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Top 5 Positive Customer Reviews for 21w solar panel
Got the full 2A out of the usb @ 5.2v = 10w. I haven't been able to test the DC yet. DC output is 5.5*2.2mm. Unfortunately no 3.0*1.1 plug for my Acer spin 1 and Chromebook so I had do order one seperately.
excellent. tested it in the afternoon sun . no clouds. connected straight to my phone. 1% every 3mins. in less than 15 mins gained 4%. my guess is that I can fully charge 20000mah power bank within 2 days- depends on conditions. good convertion rate.