Hi hiker.
All those gennys are charging one battery bank. The 6 smaller gennys are charging at 24 volts. Its a 48 volt system. 2 sets of 24 volt batteries wired sires.
There are 2 GE ECMs they have 9 full wave bridges each, 1 Garbogen, one 3/4 HP 3 phase conversion, one 1/3 hp single phase conversion, one 260 volt tape drive PM motor and the big half hp conversion with the Lakotas at the highest point on the crankup tower.
The big half is charging at 48 volts its a single phase/2 phase after conversion.
There was no reason for the selected group. It just ended up that way. Some will be changed out and maybe I'll add 1 or 2 more?
They all charge this battery bank. There are a few batteries added that are not in the picture.

JK TAS Jerry