In the past, we also tested nine other models; we discuss them further in the Competition section. We tested the most promising models on a smoggy July week in New York City. It produced the most power of the models we tested and offers several standout features—an additional output port, a weatherproof port protector, and an expansive but lightweight array of panels to catch every last ray of sunlight.

But over the course of the day, the BigBlue had the highest cumulative wattage: The BigBlue stood out among the dozens of models we considered in part because it has two 2. Those ratings are based on the assumption that the solar panels are working at full watt capacity, which will rarely happen with any solar charger. Every other model we tested had just two ports. The BigBlue looks attractive, feels sturdy, and is well made with a weatherproof synthetic fabric. The BigBlue is also one of the smallest models we tested when folded up—tied with the Anker charger at 11 by 6.

This size makes the BigBlue a little more cumbersome to use, but the extra surface area is nice for catching every possible ray on a cloudy day.

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To power your gear, the BigBlue charger comes with a 2-foot cable, double the length of the X-Dragon and Eceen cables. The main downside of the BigBlue charger is, as the brand name might suggest, its size. Something to keep in mind, but again, not a dealbreaker. It generated almost as much power as the BigBlue in our testing—leaving the Anker and Eceen chargers in the dust—and like the BigBlue, it has a Velcro flap to keep the panels folded up and protected from scratches when not in use. But the X-Dragon was about 5 watt-hours behind on cumulative output— For reference, you could charge a Galaxy S10 more than a third full with that difference in power.

Combined, the ports top out at 3 amps, or 15 watts, so charging two devices at the same time will slow them both down. An extra flap of fabric lined with Velcro keeps it closed securely when folded, too—a slightly better example of this design than on the BigBlue. Neither factor is a dealbreaker, though.

One of the wonderful things about solar power is how simple it can be. The only care and maintenance most solar panels require is keeping them relatively clean and free of dust.

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A damp cloth should do the trick most of the time. To really max out your power output, you should angle the panels correctly.

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The possibilities are endless, but the products are not. Dizual speaks to more than just green-goers, but to hikers as well. With an integrated hook, this is perfect to hang on the loop of your backpack, allowing you to keep your phone charged in the event of an emergency while out at the camping trail. You get two USB ports, protected by rubber caps to aid in waterproofing. The panel itself comes waterproofed, and includes specific football-style design to help water run off of your device, not simply protect it from leakage. This compact size allows for easy fold-up and storage in a laptop bag , messenger bag or backpack , and retains up to a max You get a charging speed of up to three overall amps in direct sunlight ideal conditions , or about 2.

This comes with a waterproof polyester canvas cover, so everything perhaps except for your phone , is going to be safe. RAV Power put campers and commuters in mind with this one. We personally enjoyed using this on the dash of the car, connecting it to two phones at once. You get energy retention from That keeps more power in your bank, while still properly charging your device.

All in all, RAV hits home with this attractive pricing and premium function. Bringing enough solar power retention capabilities for the entire camping crew? You have dual USB ports for charging multiple mobile devices, or an 18V adapter included to charge your laptop.

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You can leave it in light rain without worrying about damage, and simply house the phones underneath the eight-panel design to shield them from the rain. Four flat panels that fold out, and a power bank — SunJack knew what they were getting themselves into, and absolutely nailed it.



This rugged, portable and weather-resistant solar panel comes with two detachable power banks. Energy is fed into these, giving standard phones up to ten full charges which is pretty insane. Now, this is ideal for camping situations.

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The cold kills batteries very quickly, so I also wanted something with a solar panel I could just hang on my pack to recharge during the day. I ended up trying a higher end 24, mAh one, and I love it. Prices did increase with larger power bank capacity, however. The two most expensive products both hold 24, mAh. Types of Solar Chargers There are a few types of solar phone chargers. While we focused specifically on solar power banks for our evaluations, other products may work just as well for you.



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Folding portable solar panels are another popular solar charger configuration. Because these have larger solar panels, they collect more energy at a time and charge your devices faster. They tend to be bulkier and cannot store energy, so if you need to charge at night, you're out of luck. We chose to feature solar power banks in this round of evaluations because they charge by sunlight or by plugging into a wall outlet, and they're a little more compact. Many have the added bonus of a built-in flashlight as well. Most of the power banks cannot simultaneously solar charge their own batteries and charge your device, or they do so very slowly.

Also, because the batteries on these devices have large capacities, it can take a while to charge them to full, up to 40 hours of strong sun exposure in some cases. They're meant to charge primarily from an outlet, using solar as a backup for emergencies. Even so, the top performers in our tests indicate that you could get a full phone charge from a day in the sun. Solar Panels The amount of sunlight a device can convert into usable energy depends on a few factors.

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One of the most important is the surface area of the solar panels. The more surface area, the more energy. In our test results, every solar power bank with four panels outperformed products with fewer panels. The products we tested all have similarly-sized panels, but larger panels collect more energy. Best Solar Charging Practices Every product we evaluated is meant to be charged primarily from a wall outlet or computer. The solar power banks have high-capacity batteries and would take a long time to fully charge from sunlight alone. When charging via solar, the panels should be placed outside, tilted toward the sun.

Though some products can gather a little energy inside from window-filtered sunlight or even fluorescent lights, they work best in direct sunlight. Each of the panels on the devices we tested can convert A 10,mAh battery takes about 21W to fill, so a single solar panel would need 14 or more hours of direct sunlight to get a full charge. A typical smartphone can get at least two charges out of a power bank.

Depending on your energy company, each kWh from the grid creates up to 1. The X-Dragon 10, mAh solar power bank is a high-capacity lithium polymer battery with four solar panels to keep your phone charged wherever there's sunlight. The Hiluckey solar power bank can keep your devices charged on a budget.