Works, that's all. Not sure what Amazon's policy is for false product advertising, but this is clearly not an MPPT controller! After using it alongside a real MPPT controller and comparing the data, it doesn't come close. Less voltage on panels and less on batteries. I have 8 panels and split them into 4 with this controller and 4 with the slightly more expensive MPPT and was hoping it would be about the same but it wasn't. So I tried to compare it with a cheaper PWM and in fact its specs were almost identical. Just buy a cheaper PWM or spend a little more and get a real MPPT controller.
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