2.5A Mppt Solar Charging Controller Board Module With 5V/2.1A Usb Output, For Single/Parallel 3.7V-4.2V Batteries 4712989249405
Supports 5V-18V (10W-30W) solar panel input with reverse polarity and backflow protection Charges 3.7V Li-ion 18650 batteries (BMS optional, not...
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