Review on MEGASOLAR 60W Solar Charger - Solar Panel with Charge Controller, Dual QC3.0 USB 5V - 12V, 🔌 and DC 12V 15V 20V Output - Portable Solar Charger Shoulder Bag for Laptop, Solar Generator, and Phone Charging by Zachary Pete

I ordered a 60w model. This model has 6 panels with 4 cells each, for a total of 24 cells. Their total area is 0.39 m^2. The standard GHI for solar panels is 1000 W/m^2. The seller claims they are 22% efficient SunPower cells. 0.39 m^2 * 1000 W/m^2 * 0.22 = 85.8 W. This panel is supposed to produce 85 watts, but it only produces 60. I have a couple of my own SunPower/Maxeon 1-efficiency cells of 22% that I can compare with this panel and the color is completely different. True cells are a brilliant blue, while these cells are a very dark gunmetal color. It's also pretty obvious that this isn't a Maxeon due to the way they connect. 60W/(0.39m^2 * 1000W/m^2) = 15.3% efficiency. This is the bottom cell. They look like P series tiles but aren't shingled so I don't know what they are. Definitely not what I paid for! Also, the bundled barrel connector cable has poor heat shrink connectors on the wire, and the inner wires have been exposed and the insulation under the heat shrink has been damaged.