I agree with you, my friend - the solar panels metaphor is very good.
Well, I have got about 25SP and it is not a problem but I am highly probably not the best example due to my rare activity. Moreover in these days.
I think anything below 20SP could be a definite struggle.
I believe I can share and like about ten posts daily. More than this could turn out to be a bit of a problem. I would probably run out of RC (~20% per day gets restored, not dead sure about this number).