Is there a power/CPU limit?
No.
Fits are limited by grid space, hardpoints, heat and the breach's build-rating range:
- Grid space: every cell under a module must be part of the grid and free.
- Hardpoints: no more battery modules than battery hardpoints, and at most six turrets of one family.
- Heat: modules and thrusters generate heat you must manage. If heat reaches the top, the reactor SCRAMs: a control rod burns and the ship shuts down for 3 seconds.
- Build rating: your ship's rating, cargo included, must be within the breach tier's limits, e.g. 6,000 at most for Stratum 1.
Tip
The fitting screen's Time to SCRAM shows how long you last with every active module running. It leaves out engine heat, so in flight it's shorter.