Looks like no one is answering this, so will I. The platforms have the same range as the turrets itself.
As example, the battleship pulse turrets have the same stats as the ones the players can buy. Same goes with every other weapons mounted on the platforms.
The Cerberus Platform has a range about 4-4.5 k for me, the Type 1 module, full of basics had 1.5-2 K for me, never had solaris, though it would only have 0.5-1.25 K range