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A boost converter (step-up converter) is a DC-to-DC power converter that steps up voltage (while stepping down current) from its input (supply) to its output (load).
This is a big board, that can handle up to 20A current. But it can only do 20A for short peaks and intervals, 12A constant current will work great without fear of overheating the power chips. This unit is great for when you need higher voltage on your output than you can supply via the input.
Please note that the trim pot that is used to adjust the output of the module needs to be turned quite a few times before you can see a change in the output.