Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Works as advertised

I use this controller with a 15 watt Brunton Solar Flat panel on a boat hoist that uses a 12V DC motor for the winch. The 12v battery remained charged throughout last summer with no "over charging". The controller is easy to install and provides an indication of "charging" or "charged". Amazon has a good price for this item.