Since as a landscape photographer often out in the field camping and backpacking where there is no electrical power, today received from Amazon today for just $24 this modern era 15 watt or ~2.8 amperes at a voltage regulated 5v output with USB-A and USB-C connector portable ruggedized solar charger that weighs a mere 10.6 ounces that folds up to 7.8" by 8.8" by 0.7". P=EI= (2.8*5.0=14.0 watts). Of course in this era, this old tech person has a lot of little toys that don't run by twisting some mechanical crank.
This afternoon my top end Google Pixel 10 PRO smartphone with a large 4870 mahr lithium battery showed its power was at 55%. I placed the solar charger sort of pointing perpendicularly at 3pm to 5pm at sunshine coming through an upstairs bedroom condo window. By time I returned home about 5:30pm, my Pixel was 100% charged that I thought was rather impressive.
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