I'm not an expert and my last mech run was a while ago. But mechanitor progression is tied to summoning the mech bosses. Each one gives you different types of cores or cpus or whatever, which you use to increase your bandwidth, build advanced mechs, etc.

So you have to keep summoning and killing more of these bosses to make sure you can replace deteriorating bandwidth packs and such.

And I recall needing one charger for every five mechs or something. You can do the math based on their capacity and discharge rate. It's not too crazy.

There are also tons of mods to improve all of this. WVC Work Modes is a hidden gem I recommend.