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Old 12-20-2010, 01:22 PM   #1
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Do all Converters Hummmmm!!!

The converter in my 99 Safari hums loud enough to be heard at night and thus is very annoying to light sleepers (me). Does new technology remove this noise? I would like to replace it with one that is silent. Any suggestions?
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Old 12-20-2010, 01:26 PM   #2
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My Intelipower 9245 makes no noise.
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Old 12-20-2010, 01:28 PM   #3
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Hi, mine makes an occasional cooling fan noise, but other than that it is silent. Maybe yours is working too hard trying to charge bad batteries?
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Old 12-20-2010, 01:54 PM   #4
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What? I can't hear you, my converter is making too much noise!

Actually the one in our Safari is very quiet- you so hear the fan once in a while. In our previous SOB the thing hummed horribly. I'd open it up and nudge a few parts and it would stop- until they bounce around again.
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Old 12-20-2010, 02:04 PM   #5
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The converter in my 99 Safari hums loud enough to be heard at night and thus is very annoying to light sleepers (me). Does new technology remove this noise? I would like to replace it with one that is silent. Any suggestions?
The "humming" is caused by the metal laminations of the transformer vibrating.

Transformers can be repotted, but it takes 3 to 4 days time to do it correctly.

When the "varnish" soaks in between the laminations, and then is allowed to dry out, the laminations can then no longer vibrate, which in turn, silences the problem.

Andy
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Old 12-20-2010, 02:52 PM   #6
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Yanked my old one out and replaced it with an IOTA from Randy at Best Converters . Works great, nice and quiet.
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Old 12-20-2010, 02:55 PM   #7
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Hmmmmmm!

It's the transformer in most that does the humming. It steps the 120 volt down to the lower output voltage (ie 12: 24 volts); it is then rectified and filtered; some are regulated and processor controlled. The old Univolt is famous for it's hummmm! I have one in my trailer, but it doesn't have a fan. I am waiting for my new PC9245C to come in. Then BYE BYE Univolt.
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Old 12-20-2010, 03:01 PM   #8
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I may yet replace my stock Parallax converter because of the fan noise, which is problematic when someone is sleeping on the gaucho with their head 8" away from it.

It does not, however, hum.

Most modern switching power supplies don't. So, yes, technology has solved this.
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Old 12-20-2010, 04:49 PM   #9
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The converter in my 99 Safari hums loud enough to be heard at night and thus is very annoying to light sleepers (me). Does new technology remove this noise? I would like to replace it with one that is silent. Any suggestions?
The converter is humming because it does not know the words.

Seriously, many of the older Airstreams that used a Univolt had a toggle switch hidden behind the curtains near the Univolt. The switch is still on the wiring diagram for my trailer, although it is not physically present. The switch was intended to quiet the hum so people could sleep on the couch.

If you have no switch, you could wire one in or else use a short extension cord to get a plug on the Univolt out where you can reach it to unplug at night.
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Old 12-20-2010, 05:01 PM   #10
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Mine is making noise also...

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Originally Posted by azflycaster View Post
My Intelipower 9245 makes no noise.
My inverter is making noise... and I also would like to buy the Progressive Dynamics 9245: 45 Amp Converter , but I am afraid I would have difficulty in installing it... Is it difficult? How would you convince me?
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Old 12-20-2010, 05:17 PM   #11
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It took me about an hour to install mine, but the 12 volt fuse panel was not attached to my old unit. Half of the time was taking the shelf out of the bathroom closet and putting it back in.
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Old 12-20-2010, 05:21 PM   #12
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Andy at Inland RV is correct.

In the TV repair business, as it used to be before everything went to flat panels, TV repair folks used to paint a varnish onto the coils and let it soak in and dry for a couple of days. That would always stop the hum.

I would think newer converters would not use large transformers any more - there are better ways to do this with switch mode power supplies that are lighter, more efficient and capable of smarter current/voltage delivery.
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Old 12-21-2010, 08:06 AM   #13
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Help: no problem

Adore: The converter PD9245C is on Ebay for $129.59 including shipping.
Lots of people here to help you install it.
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Old 12-21-2010, 10:23 AM   #14
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Let me guess, you have a Magnatek? I replaced my noisy Magnatek (installed by a PO) with a Progressive Dynamics, which I only hear occasionaly when the cooling fan comes on.

Christopher
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