Check out wish.com I built a low buck solar charger using a Wish panel and a Wish solar charge controller. Had a new 12v sealed battery left over from an APC uninterruptible power supply that died before I could replace the batteries… The solar charge controller has 2 USB ports,
Have it frankensteined on a table in the back yard. No idea what I will do with it. 
.
The power output of the solar panel is not 20000 watts, nor is the charge controller capable of handling 100 amps.