Ultra Thin Solar Charger Panel with USB Ports

Lightweight charger, can charge my mobile phone under 3-4 hours of direct sunlight, from 0% to 100%. Solar panels can work very well, a great product.

Very nice, works well. Thanks you, Bob

I bought the "10 W" version of this. 1) It's nowhere near 10W output. With it carefully aimed at the sun on a clear day in Virginia, the panel produced 4.9W according to my USB power meter. The power output is very dependent on the angle of the panel. Everyone hanging it vertically on the side of their backpack is doing it wrong and will get like 2W output. You want to maximize the area of the panel as viewed by the sun! If you aren't going to adjust it continually to track the sun across the sky, put it on the top of your backpack facing directly up. 2) It is very light. I trimmed the extra plastic off mine and reduced the weight from 3.3 to 2.8 oz. This is ridiculously light for a solar panel. For comparison, my "21 W" 3-panel Anker panel, which in practice maxes out at about 13W, is one of the lightest panels out there. It weights 1 lb exactly. 3) Here's some math, because people often struggle to do electrical conversions: This panel maxes out at 5W if you have it pointed perfectly at the sun. If you point it straight up, you might average 3W over the course of the day, since power = sin(sun angle). 3W over 10 hours is 30 Wh (watt-hours). A 10,000 mAh USB power pack is 38 Wh. A typical cell phone battery is 13-15 Wh. Therefore you can charge about 3/4 of a 10,000 mAh USB power pack over the course of the day, assuming it's totally clear and you point the panel straight up. If you adjust the panel to point toward the sun, you can do significantly better, and if there are clouds, you will do significantly worse.

Out of the box it works wonders at dawn inside the house until the sun goes down!

Excellent charging device. Instantaneous energy when plugged in the presence of sunlight.