inputs.text: heavy duty pwm controller - speaking mppt maximum power point tracking tech support 30 minutes mppt technology prices wattage ratios convinced unit cannot change 24v input 12v output raising current 12v battery mppt controllers three distinct charging stages bulk acceptance float indicator leds stages needed specific capacity mppt based array open voltage bench test numbers would use instapark 30amp connecting several 12v panels parallel handles higher amperage low priced pwm controllers eliminating controller panel could save money