We purchased this controller for our installation of two 360W panels on our Cal29 sailboat. We primarily use the boat when we sail to and from Mexico, and live on the boat while there, and sometimes in the Bay Area as well. The controller has performed extremely well for us on the water, maximizing the usage we get from solar exposure. This is a much harsher environment than most installations. Although it is inside the cabin, there is constant exposure to salt water atmosphere, and the boat, of course, moves constantly. I would have no hesitation recommending the controller for this type of installation, or for less challenging situations.