Obvious example of:-
One 20A radial with a single "portable solar panel" as allowed.
An unrelated circuit changing a battery.
OK so far?
Call them circuit 1 and circuit 2 if you like.
You have a sensor nearby the solar panel on circuit one but not connected to either electrically or physically .
The sensor is in circuit 2 and signals the battery to start or stop its charging cycle in some alignment with sunshine present.
Could you cause the battery and solar panel to align sufficiently to coincide to agree to make some gain and if you could then is it worth going to the time and expense to have any real benefit.
It would not surprise me if somebody actually tried it.
DIY plug in solar isn't compliant if it charges a grid connected battery, the words, and intent, are clear. People will try all sorts of things when they really shouldn't.
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