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Old 04-23-2015, 07:19 AM   #1
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Inverter Question

I have a question, if someone has advice, I would greatly appreciate it. My inverter is a rear storage compartment and I hear a constant buzzing in the bedroom where it is located. My question is, is the buzzing normal?
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Old 04-23-2015, 07:48 AM   #2
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Originally Posted by jdell87 View Post
I have a question, if someone has advice, I would greatly appreciate it. My inverter is a rear storage compartment and I hear a constant buzzing in the bedroom where it is located. My question is, is the buzzing normal?

Can you tell us which inverter make and model you have? Buzzing to some extent is normal on all models and is especially more common in models with a modified sine wave output. That being said buzzing that is louder than normal could imply that there is a problem with the inverter. I have seen ones that buzz louder than normal that put out 130-150 Volts on the AC side which is not good.
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Old 04-23-2015, 07:53 AM   #3
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I have a question, if someone has advice, I would greatly appreciate it. My inverter is a rear storage compartment and I hear a constant buzzing in the bedroom where it is located. My question is, is the buzzing normal?
Converter or inverter? It is probably your Converter and the buzzing is kind of normal. Shouldn't be real loud but a humming I would consider standard. It is the charger working on the batteries and will kick on and off if you have stuff running in the coach.
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Old 04-23-2015, 08:11 AM   #4
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Knightab is correct. If you are hooked up to shore power, the inverter should be in standby. The converter, which converts the shore power to 12v for lights, battery charger, etc. will have a slight hum. If you are not on shore power, the inverter will hum, but unless you have a domestic fridge or are watching a movie, you are unnecessarily using battery energy and you should turn it off when not needed.


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Old 04-23-2015, 08:22 AM   #5
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If it is a Inverter/Charger, there will probably, be no Converter.

The charger section of an Inverter/Charger can buzz, just like while inverting.
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Old 04-23-2015, 08:27 AM   #6
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If it is a Inverter/Charger, there will probably, be no Converter.

The charger section of an Inverter/Charger can buzz, just like while inverting.
This is true but if it is factory installed I have yet to run across an Inverter/converter model. They always pick the cheapest stuff and dual purpose units I have seen are far from cheap
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Old 04-23-2015, 10:46 AM   #7
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Buzzing or hearing it's fan running?
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Old 04-23-2015, 01:54 PM   #8
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If the noise seems to have gotten louder then one of you transformer plates has become de bonded. Or the fan but it is normally the transformer inside. The best thing to do is replace the unit. There is a fix but you being kind of new at this I wouldn't try it.


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Old 04-23-2015, 03:21 PM   #9
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Sounds like the transfer switch, try powering up the generator and listen for the buzz. Last weekend I had the same thing happen to a friends, we started the gen and then switched back to shore power. The buzz stopped. I guess the transfer switch was still hibernating.
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Old 04-23-2015, 04:03 PM   #10
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My bet is that the buzz is your transfer switch rather than the inverter or converter. That's probably under there too, and some are prone to buzzing (noisy relays).

Chargers are more likely to have fan noise than buzzing. Few of them have transformers anymore - all solid state.
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Old 04-24-2015, 02:25 PM   #11
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Thank you all for the advice. you are all right it is the converter not the inverter. I am going to try running the generator thing to see if it helps.
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Old 04-24-2015, 02:34 PM   #12
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Do you indeed have an inverter/charger? On my coach the inverter was an option, so I have both and like you said the converter kept me awake, so I unplugged it, just don't turn off the charger on your inverter, if this is the problem your having?
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Old 04-24-2015, 03:04 PM   #13
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Converter and charger are synonymous for this discussion. They both change 120 VAC to nominal 12 VDC. Some with better control than others. All of them will use a transformer to change the voltage. The generator merely changes the source of AC. I think you will find they have all been "all solid state" since selenium rectifiers were popular after WWII. The alternatives are big, hot, and not very efficient. ;-)
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Old 04-24-2015, 07:07 PM   #14
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I think you will find they have all been "all solid state" since selenium rectifiers were popular after WWII.
But they still used transformers to step down the voltage. And crude electronics to regulate the charge voltage and current. Yeah, they were/are hot and noisy and inefficient.
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