FlexSolar20W Portable Solar Panel, High-Efficiency Monocrystalline PV Module Power Charger with Dual USB Ports for Phones, Tablets, Power Bank, Camera and Other Off-Grid Applications

Power: the power is good, I not one to test the out put, but I live in Arizona, always sunny and this this can charge my phone and back up battery pack no problem.Charging: it does good at charging even on some what cloudy days.Ease of use: it's perfect for a carry on, i have it in my bug out bag which goes everywhere with me. It's compact and light weight, bu5 be careful because the panels are water proof but the charging ports are not.Quality: it's tough, and durable. I would recommend.

Like the size and output of this panel, even better than it offers USB-C and USB-A connectivity. Was able to hit rapid charge speeds on my Pixel 7 in just moderate sunlight. Definitely recommended for camping or emergency use.

I prefer this to larger panels. Charges the phone, or fan, or Jackery as needed.

Great to have on hand for if and when the power goes out.

This is the second solar panel that I purchased from Flex Solar The last panel only worked at half power. This panel doesn't work at all. Im out over $100 now. Do not buy anything from this company.

I had the 20w version for about a year, and the 30w for a month so far. Same size panels but the forth really makes the difference.The 20w needed to be in perfectly clear sky and angled nearly perfect to draw 9v/1.4-1.6a, almost never giving more than 15w. The 30w version consistently outputs 9v/2.0a even it's in a wonky angle. (My device's max input is 20w)In overcast weather it drops to around 0.8-1.0a but maintains the 9v.I highly suggest folding some cardboard to about the shape and thickness of the empty space left inside the folded up panels if you're putting it in a backpack. The "hinges" have wires in them and repeatedly creasing the hinges is how I broke the 20w. I used the box it came in and it doubles as a way to prop it up.

These FEEL very solid and durable, but they don't last, which is a shame because their charging power is excellent. I bought 2 of them in late March and both died on me at the end of August. When it happened, I tried them both with different charge cables and different devices, so I know it was these FlexSolar chargers that were dead (Is it reassuring that they're manufactured so consistently that they both had exactly the same short lifespan?).I've had much better luck with the BigBlue 28w solar charger panels. I have 2 of those also and after a full year of rigorous use they're both going strong (Nektech has what looks like the same thing under a different name). The BigBlue doesn't charge quite as fast as the FlexSolar chargers did, but I'll gladly take the MUCH longer durability of the BigBlue over the slightly stronger charging power of the FlexSolar.*Note - When charging in high temperatures, cover your device (phone, tablet, powerful bank, drone battery, whatever) in insulating material like a heavy-duty mailing envelope (cardboard works better than cloth). ALTERNATELY, YOU CAN BUY A LONGER CHARGE CORD AND KEEP YOUR DEVICE IN THE SHADE. I've had my devices stop charging at midday with three different solar panel brands - and guess where I live? Florida. At first I suspected the solar panels going bad, and since they're inexpensive enough, I'd buy a different brand. Eventually, though, a notice popped up on my phone - "Charging will continue when the device cools down."Insulate your device when charging in high temperatures.Another problem is what I call "backcharge." It's the gradual draining of your device's battery while connected to the solar charger when there's no sunlight. So keep an eye on whether the panels are still in the sunlight or not - which isn't as easy as you might think due to distractions by other things.

I haven't had much luck actually getting the 30 watt version to charge either my anker power banks, or Iphone XR direct by USB, or with the included USB C adapter. I have been using it placed in a window on sunny day, in both direct and indirect sunlight. Maybe it's just not enough light. I am not sure it would be significantly brighter trying it outside.The best I have been able to achieve is that I think I got it to charge my anker power bank, enough to charge my iphone about 50%. Most of the time, even with the sun directly hitting the panel.My iphone for example will show that its charging, but never actually charge.I am going to try this out a little more and I might revise my review accordingly if I get it to work better in more direct sunlight.I bought this because I wanted to be able to charge power banks, my phone, or flashlights in case of power outage. I would have thought the 30w version would be able to handle this in less than optimal light, but maybe I need a higher wattage panel for my needs.