NOT mppt - not even close
This you-tube review explains it.  [...]<br />This controller is not doing anything to buck amperage. I tested it myself using two "wattsUP" power meters - one from the panel to the controller, second from controller to battery.  Amperage never gets bucked, always less than what the panels are giving, never more.  Never get close to the 200 watts of output the panels are rated at - and yes they are square to direct sunlight and pushing 200, but only getting 145 out.<br />Not only that, but they are not Amazon, so your return "request" must go through greenalife, where it apparently goes straight to the bit bucket.  AVOID LIKE THE PLAGUE!  total rip off.
Rating: 1 stars