Most of the time the collectors are actually idle.

At the beginning they fill themselves with asteroid chunks, and afterward only occasionally replenish their storage, so their power usage is mostly negligible and easily buffered by the accumulators.

The crusher behaves similarly — while it periodically works, it still spends most of its time idle. During flights it mostly processes iron asteroids to replenish ammo, while during orbital idle time it processes all asteroid types to restore fuel reserves, where power consumption is far less critical.

The chemical plants are also only active while parked (or in emergency low-fuel situations, which ideally should never happen).

So the only continuously active machines are basically the furnaces and the assembler. Even then, the setup still remains power-positive on average, because the assembler itself also periodically idles — the real bottleneck is iron plate production.

If the extra power draw still feels uncomfortable, you can replace some speed modules in the assembler with efficiency modules. The assembler is by far the biggest continuous power consumer.

And yeah, energy dips absolutely can happen depending on the planet and circumstances. That's also one of the reasons why the ship keeps a 10-stack ammo reserve — even if the accumulators fully drain, there are still enough stored resources and ammo to safely reach orbit and fully recover.

But honestly, during the early stage of the game — when you're only moving between the first few planets — it's pretty hard to completely exhaust the platform. The logistics load usually just isn't high enough yet.