You can’t squeeze more out the power from this one. You only need 1 Large Rechargable Battery to run the whole circuit.
Make sure that the battery has a minimum of 100 power going in at (mostly) all time to keep the battery up.
This fits for 4×4 rooms and 3 floors with a total of 48 planter boxes.
Since scrap farming with hemp is nerfed from Rust very recently, this will do best as a tea farm. Sell pure teas for high prices.
Rust Faming Guide, Rust Farm Guide