Quote:
Originally Posted by Quoth
The electronics to generate 5V from a PV panel to the USB socket is wasteful. A separate solar power-bank (battery and USB A out) is far more useful.
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No, you are wrong again.
Charging a battery with a battery is much more wasteful. Also when the power bank's battery gets lower than a level, stops charging although not empty..
At the end, only a fraction of the panel's energy will go to your device..