I have 10A pwm charge controller and also two others spare, what I would like to know can I join them together as my solar system grows, or will I have to just get higher rated pwm charge controller 30A or something.

This is a mobile setup 12v 2x80watt panels, 10A pwm charge controller, I want to double the panels and maybe then some, as time goes by, but I understand there is a limit to how many panel watts a charge controller will allow, I don't want to change over to 24v I understand this doubles the charge controllers handling I wish to stay with 12v.

So simple question can I chain link pwm charge controllers.