"I'm buying a car. Will it cause RF interference to my marine band radio"..?
Seriously, this question is as much relevant as yours is.
I say this because: I installed solar for years in California. I've installed residential, commercial and worked on a couple of those ground mounted monstrosities you see in the Mojave Desert.
Residential: It's all going to be up to the installer and the equipment they are installing. Usually the owner isn't even the operator of the solar production device. This means you need to ensure that all DC cabling is twisted. All optimizers (if being used) need to have type 31 chokes on the inputs and the outputs. This is going to get expensive quickly, if they have a large system. All panels will most likely need to be removed from the roof if this is done after install. All ground wire needs to be run INSIDE the EMT. There needs to be a ground bushing at EVERY entrance and exit to the conduit. All conduits, frame rails, etc. need to be bonded.
Commercial: Everything I said above, but it's easier. Most can be done with a man lift as they are parking structures (for the most part).
Industrial: It probably isn't effecting you. As these are usually considered industrial they have to keep to the same power generator requirements as a power plant.
IE, I could pull on the street of someone with rooftop microinverters with my mobile setup and know immediately there was a solar system on the street. I could home in on it by my S Meter.
On an industrial, nothing. Maybe a half s unit WHILE ON THE PROPERTY.
I do know I have put RF quite systems up by SMA (Sunny Boy), Fronius, APC Systems and Enphase. The Enphase and APC needed RF Toroid networks at the input and output. The SMA and Fronius would meet emissions testing just fine. When you started adding optimizers at the rooftop both the SMA and Fronius would start needing additional filtering on the roof top.
Bottom line is: Once the system is installed, it's harder to get fixed.
Once the system is installed, it's you vs the homeowner and installer and supplier.
Some companies are better than others. A previous employer in California told me it was more cost effective to chase down problem complaints than pay our 12 dollar an hour lackey to spin wire in a drill at the shop, making us twisted pairs available to pull. It was actually an easier pull, probably breaking even by the time all the labor was figured in. He didn't care. It was all about the time spent at the facility.
Lastly,
If that is your only point source of noise, the MFJ1026/26, ANC, etc noise cancellers work AMAZING at a single source of noise.
--Shane
WP2ASS / ex KD6VXI
Down here in the Caribbean. Where I hear our governor has stated we will all have solar in the next year.