Solar Panel, Anker 21W 2-Port USB Portable Solar Charger with Foldable Panel, PowerPort Solar for iPhone 11/Xs/XS Max/XR/X/8/7, iPad Pro/Air/Mini, Galaxy S9/S8/S7/S6, and More

I wondered why my Anker PowerCore 20100 power bank would never charge from this solar charger, but would charge from a wall charger. So I performed some tests and found that if a cloud passes then the 20100 will drop to a trickle charge for the rest of the day. The 20100 dynamically reduces its charging current draw, but does not increase it. For example, if the sun is out the 20100 will charge at 2.0 Amps from this solar charger. If a cloud passes and the solar charger can only produce 0.25 Amps then the 20100 will reduce is current draw to 0.25 Amps (as it should). However when the sun comes back out the 20100 will still only draw 0.25 Amps, even though more than 2 Amps are available. This was verified using both the YZX Studio ZY1266 USB power monitor and the Drok Pocket Digital Multimeter. Anker support said the 20100 power bank was defective. I replaced it with a second one that behaved the same. I tested my older out of production Anker batteries: the Astro 3E also doesn't increase its charge rate, but the Gen 1 Astro E5 does. The E5 immediately responds when the sun comes back out and draws all available current from the solar charger. I again contacted Anker support and asked for a list of batteries that have been tested with and charge properly from the Anker solar charger. Anker could not produce anything so I was on my own. I purchased some other batteries to see what would work. The EasyAcc Monster 26000mAh Power Bank worked properly. Plus this battery has two charging ports so it can connect to both solar output ports and charge at greater than 2.0 Amps when enough sunlight is available. The Anker Astro E7 26800mah Power Bank works perfectly with the Anker solar charger. The RavPower 26800mah Power Bank works properly in almost all conditions with the Anker solar charger. However if the sunlight drops too low and the charger produces close to 0 ma, but then the sun comes out before the solar charger powers off, the RavPower would not charge anymore. None of the other batteries had this particular problem. I also have the ChoeTech 19W SunPower Solar Charger so I tried the RavPower with it and found that the ChoeTech will reset the USB connection within a few seconds of this happening. So the ChoeTech/RavPower combination works fine. But if you use the RavPower with the Anker solar charger you might come back to your battery at the end of the day to find it didn't charge.

Bought this prior to a house boat trip to Lake Powell. Thought it would be better (and quieter) to use a solar charger rather than burn gas on the boat to recharge-use small items like cell phones, battery packs for LED lights and portable speakers. Love this little solar charger. We had sort of 'absolutely ideal' conditions to use it in: high desert with lots of sun almost no shade or clouds -and the solar charger worked great. charged phones from 0 to 91% in just about the same time (or maybe even faster in our situation) than it would have taken to recharge items via an outlet on the boat. My friends had a small dog with them who actually walked straight over the panel (I had the panel laid out on the shore with a couple of phones stashed under it) -other than a few paw prints than wiped away - didn't seem to hurt the panels performance so it's a fairly durable items. don't think it would hold up very well if a human accidentally stepped on it but that's not what it's designed for. It's fairly compact and light for what it is. It might be a little heavier than what I would want to bring with me on say a back packing trip but I wouldn't be bringing so many electronic items on a back [packing trip either. For 'glamp-ing' though- camping where you want some of the comforts of home- this is a fantastic item. I also own 3 separate Anker rechargeable lithium Ion batteries, which work great in conjunction with this charger, but the charger worked great whether we plugged our iPhones, or music players directly into the charger or charged the battery packs then powered devices via the batteries (of use tiny Anker batteries to power fairy light LED strings for soft ambient light in the evenings that do not over power the beautiful stars) Anker PowerCore 10000, One of the Smallest and Lightest 10000mAh External Batteries, Ultra-Compact, High-speed Charging Technology Power Bank for iPhone, Samsung Galaxy and More Anker 21W Dual USB Solar Charger, PowerPort Solar for iPhone 7 / 6s / Plus, iPad Pro / Air 2 / mini, Galaxy S7 / S6 / Edge / Plus, Note 5 / 4, LG, Nexus, HTC and More

Arrived on time and is as described

If you are thinking for a long trek, in mountain or in jungle it would be an excellent product to buy. Hope Anker will plan this product with a power backup too with reduced size and might be lighter version. Otherwise its okay.

