CJMCU-3108 problem - when I connect the solar panel Vin goes to 0V

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Joined Feb 5, 2020

I am having problems using CJMCU-3108 board.
I solder an 1:20 transformer and I want to use it with a solar panel, my problem is that when I connect the solar panel the voltage of it goes to 0V.
I measure the input resistance of the board and is about 14ohm.
I dont know what I am doing wrong, someone with the same problem has solved it ??