Validcells is the number of solar cells that can see the sky.
How to use solar power panels in sky factory 3.
Cellgen is the amount of rf per tick each valid solar cell generates.
A solar panel cannot power the compressor directly and cannot power it using the solar flux reborn cables either.
However you can connect them using an enderio energy conduit.
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As for the cobble i think it s prioritizing the crate over the transfer node so i d recommend moving the transfer node to the crate instead of the cobble gen.
Rf t is the final amount of rf generated per tick.
If you use auto crafting in refined storage it gets really easy to make them without being fiddly particularly if you get the auto smelting of sand into glass right.
However in my most recent playthrough i scrapped the extreme reactors side and made solar panels from solar flux reborn.