SolarEdge, the worldwide solar power company, is currently under legal threat in Germany for illegally generating Radio Frequency Interference (RFI). Without immediate remediation steps, they will be prohibited from selling additional products there. Industry officials fear this ban could spread across the remainder of the EU.
IMO, it would be good if the US would follow in Germany's footsteps on this issue.
The EU has determined that a very high percentage of Solar Panel controllers, and LED lighting, operate illegally and generate excessive RFI that interferes with legal radio communications devices.
There is also evidence that some improperly installed solar units, and LED lighting can interfere with Wi-Fi networks.
See the following link for additional information:
Ironically, our so-called High Efficiency appliances, like washing machines, are another gross polluter. American made products are usually better than imported ones, as FCC requirements are routinely ignored by foreign manufacturers. The FCC claims to not have enough manpower to adequately fight the problem. I suspect it is due to other reasons.
The press in the US has pretty much suppressed negative solar power information.
But for an update, see the following:
It should always be remembered that just because a primary interfering frequency does not affect you directly, noise from its distant harmonics, and their inter-modulation products can seriously degrade or stop communications of other devices.
Hams, meaning Amateur Radio Operators, have long been aware of inferior solar system noise. The Water Fall displays in the first part of this video show the wide band interference these systems create. Note that at night, when the sun is down that the noise is removed or tremendously reduced, proving the source is the solar power system.
Ham Radio operators have known for quite some time the problems caused by RFI caused by poorly designed Solar Power arrays. The link below explains the problems they encounter and shows some of the techniques they, and you, can use to pinpoint this problem.
For those of you studying for your CWAP, the included RF Water Fall displays demonstrate how useful this tool can be for confirming interference.
You don't even need a Ham radio to perform some of these tests. An ordinary AM radio, tuned to a more quiet part of the band, will screech loudly near these and other interference sources.
If you are contemplating the installation of solar equipment, insist on using only fully certified FCC CLass "B" equipment.
FCC Class "A" equipment is noisier, not recommended, and BTW is not legal for residential use.