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Your solar farm was very helpfull for me.

I just add some arithmetics.
Assuming assemblers inserted with productivity modules 3
1 beacon - 480W
1 assembler(with beacons) - 42W
1 assembler(without beacons) - 966W

In my last picture ratio 1:2 (assembler to beacon). If I add some rows below ...

Suddenly I felt my first idea is not so good. There is a more simple and efficient way. Now assemblers surrounded by 6 beacons and it's quite enough to get -80% consumption.

My english is broken and I hope I don't need much explain my images.
Blue - beacons. Green - assembly machine/furnace/drill. Each building on center will be effected by 5 beacons. Space between buildings can be 0, 1 or 2.
I have green modules in beacons and full productivity - result in the ...