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This item needs perfect clear-blue sky to produce its maximum. Both USB output PORTS will do the same job as each other --- no need to choose Blue Port over Black Port; they are equal. With mid-day sun on an average early-SPRING day, I was able to obtain 2.3Amps into a load. This 2.3Amps was obtained from just the Blue Port, and also from just the Black Port equally; and also with ``combo`` 1.5Amps load on any one output Port, PLUS 0.8Amps load on the other output Port. This is 11.5 Watts. Although this is a 20 Watts Solar Panel, this is typical and expected for a quality CHEAP Panel. Some Panels just as cheap will not yield close to 11.5Watts. Don't expect miracles for $50 bucks!!! ~~~ You want true 20w usable, spend $100 bucks.
Verified purchase: Yes | Condition: Pre-owned
Excellent product. Easy to carry and use when cycle camping. Good for phone, power pack and ereader.
Verified purchase: Yes | Condition: New
It only works as a charger if its 100% exposed to the sun with out interruption like the idea of strapping it to your back pack going hiking and keeping your phone charged does not really work because you walk from sunny places to shady places and the sun doesn't shine on your back pack only etc etc in fact you will find it will discharge your phone because the charge mode on the phone kicks in and out and that consumes more power then the charger puts in. the only way you can charge from it is uninterrupted sunshine were you have to place the panels in the best possible angle towards the sun so the panels have to be very stationary other wise it doesn't work
Verified purchase: Yes | Condition: New