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40% OFF 5V 2A Solar Panel Power Bank USB Charge Voltage Controller Regulator Module 6V 20V Input US$5.99 US$9.99 View It

Overall:

BG343834161 15/09/2021

Proven with various supply voltages from 3.6V to 15V. It works and gives an output voltage from 2.9V to 4.1V. The voltage at the USB output is not switched off when the voltage drops, which is suggested by the description of the device on the seller's website. Voltages below 6V at the input give the USB output voltages less than 5V. Therefore, the solar panel or other power source that will be used for the converter should be selected so that its voltage does not drop below 6V under current load. There is no indication of the input polarity on the board. The square is the positive pole and the round is the negative pole.

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