Solar charger for mobile phones with high-end power hungry

Did the thing now to test in the great sun week,
could my LG G3 charge while I hear music etc.
Went pretty fast, so would appreciate 90% of what the 230V power supply creates, but may have been because of my simultaneous use.
Incidentally, the solar charger makes again more sense when you order these "external battery with USB - connection" charges.
For 33 euros well made and fairly.

The only thing I would think as a manufacturer, the fabric would not black but also in white etc to offer.