Once the device readings hit zero, we opened them up again and waited for them to return to full power. Using the same setup, we waited for the power meters to reach at least a few watts, and then folded the chargers shut. Consistent power: On a different sunny day, we tested whether each solar charger could return to full power after being shaded-imitating, say, a cloud passing overhead.Those numbers helped us understand just how charged a standard phone or tablet would be when left out for the same amount of time. When the test was complete, we also drained each power bank using four Drok load testers to double check that our results were accurate. We monitored the cumulative power production with a PortaPow power monitor attached between each solar charger and power bank. Total power: We also set all of our candidates up for a four-hour period in the middle of the day so that each could charge a fully drained Anker PowerCore 20100 power bank.Making sure the panels were facing the same direction and set up at the same angle, we plugged each one into a PortaPow 3-20V Dual USB Power Monitor and a Drok DC 3-21V Load Tester to find out just how much power they could produce during the sunniest part of the day. Maximum output/fastest charge: We set out the panels just before solar noon, which is when the sun reaches its highest point in the sky at a given location.For more details, see our BioLite SolarPanel10+ review. But if you're going to be off-grid for a long time, it does provide a practical way to keep your devices juiced up without going near a power socket. And by itself, it won't even give your smartphone a full charge. Plus that battery, as you might have guessed, can be charged up from sunlight itself.Īt just 3,200 mAh, though, it's the smallest on our list. If you don't have blue skies and all day to spare, you can also use the onboard 3,200 mAh battery to charge your devices directly. ![]() It works more effectively when aimed directly at the Sun, so there's a small sundial on the BioLite SolarPanel10+ to help you do that. ![]() The BioLite SolarPanel10+ can be used to charge your laptop, smartphone or power bank directly from sunlight: our reviewer found it took six hours to put an 80% charge into a 10,000mAh portable battery. And at time of writing, it was the cheapest option on this entire list. It also comes with an LED flashlight with three modes: lighting, flashing and SOS. On the plus side, this is a great power bank for outdoors, as it's IP66 rain-proof, dust-proof, shock-proof and splash-proof. It is highly recommend you fully charge via wall charger on first use." So that's us told, then. In their own words: "Solar charging is for emergency use, do not take solar power as a primary charging source. That said, the makers warn that you should not depend on this. And then there's the added benefit of being able to top up your charger through solar energy. There's a generous 36,000mAh battery on board, which should be enough to charge an iPhone XS (opens in new tab) for seven times, Samsung Galaxy S10 (opens in new tab) five times, an iPad Pro (opens in new tab) twice, and a Huawei P30 up to five times. ![]() Or you can use everything at once, and charge four devices simultaneously. Alternatively, you can make a wired connection to any of three ports (one USB-C and two USB-A). ![]() You can juice up any device that supports Qi charging simply by placing it on the power bank. If you want wireless charging from your solar power bank, try this option from DJRoll.
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