The Powerport 21W does it all. It is well made, light, and compact. It can also carry its weight as a charging powerhouse. It’s more efficient when charging one or more devices, and can recover its charge even after being shaded for a few minutes. The panel also works decently well on overcast days, whereas some of the lower wattage panels could not keep a charge going when clouds overhead. A larger watt panel means faster charge times, less interruption, and a more stable supply of power. After trying such a large range of panels, we realized that in this case, the larger the wattage makes a big difference after all. The Anker Powerport 21W is a great all-around panel for a reasonable price.
- great value for its size
- Performs very well when it’s using light to charge devices.
- As enough protection to keep itself safe.
- Has a good design to use it optimally every time you use it
- Pocket too small to hold extra cords and accessories
- Must be in a source of light to charge
Touted as a high-performance machine, Anker’s panels have often been among our winners, earning that spot mostly for their reliable, high-quality manufacturing. They have always produced a well-made, dependable product.
This 21W is a compact, lightweight panel with unmatched efficiency and charging capabilities.
The Anker 21W dual USB has an energy conversion rate of solar power into electricity between 21.5-23.5%. Using 21W from SunPower solar cells, the product provides enough power to charge two USB devices simultaneously. This makes it the perfect charger for iPhone 7, Samsung Galaxy S7/S6/Edge and Plus, Nexus, HTC and more.
Also, the Anker 21W incorporates the fast charging technology that allows it to deliver up to 2.4 amps per USB port under direct sunlight.
Moreover, the simple design of the product makes it the ideal backpack solar charger. The compact size of 11.1 x 6.3 inches and the ultra-thin design of 1.1 inches when folded, offers portability and simplicity, making it suitable for the camper or the adventurous one. Lightweight is also an important property, representing only an additional 14.7oz of weight to your backpack.
The Anker 21W has an incredible durability thanks to its PET polymer faced panels that are sewn into a rugged polyester canvas that provides water-resistant protection as well.
- Industrial-strength PET polymer
- Steel eye-holes to hang on trees or tents
- Dual USB solar charging
- Weight: 14.7 oz
- Dimensions: 11.1 x 6.3 inches
- Efficiency: 21.5-23.5%: