ST RFI [RE-wrenches]

[Solar Technologies]

We noticed that 2 ST2500s we installed interfered with lower band AM up to
1/2 block away from the inverters.  It was our understanding that this was
an effect well known to Trace.  If this is a Trace issue, perhaps Trace
ought to furnish the Faraday cages...  anyway, Sunny Boys don't do this.

Roger DeNault
Solar Technologies

----- Original Message -----
From: "Chuck Heath, SunPower" <sunpwr at jps.net>
To: <RE-wrenches at topica.com>
Sent: Thursday, September 27, 2001 12:21 PM
Subject: Re: ST RFI [RE-wrenches]


> >Hey Wrenches,
> >
> >I've been talking with a guy that has two ST2500 inverters installed
> >in his shop. He's also hooked on AM talk radio. The inverters are
> >blitzing his shop radio.
> >
> >Trace is suggesting Faraday cages for the inverters. Think this would
> >be effective? Any of you found a simpler solution to ST generated RFI?
> >
> >Thanks dudes,
> >
> >Joe
> >--
> The first thing to determine is if the interference is coming through the
> AC wiring powering the shop radio, or is actually being radiated in the
> air. This can be determined with a battery-powered AM radio, or car radio
> parked near his shop.
>
> To limit RFI, Jeff's suggestion of ferrite beads is wise. I'd also
> suggest getting a better quality AM radio connected to an outside,
> long-wire antenna if the source of interference is the wiring rather than
> radiation. Having a stronger AM signal will help override any
> interference. Sometimes just turning the radio AC plug around (the old
> non-polarized types) will eliminate interference.
>
> The suggestion of twisting the inverter cables and enclosing them in
> grounded metal conduit should also help.
>
> Just my 2 cents...
>
> Chuck Heath (living inside radios for 50 years)
> "Plugging into Sunshine since 1989"
>
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