I installed a filter inside the breaker box.
"XPF 20A Wired-In Noise Filter"
XPF 20A Wired-In Noise Filter - X10 Pro
I want to see if the squarewave-like MSW waveform can be cleaned up a bit.
Maybe round off the sharp edges a bit..
I ran my 200w computer room load for a while and didn't hear any buzzing.
But I did hear buzz when I got close to the filter. Those iron cores are singing.
When the sun comes back out again (maybe Friday), I'll crank it up again
and see what the line looks like with the O-scope..
Neat thing happened. When I shut off the MSW inverter, the relay dropped out,
and re-connected the grid to my PC.. Did not re-boot!
And drop-out is a lot slower than energizing the relay (turning on the inverter).
Edit: 3/2/2011
The filter buzzed a little, and didn't round of the shoulders of the MSW very much.
Then, I saw it was loading down the inverter! The output of the inverter supplies the breakers.
With all the breakers open, I should have had about 70 ma of DC inverter load..
But, it was closer to 200 ma of DC current. I assume the high frequency component
of the waveform was seeing the caps as a load. So, the filter is
out of the box..
My plan is to try a large DIY iron-core inductor in series with the inverter AC output.
It will be made from about 10 feet of #10 wire, coiled around
a one pound iron rod. (or maybe mild steel).
