They were also equipped with PDCs to protect them from enemy fighters, bombers and boarding craft. By receiving power from ground-based power plants, orbital platforms can achieve a recharge and reload cycle as short as five seconds. These weapons are capable of accelerating a 3,000 ton tungsten/depleted uranium projectile to 12,000 kilometers per second, or 4% of the speed of light, delivering 215.8944 exajoules (equivalent to 51.6 gigatons of TNT) of kinetic energy on impact - enough to completely vaporize most conventional capital warships. The station's primary armament is a single Series 8 'super' Magnetic Accelerator Cannon.