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Old 11-24-2013, 03:13 PM   #15
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If you Google 'how to test a weak breaker' most all the links say to test VOLTAGE at the breaker connections. Problem is, this only tests that it's allowing electricity to go through, it doesn't test amperage. You'll need a clamp on meter to test amperage. If your A/C and microwave is within their normal range, I'd just replace the breaker.
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Old 11-24-2013, 04:25 PM   #16
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Quote:
Originally Posted by tluehrs View Post
Thank You, it just may be a weak breaker. How can you test the breaker?
If possible. Swap wires to another breaker or swap on another breaker, either new or from elsewhere.
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Old 11-24-2013, 04:48 PM   #17
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Our Holiday Rambler Vacationer is 30 amp and the generator is an Onan 5500 and when we are on the genrator and turn on the microwave, the AC and Microwave kick off. RV generator will not run the air cond. and microwave at same time. Any ideas?
I assume all works fine on shore power. That should suggest the breaker that is tripping is the one on the generator and not the main panel breaker. A 5500 watt generator is capable of supplying more than 40A of service, so the generator shouldn't be overloaded.


Here's where I'd look, based on my assumptions above.
-- If you have a voltmeter, use it to measure the generator voltage when the fault occurs. Ideally, you have one that will hold highest and lowest readings. If the voltage drops to the 105V range, it could be the generator's voltage regulator.
-- As stated by others, check the circuit breaker. Again, I assume it's the one on the generator that is tripping.
-- If the generator's breaker is a 30A breaker, and it should be 40A, it could just be product aging. Your AC compressor and fan tend to draw more current over time, especially at start up. A 1500 watt microwave, an AC unit, the battery charger, and a couple of lights puts you close to 30A. If you have an electric hot water heater, you are really pushing 30A service. I'm guessing hot waterf is propane.
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Old 11-25-2013, 01:37 AM   #18
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Have had that problem when on gen power. I have inverter with a 100 amp battery charger . If batteries are low it pulls lot of amps add that to AC micro and is the water heater on elec. like it's been said you need to check amps drawn.
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Old 11-25-2013, 07:25 AM   #19
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Some ONAN 5500s have a 20 and 30 amp breaker, Some have 30/30 (mine has 30/30)

Some installs, the idiot at the factory put the main loads, which includes the microwave, on the 20 amp breaker.. And ut just the rear A/C on the 30 ... It should be the other way around.
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