1 AU - 150 000 000 km

Here's a list of what arrays are for:
* Fits on a ship (rigs + modules): equipment array
* Goes in a module (ammo, cap charges, scripts, etc.): ammunition array
* Fighters: small ship array
* T3 Subsystems + T3 Hulls: subsystem array
* Ship: use a ship array (typically the same size as the rig size)
* Drones: drone array
* Starbase and sovereignty structures can only be built at a station or outpost.
* None of the above: component array