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inverter causing interference on AM radio

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Posted by solar bus driver on July 29, 2008, 7:48 pm
 
Hi, does anyone know of any fixes for AM radio interference caused by an
inverter (Outback)?

This is on a bus (RV)...   Whenever the inverter is on, I get a lot of
buzzing on AM radio.  As soon as I turn off the inverter it clears up.

is there any way to fix this or do I just have to live with it?

thanks



Posted by Ron Rosenfeld on July 29, 2008, 8:28 pm
 
On Tue, 29 Jul 2008 15:48:29 -0400, "solar bus driver"


Which model inverter?

Did you check with Outback?  They have a forum where these kinds of
questions are often asked and answered.

How much buzzing?  Is it present only with weak signals, or also a problem
with strong signals?

How sure are you that the inverter is properly installed?  Bad grounds can
sometimes cause this issue.
--ron

Posted by solar bus driver on July 30, 2008, 2:15 am
 

It's the VFX 2800 watt 12 V inverter vented (mobile)


Nope.  Is the forum on their website?   I guess I could just call them.


It's pretty loud.  Makes it difficult to listen.  It's there even on strong
signals.  Note, the inverter is 12-15 feet away from the inverter.


Yes it's installed properly.  It's grounded to the chassis of the bus, on
the DC and AC side.



Posted by Martin Riddle on July 30, 2008, 2:31 am
 
|
| >>
| >
| > Which model inverter?
|
| It's the VFX 2800 watt 12 V inverter vented (mobile)
|
| >
| > Did you check with Outback?  They have a forum where these kinds of
| > questions are often asked and answered.
| >
|
| Nope.  Is the forum on their website?   I guess I could just call them.
|
| > How much buzzing?  Is it present only with weak signals, or also a problem
| > with strong signals?
|
| It's pretty loud.  Makes it difficult to listen.  It's there even on strong
| signals.  Note, the inverter is 12-15 feet away from the inverter.
|
| >
| > How sure are you that the inverter is properly installed?  Bad grounds can
| > sometimes cause this issue.
|
| Yes it's installed properly.  It's grounded to the chassis of the bus, on
| the DC and AC side.
|
|
You might have to put a choke and cap in series with the DC input. Not trivial.
I managed a similar feat with one of those cheapo auto cell phone chargers.
You can also try slipping the + terminal thru a ferrite core, like Fair-rites 43
material.

Cheers



Posted by Ron Rosenfeld on July 30, 2008, 3:44 am
 On Tue, 29 Jul 2008 22:15:26 -0400, "solar bus driver"


I don't have an Outback inverter, but from what I've read, and what others
who have that equipment have said, you should not be getting what you
describe if the inverter is properly installed and functioning properly.
There are potential issues with grounding if the grounds are not properly
bonded (or if the AC neutral is not properly bonded).

I have a pair of Trace SW5548 inverters, and have no audible buzz in my AM
receiver.  But mine is not in a mobile setup.

The forum is on their website at http://www.outbackpower.com/forum/

I've had occasion to call them about my Outback MX60, and I've gotten good
responses that way, also.
--ron

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