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Old 02-11-2018, 07:50 PM   #1
bgschust
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Loud circuit breaker humming

I can hear my circuit breaker humming with a constant sound when there is no obvious load on the breakers -- everything is unplugged and all of the lights are off.

Is there a strategy I can use to identify the specific wire that might have a loose connection or which breaker has an issue? Or maybe there's another issue. I've tried cycling all of the breakers off and that did not stop the sound.

Notes:
* The converter fan is usually off, so it's not making any noise.
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Old 02-11-2018, 07:54 PM   #2
chuckster57
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If your plugged into shore power, your probably hearing the cooling fan of the converter. Unplug from shore power and see if it goes away.
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Old 02-11-2018, 08:43 PM   #3
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I am plugged into a 400W solar array connected to 12V batteries that power a 1000W 120V AC inverter.
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Old 02-12-2018, 03:04 AM   #4
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I am plugged into a 400W solar array connected to 12V batteries that power a 1000W 120V AC inverter.
Most likely the cooling fan then. Turn it off and see if the sound goes away.
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Old 02-12-2018, 08:07 AM   #5
bgschust
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It's not the cooling fan. It's an electrical sound. Any other thoughts?
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Old 02-12-2018, 08:25 AM   #6
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If you are using solar, isn't there an inverter somewhere in the system? Could this be generating the hum?
Added: If you think it is a loose wire, make sure all of the hot and neutral lugs are tight in your distribution panel. Make sure you are unhooked from any power source.
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Old 02-12-2018, 10:05 AM   #7
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It's not the cooling fan. It's an electrical sound. Any other thoughts?
Find the breaker marked CON/REC and turn it off. As mentioned it is probably the converter trying to charge the batteries also. JM2¢, Hank

If your inverter is on, it will be causing a drain even if there is no load on it. With an '06 rig, it might be time to clean the cooling fan on the converter especially if you travel with fur-kids.
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Old 02-12-2018, 10:13 AM   #8
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Are you using a Pure Sine Wave inverter? If not, many electrics will hum due to the low quality of modified sine wave power.
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Old 02-12-2018, 08:55 PM   #9
bgschust
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Fair point, it could certainly have something to do with the inverter power coming in, so I could try hooking up to a generator to see if that changes anything. I've heard the DC converter could be making the noise. Is there a way to turn that off?
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Old 02-13-2018, 07:11 AM   #10
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Fair point, it could certainly have something to do with the inverter power coming in, so I could try hooking up to a generator to see if that changes anything. I've heard the DC converter could be making the noise. Is there a way to turn that off?
Hank mentioned it earlier. You can and should turn off the CON/REC breaker when using this type of setup.
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Old 02-13-2018, 08:13 PM   #11
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Need to verify the hookup. Are your solar panels providing DC power directly to your RV battery bank? Do you then run the Inverter from the RV batteries and feed the output to the 30 or 50 amp AC feed to your trailer realizing that you will need to be very economical in AC usage or are you hooking it up by some other method?
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