My setup 300Ah battery bank (12V) Solar panels (18V) 300W Placement of panels not ideal but good enough. Panels are vertically mounted. Help me choose a good quality charger controller. I would like to maximize my charging time and optimize my panel supply. I am keen on MPPT, but just cant find one I like that is within my budget. Is the PWM really going to be a poorer choice for my 12V 300W system? Please advise? Where to purchase as well would be great as well!