Review on ZEALLIFE 8A Solar Panel Charge Controller: Battery Regulator for 12V Solar Battery Charger, Maintainer and Power Kit, Ensuring Safe Protection for 12 Volt Batteries by Steven Barbon

This only worked intermittently and many hours have been spent to this day trying to figure out why. I thought maybe there was a bad connection so I wiggled the solar panel wires and to my surprise they immediately disconnected. There were no breaks or abrasions. At first I thought that some latch inside must have come loose, so I took it apart. Whoever was going to solder that connection decided to take a break that day I think because those wires were obviously never soldered in place. It's amazing how it worked at all. I soldered the connection and am testing to see if it works. But I thought I was buying a work item, not a school electronics project.