The charging electronics seems to be only the current flow from certain values.
The sun has already popping it directly, so it loads, obviously the color of light has an influence, because in spite of direct radiation not charge took place, or the panel / Electronics has errors?
On this day the sun was directly on the panel, but the light did not look so bright and glistening as usual, and it produced nothing, the day before at the same time and following everything was ok.
And no, that was not during the eclipse, but a few days later.
By comparison, next was a solar charger with 2 cells, each with about 5 watts, which gave super power.
Also this has monocrystalline cell line, albeit with a slightly smaller efficiency.
It also supplies energy on cloudy days, although very little, but a sunless day, after all, about 1500mAh.
The XTPower SP13, however: No proper sun -> No shop.
To be fair, we must say that in ordinary solar power also exists, as mentioned, will be seen during the summer, resulting in the cell plan.
Which can be loaded with 2A charge current a battery that is ever present: Anker Astro E7 Ultra High Capacity 25600mAh 3-Port ()
So to load a few smart phones, headsets, etc., it is sufficient.
There should be only one or multiple battery packs available to (generally better to charge smartphones not directly on the panel) to save energy
