- Over the last couple of years I bought 4 of those 1.25 watt maintenance S Panels when they went on sale for $10 at Canadian Tire. I have set them up so I can place all four in parallel with the output to an automotive cigar lighter. I haven't done any measurements but I found that it will charge most of my devices - no problem here in Ottawa Canada. As you stated you do need an usb adapter that does provide enough current rating to make the charge time reasonable.
I have used the set-up to charge various GPSr's.
Just giving my input.
John
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