Thanks I have a meter and am aware it is the inverter (and the smart meter). The owners of the house talked with their electrician and someone at the solar panel company and decided it was too much. I had told them the panels would need to be covered with a black cloth to prevent the panels overheating and being damaged, or even igniting. I offered to pay for that.
I can tell where the modem is in an apartment above me. If I sit in a chair near a hidden modem, after awhile I will look and find it. The symptoms are very specific. I was “electrocuted” (neuro puts it that way!) and was hospitalized in 2014 and that started this problem.