mppt vs pwm

Keep in mind, as you add more and more controllers, you also need more wiring AND more circuit breakers between controllers and batts. And 23 amps input would require heavier wiring from panels to controllers.

Perhaps the best solution would be to go with TWO higher voltage controllers, and wire the panels in series/parallel. But to keep costs down, you may have to give up adjustable voltage set points. And mc4 'Y's don't come free.