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Old 02-12-2018, 07:56 PM   #11
bgschust
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It's definitely not the inverter making the noise since that's outside and far away from the breaker panel.
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Old 02-13-2018, 05:12 AM   #12
JRTJH
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Locate your power distribution center. One of the 15 amp circuit breakers will be listed as "CON/REC" or similar. That is the converter power breaker. Turn it off. If the "humming" goes away, it's either the fan in the converter (it is speed regulated and only comes on under load, as the load increases the fan speed increases, so the "humming" would get louder) or it's the transformers inside the converter. My guess is that on a 2006 model, there's significant dirt/dust/hair clogging the fan entrance grill and/or the fan blades. That debris is causing the fan blade to wobble, creating a "humming sound". The other possibility, the transformers inside the converter are possibly loose and/or the insulation has broken down enough that the magnetic field has increased sufficiently to cause vibration at 60 hz when power is applied.

Turning that CON/REC breaker off should stop the humming. If it does, locate your converter and investigate the cause. I don't know when Keystone switched from the old Magnatron brand converters to the more modern WFCO converters, but the Magnatron brand always "hummed" even when new. The humming got worse as they aged.
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Old 02-13-2018, 05:36 AM   #13
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What JRTJH said! Most probably in the Converter electronics/magnetics. Then after your test leave the Converter off since you are running off of solar with no shore power to supply any additional demand power.
In normal use the Converter will supply power to charge the batteries and power all of the 12VDC items when connected to shore power but in this arrangement the Converter will try to charge the very same batteries that are powering the Inverter with. It will try but at maybe 80% efficiency you are losing significant battery power.
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Old 02-13-2018, 06:11 AM   #14
mfifield01
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Originally Posted by bgschust View Post
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, 07:13 PM   #15
Bostongone
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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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Old 02-14-2018, 06:13 AM   #16
mfifield01
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It's definitely not the inverter making the noise since that's outside and far away from the breaker panel.
The inverter itself will not make the noise. Items such as the power bricks for TVs, laptops, and other electronics will hum from the unclean power. I bet the converter is humming as it doesn't like the power from the inverter. In this case, the converter should be off anyway.
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