Running a T-30/40 charger requires a 9500 RUNNING watt generator.. make sure that is running watt.

That gives you wiggle room for other power consumption (pump, fan, etc)

so 2 T-30/40 chargers will need 19kva

This charger should more than handle your application.

https://www.electricgeneratorsdirect.com/Westinghouse-WGEN20000-Portable-Generator/p117180.html