FlexSolar 20W Solar Panel Charger 5V USB-A USB-C Output Portable Foldable Small Power IP67 Waterproof Camping Backpacking Hiking Emergency for Phones Power Banks Flashlight Fans

I've been testing four of these FlexSolar 120 watt panels with a LiFePo4 2 Kwh 2000W Pure Sine Wave Solar Generator/UPS that can handle up to 500 watts of solar panel input. ( @ less than 15Amps and less than 48V ) The generator will also take an additional 1100 watts charge from the wall, but I have a timer between it and the wall socket so that it gets 110V charging power for a couple hours a night, in case it didn't get enough sun to fully charge it during the day. This lets the solar generator charge and run with power from the panels during the day, but makes sure it gets a full charge once a night from the mains, just in case.FlexSolar's site says these can be wired in series and/or parallel, but they don't say how many would be the maximum. Interestingly, they each have a little red light that will turn off if they are not happy with how they are connected. (Disconnect and reconnect them properly, and the light in the center of the panel's junction box comes back on.) Wiring these as two parallel sets of two panels in series, their open circuit voltage exceeds my generator's 48V input limit by a couple volts, but in actual operation their combined voltage isn't even close to threatening to do that, so I'm declaring this combination a functional success.You can see in the pic that I have my 4 panels each hanging vertically, yet I've seen these manage to put out just over 110 watts each in this orientation (442 watts max, so far today). It seems they really ARE 120 watt panels and would happily give me the missing 10 watts each, if I would just point them at the sun.This setup is powering my home office, and this review, with 414 watts of solar generation as I write this.The performance of these panels exceeded my expectations. Hanging them this way, though makes me wish the top two grommets were a bit more solidly reinforced. Still, 5 stars for these with their nice stands, their small form factor compared to their actual output, and their all weather durability.

I have both the 40W and this 50W solar panel, and I love them both. This 50W panel charges my power banks at 40 watts using the Type C port, which is impressive as many other solar panels I have don’t achieve this. I have a 60W panel labeled 60W PD, but it only reaches 30 watts at best. This solar panel is truly made of high quality materials it’s very tough and has some weight to it. The foldability with the built-in case is of high quality and feels heavy-duty, unlike my others that feel like they will rip apart. This is the go-to for charging USB devices that need higher wattage for faster charging.My ultimate favorite solar panel is their 40W version. It charges at 30-35 watts, is super light, super small, and very well-built. It’s my favorite.

They advertise 120 W output, on a bright sunny day without any clouds, at the most perfect angle, and in a large open space, my power bank showed all the way up to 135 W of continuous input. It can produce above what is advertised, well done! A very slight change of angle by only 15 degrees can instantly drop it down to only 60W, and even a tree branch far off in the distance can drastically reduce these numbers. The electrical connections on the solar panel side have rubber O-rings, and fit very snug, it does appear to be water resistant on that end, the end that you plug into your power bank, have no water resistance. The stands it comes with would only be useful in a ZERO wind situation, but, and are even a bit tricky to balance with no wind lol, I think that is pretty obvious from the pics. The case it comes packaged in is nice, and it all folds up compact and light. I would say it is exactly as advertised, and performs as expected, for a decent price.

This has no problems charging my Jackery in a short amount of time. In the sun I have seen close to the 60 (high 40s to low 50s) advertised watts input into my power station. Great product.

Vert compact and portable. I saw a video review where someone criticized it because they couldn't get full charging due to it being flat on the ground, but all you have to do to remedy that is make use of the built on loops and attach a few low cost carabiners to them and you can hang it up to collect solar power at any angle you desire. This product, in conjunction with any small rechargeable battery system in the 300 to 1000 range will give you all the power you need for basic small electronics such as weather radios, cell phones, and laptop charging. Its ideal for natural disaster prepping on a budget. Granted, its not going to power an entire house, but that's not what it is designed for.

It works great for a little while but then it's like it overheats and my per pack shows "otc sup" on the monitor. I'm guessing it overheated because the next day it worked fine again for a little while but then that code popped up again. I tried another power pack and got the same message in the screen. Then I tried to charge my phone and got nothing. But again... The next morning, it worked fine again... For a little over an hour...then... It quit again. It's a solar panel... Isn't it supposed to sit in the sun and isn't it going to get hot sitting there in the sun? Isn't that what's it's made to do? So why would it quit working when it gets too hot? It's supposed to get hot sitting all day in direct sunlight! I'm buying another solar panel and it won't be this one or from this manufacturer.