[Elecraft] OT: RF noise in solar photovoltaic system

[Tom Azlin W7SUA]

Hi Alan,

We put in a 10KW array on our garage roof using two SMA 5000TL-US-22 
inverters to grid tie. I could not see any difference in noise floor or 
moving noise bands with the inverters running or with both the DC and AC 
disconnected. Perhaps just lucky? We used a local solar company that has 
been around 30 years who was aware of RFI issues. The local panel 
distributor is a ham by the way. As an aside both inverters can provide 
up to 1500 watts at 120Vac if the grid is down. One inverter feeds that 
1500 watts to the kitchen and the other to the shack.

My HF dipole runs above the roof mounted panels with the feed about 70 
ft south of the garage.  I did not do any thing special for RFI. 
Electricians provided the UFER ground to the inverters. The two 240Vac 
lines from the inverters run underground about 75 ft over to the utility 
panels on the north side of the house.

They also said for just charging my station batteries using the 700 watt 
legacy solar array that came with the house that I should use a PWM 
charger rather than the noisier MPTT chargers. Have not picked a charger 
yet. The local solar guy also provided that 700 watt array to the 
original owners of our house as it was an off-grid solar home.

You can see the panels on my QRZ page's aerial view.

73, tom w7sua

On 7/18/2016 12:05 AM, Alan Bloom wrote:
> I am contemplating having a solar photovoltaic power system installed on
> my roof.  There was an article by K1KP in April 2016 QST about the hoops
> he had to jump through to reduce the noise level from his system low
> enough that he could operate the HF bands.
>
[snip]
>
> Alan N1AL
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