MW will work when pluged into my home 120v house plug, (15amp loose extension cable) both ends of ext cord have good grounds.
With the MW plugged into the stock RV interior plug (inside cabnet) it power up (main LED flash logo) but none of the buttons will work...tired pluging it into the outside aux plug with generator running...will not work. Tried several plugs inside the RV same problem. I even tried pluging the 15amp loose extension cord...same one I used when pluged into the 120v but pluged it into the generator 15 amp seprate plug same problem. Again MW Works perfect when pluged into the 120v house from my garage.
I can fire up the AC on high and the generator will run it no problems with nice cold air comming out...and I know this is way over 15amps....more like 22-25 amps.
Seems the MW does not like my generator! Or is there something else?
Thanks for any help!
NB
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Deen
Vancouver, WA
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Joined: 12/07/2000
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Sounds like the MW want's sine wave power and your gen is putting out MSW. Does everything else work OK. Some MW are more sensitive to the MSW output of some generators.
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garry1p
Oklahoma
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Your generator is probably MSW generator (Modified Sine Wave) it does not put out a clean sinusoidal wave more of a chopped off sine wave.
Some MW will run OK and some won't the true sine wave generators like the Honda 2000i will cost a lot more but the MW should run OK with a true sine wave generator.
Garry1p
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BFL13
Victoria, BC
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Is the microwave on one leg of your 50amp and the a/c on the other and you are plugging the RV into the gen and only getting the 110v leg the a/c is is on and not the other leg the microwave is on?
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PaulJ2
Northwest Oregon
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It is probably a generator problem. I have a 3000W Coleman generator that does this very thing also. The microwave has a very short in duration but heavy start up surge. Generator is a shunt regulated design so an instantaineous load voltage drop also drops the rotor voltage and it dosen't recover quick enough.
The Honda inverter type doesn't do this because there is a large capacitor with enough storage to handle a short surge.
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Oldfordman
Marysville, WA
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When I have this problem with my Microwave, when trying to run it on my 3500W generator, I have to make sure the converter and water heater are off. I also need to turn the refer to GAS mode.
When you are running your microwave from your House AC there is plenty of power supplying it, even if it is on the end of a cord.
When using the generator, it is possible that the refer is cooling, using AC which can account for several hundred watts. If the Converter is trying to charge the battery it can also account for 400-500 watts. It all adds up. The issue with the generator is the "inrush" or starting load for the microwave. When it is turned on it draws a lot of electricity until it is actually "cooking". The Generator doesn't have a lot of reserve so the voltage drops. If it drops low enough the microwave just sort of sits there, loading the generator but not really starting up. Get rid of the extra loads and it might just work fine.
My 3500 Watt Champion will run the microwave or A/C unit fine as long as they are the only thing it is running. It will also run the converter along with the AC as long as the AC has started up and is running. When I am using the generator, I keep the water heater and refer on "Gas Only" to avoid extra AC load.
Try these steps and see how it works.
PS: gary1p----
Most Generators produce a pure sine wave. They are rotating units and the only real difference between them and the ones at the power plants are SIZE.
It is possible that a low cost "Inverter Type" Generator may produce an MSW output but not the Champions, Wen's, Colemans, etc.
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MrWizard
Van Nuys, Ca
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garry1p wrote:Your generator is probably MSW generator (Modified Sine Wave) it does not put out a clean sinusoidal wave more of a chopped off sine wave.
you are wrong, that is a standard construction geneset with rotating generator head and sinewave output, he has a problem in his trailer wiring,
bad breaker ?
open neutral on the circuit ?
tripped or bad GFI ?
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garry1p
Oklahoma
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OK I stand corrected not MSW but they do put out less than a perfect sine wave.
Also; He said he plugged it directly into the generator with no other load and it would not work so it could be a bad generator unable to produce its rated output.
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nutbuster
Moreno Valley
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Joined: 11/23/2008
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More info:
You got to remember it's not even allowing me to punch in 30 seconds, it's like the whole soft screen is dead...does this with or with out the 12 battries connect too....Oh...I got a receptital test going to do that now...and check the GFI...hmmm.
Will get right back on this.
NB
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Wayne Dohnal
Bend, OR.
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Joined: 03/09/2003
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Many of the conventional generators have a downright lousy waveform, caused by a low end voltage regulator and/or windings that were optimized for cost instead of quality. Sometimes, a certain piece of electronics just doesn't like the incoming power. To eliminate everything else, try connecting the microwave directly to the generator via a short-as-possible extension cord. If it doesn't work then, the 2 units just aren't going to play together.
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