This artillery outpost station turns on only when shells or repair packs are low. It's self-sustaining, but it's should be connected to the power grid, especially during the initial clearing stage.
Designed to work especially well with https://factorioprints.com/view/-Ko4Un71BhDDTUvorRv5
Used with a supply train which contains construction bots, repair packs, and artillery shells. Add a second artillery wagon to the supply train to increase the speed of clearing out a new outpost.
The station name should be set to something standard when the base is up. I set mine to "Artillery Drop Off" and then have an "Artillery" station that the refuel train runs between. The station name isn't set in the blueprint because you don't always want the train to come immediately. Sometimes I have to run back to base for supplies first, or let it clear out nearby bugs via laser.