I bought these _hoping_ they would perform 75-80% of their advertised performance, but found that under optimal conditions they are nowhere near performing (about 47 %). It's essentially a 100 watt deployment, not 200. Within the first hour of being in the sun, they began to delaminate. I took several photos over the next few hours and was able to follow their progress as they worsened. I'm not sure if they will last a full week of use. The power output continued to drop over the two days I used it. Eventually, one of the connector plugs fell apart. The nail in the coffin in the already established idle purchase. I have a lot of experience with different panels and I can say with confidence that these are the lowest quality panels I have worked with and I do NOT recommend them.