This 40amp charge controller works very well.I was nervous making this purchase as there was very little information/reviews online.But I decided because of the great price and the well advertised information on amazon it was worth the risk.The package was delivered within two days and the product was in perfect condition.I installed the charge controller within a hour.It also comes with a wifi communication module.The Wifi Communication module was very easy to install and configure.Within two minutes I was able to login to the app and view all of the charge controller data.I have had the charge controller for three weeks now with no issues.The charge controller is of a very high quality standard.I would definitely recommend this charge controller.