I still pump them at stage 6, no inverter no battaries no generator. but I am pushing my luck. If I'm home I open the tents, but keep the wendy dark, luckily the wendy breathes so RH only sky rockets with rainy naturally high RH times. though my IPM i do like it's my religion, I skip church, use the hour to spray my whoooooole garden, tents and outdoors even ornamental stuff, literally everything on my property gets sprayed, helps a ton with PM and pest pressure.
light cycle.... whole different topic. but the results show in my plants.
also helps that I have 1mx1m tents that can stand open and passively let RH out, where as with bigger tents you'll have to run a fan somehow.
anything more than stage 6 I think I'll just veg indoors and finish outdoors.