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Old 09-06-2016, 10:17 PM   #1
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Hum from circuit breaker box

What is causing the hum? Is it a fan? What can we do about it? We didn't notice this before, but now it is constant.
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Old 09-06-2016, 11:31 PM   #2
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That box has three distinct components.
One is an AC power distribution panel, filled with circuit breakers... but they won't hum.
Another is the DC power distribution panel, filled with fuses... and they won't hum either.
In the bottom is the converter/charger, which converts 120V AC power (from the shore power cable) to 12V DC power for the battery and everything that runs on 12V DC... so it's almost certainly the converter/charger.

The converter/charger does have a fan, which should run only when the converter/charger gets warm enough to need cooling; it shouldn't run all of the time. Electronic parts can also hum, but that usually isn't audible with a modern converter/charger working properly.
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Old 09-07-2016, 10:35 AM   #3
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The only time I've had the converter fan run constantly is when I've had the fridge on 12v and been plugged in to shore power.... I switched the fridge to 110 and the fan stopped.
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Old 09-07-2016, 01:27 PM   #4
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I have had the same issue recently. The fan running intermittently when it never did before. This while plugged in to shore power.
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Old 09-07-2016, 04:00 PM   #5
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Thank you
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Old 09-07-2016, 04:05 PM   #6
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Quote:
Originally Posted by luckyone View Post
I have had the same issue recently. The fan running intermittently when it never did before. This while plugged in to shore power.
Thanks for the info.
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Old 09-07-2016, 04:09 PM   #7
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Quote:
Originally Posted by Brian B-P View Post
That box has three distinct components.
One is an AC power distribution panel, filled with circuit breakers... but they won't hum.
Another is the DC power distribution panel, filled with fuses... and they won't hum either.
In the bottom is the converter/charger, which converts 120V AC power (from the shore power cable) to 12V DC power for the battery and everything that runs on 12V DC... so it's almost certainly the converter/charger.

The converter/charger does have a fan, which should run only when the converter/charger gets warm enough to need cooling; it shouldn't run all of the time. Electronic parts can also hum, but that usually isn't audible with a modern converter/charger working properly.
Thank you for your help.
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