This is with a solar panel tier 6 from thermal solars which outputs 512rf/t attached-
https://gyazo.com/025215f458abe1ba48b9eed502d36806

This is with a creative energy cell from RF tools
https://gyazo.com/c2efc1f8746b1e2efcb9e01c99638350

A Tier 1 solar that does 16 RF/t goes up to a certain point then starts going back down.

https://gyazo.com/f81ecee0ff25978ecb82336761245184

TechReborn-1.11.2-2.1.1.42-universal