Está perfecto para zonas aisladas de conseguir cargar los gadgets. Es muy compacto y fácil de llevar, tiene muy buena eficiencia en la producción energética. Tal vez la única contra, es que se debe tener cuidado de no llevarlo en algun lugar donde pueda ser doblado porque podría romper las celdas fotovoltaicas. Pero si se lo trata como a un iPad o incluso más rudo, lo debe de soportar.

Purchased this for a 6 week camping trip to help charge 2 x 10,000mah batteries for an iphone 8s and a Pixel 2. I wasn't expecting it to keep up with our usage, but it did a fantastic job! Placing it on the top of our tent through the midday sun, or angled towards the sun in the morning/afternoon making sure to always be topping up either of the two backup batteries. Our phone usage was medium/heavy with google maps, photo uploads and Pokemon Go. Both phones would receive a top up charge twice a day from the backup batteries, with those charged throughout the day from the panel. I did not test charging both batteries at the same time, despite 2 x USB. Even with Australian summer sun we found that the charge rate on even 1 port didn't sustain 2.4A which is a shame, but not a surprise for such a small panel. We expected this and so weren't dissapointed, but please keep this in mind if you are purchasing expecting to sustain 2 x 2.4A ports for your charging needs. Take care when charging in full sun, particularly Lithium batteries as they can get hot, try to keep them shaded away from the panel with a short cable (the shorter the better to avoid voltage drop from the panel). Also, invest in a quality cable, the one that came supplied unfortunately had to be replaced after a couple of weeks usage (also expected and so not dissapointed by this) Overall, very pleased with this product and looking forward to using it for future trips off the grid.

What a fantastic thing to have! It's going to sound like I was paid to write this review but I swear I wasn't. I just really love these panels and I'm surprised more folks don't own things like this. Note: these panels do NOT have a built-in battery pack, and that is exactly what I wanted. I wanted the highest amount of panel efficiency per dollar that I could get and I didn't want any of the product weight or surface area being wasted on anything but collecting rays. Combine this with a proven high capacity power bank and you're good to go! That said, I've heard it's generally not recommended to charge your phone directly from the panels as the voltage fluctuations can shorten battery life, and none of my battery packs can charge and discharge at the same time - so keep that in mind. Took this in my carry-on, used it while hiking around Denver and the nearby Rockies. Security didn't make a peep, which was nice (and surprising, considering how stringent they can be around battery packs and electronics). Super light weight at ~400g, akin to slipping an extra novel in your bag. And boy is it useful!! Strap it to your backpack or throw it on the seat/dash of a car for a sunny hike/drive and you'll be charged up all day. It also is just fun / feels really good to be walking around collecting free electricity from the sun. WEIGHT: I'm pretty sure this is the highest efficiency/weight ratio panel set you can buy. I was debating between this and the AUKEY 20W, which also has SunPower panels. It's a little cheaper at $60 and has a handy stand for you to angle the panels towards the sun. However - what made my decision was the weight of the Anker 21W (~400g) vs the Aukey which was double the weight at 800g. An extra 400g is non-trivial - akin to carrying a whole extra Nalgene of water around in your backpack. Thought it was worth it to pay the extra $20 to lug around half the weight - if you think the panels are annoying to carry around, you'll never use them. CHARGING EFFICIENCY: really varies depending on the weather conditions and the angles you have your panels at. Being physically outdoors seems to help alot. If I had one suggestion to Anker it would be to build some kind of adjustable stand into the panels so you can prop them up at an optimal angle to the sun (perpendicular to the rays). I haven't done any rigorous testing but I noticed that I could fill about half of my 6000mAH pack in 1-2 hours in the full midday sun in Denver (the altitude probably helps too), whereas I can leave the panels out the whole day in indirect sun indoors and barely get 1/4 of my bank charged. In any case, they definitely collect enough electricity to be useful - this isn't just a toy. HARDINESS: accidentally left these out on the balcony, on a day that started out as a sunny morning and turned into pouring rain. The panels must have been soaked for 5-6 hours. Was terrified that I had ruined them. Came home to a fully-charged 6000mAH bank, and the panels still worked just fine. Build quality seems very robust. One of the coolest and most useful things I've bought off Amazon. Great stuff from Anker!