Docooler Lixada 10W Solar Panel Charger 5V USB Ports for Cell Phone High Effiency Outdoor Activities Lighting Use Portable Ultra Thin Monocrystalline Silicon 10W-Black

* Updated review after using the panel for my northbound John Muir Trail backpacking trip. The panel worked flawlessly when combined with a 15,000 mAh battery. However, I probably could have gone with a 10,000 mAh battery to save some additional weight. Sizing the battery is a risk management decision because there is always uncertainty with the weather and cloud cover. The panel does not do well in cloudy conditions. The panel was strapped on top of the backpack to maximize power collection. The solar panel provided sufficient power to be completely self-sufficient for the entire 240 plus miles/17 day hike. Another advantage of having a solar panel is it reduces the need to charge the battery bank at a resupply point, saving time. The panel kept me on the trail longer and reduced the risk of running out of power. I was able to charge my iPhone and Garmin inReach to 100% every night. Great addition to my backpacking list. Charging Data on August 2021 JMT Hike: 2,250 mAh on a cloudy day to 3,900 mAh on a sunny day. It's quite possible to charge even more considering that some of days the battery charged to 100%. The solar panel was sufficient to power my iPhone 11 (4,352 mAh battery) and Garmin mini InReach (1,250 mAh battery). The iPhone was on power saving mode but on the entire day using roughly half the battery. The inReach was on while hiking in tracking mode that used about half the battery each day. My review was written from a backpacking perspective. Weight is always an issue when hiking and that played an important part in my decision making. The panel weighs around 3.5 ounces by itself. When I added the velcro, cord, and charging cable, the panel system weighed at 3.9 ounces. This panel is slightly heavier than an alternative advertised on Amazon, both will work well. I like this panel because it's really easy to mount on the top of my pack because of the existing holes on each corner. If you are an ounce counter you could trim the panel or go with the alternate panel and drill your own holes in each corner. I have tested this panel on multiple backpacking trips and the panel worked very well. This panel is my choice for backpacking. Major Points * Light - around 3.5 ounces (3.9 ounces with velcro, charging cable, and cord) * Charge will vary depending on how the panel is oriented and available sunlight. I was able to charge around 1,000 mAh on a partially cloudy day and over 3,000 mAh in the winter months. During the JMT hike in August the charge varied from 2,250 mAh on a cloudy day to 3,900 mAh on a sunny day. * Placed velcro on a battery pack and the panel so they can be attached. Attaching the battery to the panel has multiple benefits. The panel and battery are kept together and this allows for a short cord. A short cord equals less power loss (less resistance) and less weight. * Buy a battery pack. Do not use the panel to charge your phone directly. The panel only works in sunlight and the second you walk into the shade your phone won't charge. Attaching directly to your phone will be like plugging your phone into an outlet and unplugging every few minutes. I would not recommend this panel if you are simply connecting directly to your phone. I recommend you buy a battery pack that can withstand the on/off/on/off/on/off sequence that occurs on the trail. Also, having a battery pack provides an extra layer of safety if it's cloudy during your hike. I sized my battery pack for my emergency power needs (inReach) with the plan for the panel to provide the power to keep my phone charged for taking videos, photos, and using a navigation app. * EXTREMELY IMPORTANT: Use a short and high quality charging cable for the battery and your phone. If you use a long and low quality charging cable you will be wasting your time and money with the panel. I tested the charging capability on different cables and there can be a large difference. If the panel has not worked for you, check your cable. Also, the shorter the charging cable the lower the resistance and lighter the weight. I recommend this panel when coupled with a battery pack. The panel is a nice addition to my gear list on backpacking trips that extend beyond just a weekend.

Wasn't told I need a battery

Gente o produto funciona mesmo, com um dia ensolarada demos carga em 4 celulares das pessoas do grupo!! Prático e valioso em um acampamento sem energia elétrica.

Je l'ai apporté quand j'ai fait le kilimandjaro. Plus une batterie externe. Je l'ai donné au guide qui n'avait rien pour recharger son cell. Lui n'avait aucun problème. Moi eventuellement oui lol. C'est moi qui devait lui emprunter! Le guide le prêtait aux porteurs. Et à mon retour je m'en suis racheté pour mon prochain trek (post covid...). C'est léger, fiable quand il fait soleil, plus robuste que ça parait, se glisse facilement dans le sac à dos ou sur le sac à dos ... Et contrairement à une batterie externe n'a pas besoin de prise... juste du soleil ;)

My biggest problem with this product, besides the 'lost in translation' product name, is that it's NOT a 10W panel, it's a 5W panel. I knew this when I purchased it based on the dimensions of the panel. The manufacturer knows this of course but they advertise it as a 10W in an attempt to fool unschooled buyers, which lets face it, is most people. All that stated, as a 5W panel, it's a really nice, compact, and powerful for its size, solar panel which appears to be using Sunpower brand, monocrystalline silicon. It could be a copy but it looks exactly like other Sunpower panels that I own and performs very well for its size. I'm showing 420ma from it in 5:30pm sunlight with the panel facing straight into the sun and about 475ma, flat on the ground with noon day sun. The panel weights 2.7oz or 78 grams and it's about .075" thick through the panel and about .36" thick, front to back, where the usb port is. I have a Ravpower 3350mah 'lipstick' sized battery that I use to charge items like my 6S Plus, Fenix 5, and Olight headlamp. I recharge the Ravpower with the "Do Cooler" since the external charger isn't sensitive to the panel passing in and out of sunlight and shade, like the iphone is. The iphone will stop charging and won't start recharging until it's unplugged and then plugged in again. The external battery automatically starts charging again as soon as the panel sees light again. Obviously, this solar panel could be paired up with a larger external battery but my set-up is designed to be as lightweight as possible for my ultralight backpacking needs. I'm actually quite happy with this solar panel as a 5 watt panel but I'm not going praise this manufacturer when they deliberately mislead buyers. If they revise the product description and start calling it a 5 watt panel, I'll come back and change my review to 5 stars.