You can always sacrifice a bit of the optimal ratio for a cleaner design but you should stay in the area of 0 8 0 9.
Best solar panel setup factorio.
Though in all honesty you probably aren t ready for solar panels yet if the cost bothers you.
During daylight hours every panel provides the maximum power level 60kw.
This means one solar panel produces an average of 42 kw over one day and night cycle.
Or more precisely you need power consumption in w 30 kw solar panels.
Looks like 912 accumulators to 16 solar panels which is a 0 560 75 ratio.
This layout has 170 accumulators and 196 panels.
For each 5 solar panels you need 3 accumulators.
There are either 5 36 extra accumulators or 6 38 missing solar panels.
Keep in mind that these numbers are approximate you may want to have a buffer for laser turrets if nothing else.
Generated power will increase decrease linearly during dusk and dawn and no power is produced at night.
The ideal ratio is 0 84 accumulators panel.
The optimal ratio is 0 84 thus a more ideal setup would be 21 accumulators to 25 solar panels.
Here is a quite popular blueprintable design by madzuri.
Overall this design has a continuous power rating excluding roboport drain of 8 232mw.