There's a reason why I took my inverter offline after making sure that it was installed correctly. A cheap power meter now serves to measure my power generation instead.
Only deep inspection of the silicon and code can improve the situation.
Perhaps Western blocks could develop provably secure silicon IP and code, formally verified, and perform continuous random sampling on imported goods, including full multilayer silicon inspection; publish it for free and refuse to import products that don't cooperate.
Nothing prevents the satellite to transmit the commands at night, if that feels more convincing to you.
Ask yourself what is the active area of a photodiode in your TV/... ? What is the active area of your light-bucket on a roof?
If we are discussing the solar panel that powers your outdoor garden light, I don't suggest to apply the precautionary principle, but we are talking about products that sum up to a significant fraction of grid power generation.