DC-Ladeverstärker (D050S)

does anyone have experience with DC charging amplifiers (D050S).
Can I use it to increase the voltage or charging current of my solar panels?
I am currently using a panel with 39.9V and 6A.

The DO50S increases the voltage to approx. 50 volts but does not increase the current. In your case it would increase your panel voltage from 39.9 volts to approx. 58 volts but the total current would not be increased.