I've been trying to find the cheapest solar charge controllers the internet can provide for a little while. In previous videos I've been able to recommend some really cheap PWM solar charge controllers but the cheap MPPT versions have been fake. This time however I think I may have come across something which could be classed as Maximum Power Point Tracking.

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CN3722 Lithium MPPT Charge Controller: https://ebay.us/mTXQBE

CN3722 Datasheet: http://admw.uk/j5

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