An easy way to make it more balanced is to increase its power usage ,it doesnt make much sense for an orbital ion cannon use to only 50 Kw , when this is a very much late game weaponry with late game levels of dmg.
it would make more sense for it to need an actual power infrastructure to be able to be used reliably right now you can throw up a space platform 1 solar panel and the ion cannon and your good 2 go. (also for comparison 50Kw over 5mins can barely power a 2Kw heater for 2 hours this is a ridiculously low amount of energy to fire something like an ion cannon)
Using Plasma cannons (from bobs warfare mod) as en example base for power use feels balanced
A Consumption of about 28.8 MW round it up neatly at 30 MW while charging (while on cd) and when ready to fire a min consumption of lets say 10 MW
And a bonus would be if you give it neighboring bonus to consume like 5 or x% less power (and possibly 2 or x% reduction in cooldown) p/neighboring ion cannon idk how this would work code wise but itd be a nice addition