Some examples of static units (armour and weapon tech levels set to 1 for easy comparison):
Pillbox-HAV
Transport Size (tons) 60 Cost 1.2 Armour 1 Hit Points 3
Annual Maintenance Cost 0.15 Resupply Cost 36
Heavy Anti-Vehicle: Shots 1 Penetration 6 Damage 6
Purpose: Support garrison infantry with a heavy anti-vehicle weapon, and do so cost-effectively. Is most useful on worlds without mountains or jungles.
Battalion HQ, static
Transport Size (tons) 62 Cost 4.24 Armour 1 Hit Points 3
Annual Maintenance Cost 0.53 Resupply Cost 0
Headquarters: Capacity 10,000
Non-Combat Class
Purpose: Be an HQ for a garrison battalion of 10k size. Is somewhat harder to kill, for the price, than a garrison infantry HQ.
15cm Railgun STO-Point Defence
Transport Size (tons) 417 Cost 52.24 Armour 1 Hit Points 3
Annual Maintenance Cost 6.5 Resupply Cost 0
15cm Railgun I
Range 60,000 km Tracking 12,000 km/s Damage 3 / 1 Shots 4 Rate of Fire 15
Maximum Fire Control Range 60,000km Chance to Hit at Max Range 0%
Maximum Sensor Range 1,261,564km Max Range vs Missile 113,541 km
Purpose: Provide anti-missile protection for a planet (plus light gunfire). Essential if you suspect the enemy might swoop in and nuke your precious homeworld!