Top Positive Review for Step Down Module on Banggood USA|Shopping USA

25% OFF MPPT Solar Panel Controller 5A DC-DC Step Down CC/CV Charging Module Display LED US$11.99 US$15.99 View It

Overall:

RobbieH 01/11/2020

Very good for the price. However, all is not well. No instructions, no schematic, no nothing nohow. One trimpot is labelled "LED", I assume that it is the threshold current for when the LED goes between red and green. There is a pushbutton labbeld "I/P" which sort of follows the output current, and an unknown possbly power? Another trimpot is labelled MPPT which is Max Power Point for solar panels but no description (MPPT should be done in software, no adjustments). Finally, there is no protection on the XL4018 regulator. The data sheet for that device says abs max in-out is -0.3V, so any sort of load on the input will destroy it (voice of experience). To be fair, they say "The module's current detection is low-end detection. Please do not short the input negative and output negative directly with wire." which does not mention destroying the module. Put a diode in series with the input!

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