I did the same and I figured the computer is clever enough to shut down the reactor and turbine as soon as the energy cell reaches 90% or so and kicks back on when reaching around 10%, this is to save fuel consumption and not have a constant flow of energy being pushed into a full energy storage.
Very, very clever this thing.
Wish I understood it better!
My solution, do like I and Dire did, build a Draconic Power Cell any tier you'd like but bear in mind Tier 1 is less than a resonant cell (45mil vs 50mil.)
I built a Tier 7 and it's a MONSTER!
Hope this helps!