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or set the grave to "critical" to be filled first, there is a tab to change it at the bottom left in "storage" when you click on the grave.

Attacking early just makes the raiders "detect" you and they will launch there attack early so you get a bit of a buffer as you can fight whilst withdrawing, as raiders do not defend, they will  always advance to you.

diods could be less efficient, as they would waste energy as heat, so too many in series would have no energy left over to charge a battery or power lights very well

Is it possible to make a "cleaning zone" that's independent of the "home zone" so I can make my settlers only clean inside?