inputs.text: great pwm controller - tried 3 different pwm controllers sml30 noticeably best one panels mounted large window apartment not install thehem roof not place also shade lot despite instapark monochristalline panels producing 3 amps 15 20 volts little test see loss power going battery bank surprise none zero nadaat time experiment clear sunny day las vegas measured amps going controller panels 32 amps immediately measured amps going battery no loss fact reading little higher 35 amps thought maybe sun got little brighter live vegas always sunny lv bottom line think best pwm controller money buy simple no programing needed