Mod-sine inverter noise [RE-wrenches]

[jay peltz]

Hi Bob-O,

I just talked with a customer who had the same situation.  They had a old
2000 series that died and was replaced with a DR and they have much more
noise and all that changed was the inverter.  So I guess its the box not
the install.

And someone was looking for a Millivolt setback thermostat, Grainger has
them.  I just ordered one for $55, but they have lots of choices.

Jay Peltz
Peltz Power

"Bob-O Schultze, Electron Connection" wrote:

> Hiya Carl,
> It's a constant wrassle with the modified square wave inverters
> sometimes. Can we assume you've checked the usual suspects? No open
> ground in the ac receptacle feeding the VCR? The TV antenna wire not
> running close to and parallel to any ac wiring? Neutral ac wire
> connected to earth in one and only one spot in the whole ac system?
> The DC side bonded at the same spot or at least close? If you have a
> ground rod for ac and another for DC, are they well bonded together?
> If so, try twisting the inverter cables if possible. If that doesn't
> help, try disconnecting the ground on the DC side only. Sometimes a
> ground loop can occur. Sometimes you're just screwed.
> Good Luck, Bob-O
>
> >Merry christmas all: I just replaced a customers old 2012 with a
> >DR3624 and I told him it might be slightly cleaner than the old one
> >but he tells me the vcr buzzes even louder than before. I didnt just
> >replace the old one ,I gave him an entirely new system and grounded
> >everything and I wonder if there is some little trick I can use to
> >subdue the noise even slightly? My understanding is that most
> >consumer electronics are poorly shielded and dont much filtering.
> >Carl Reuter
> >
> >Land and Sea Solar, email:
> ><http://us.f29.mail.yahoo.com/js/creuter@rocketmail.com>creuter at rocket
> >mail.com Phone:1-310-283-9768
>
> Bob-O Schultze, Electron Connection
> PO Box 203, Hornbrook, CA 96044
> 800.945.7587 fax 530-475-3401
> www.electronconnection.com
>
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For info contact list moderator by email:
 michael.welch at homepower.com

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