Slightly disappointing. This is expected to give a higher current in full sunlight. As mentioned, there are different versions of this and I have the new one. It seems that the maximum current is about 3.5 amps, which is about 18 watts. It's rated at 28 watts, which should be closer to 5.5 amps. Also, it doesn't charge at least 2 large battery packs that I own. It charges single phones perfectly. Not sure what the problem is.
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