Originally posted by Rainwulf
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PS: solar panels do not put out more voltage as the incoming light increases, they put out more current.
That limited current at roughly the same voltage is why MPPT controllers make sense and why simple buck converters may not.
With a constant voltage out the fans are going to try to pull a constant amount of power regardless of how much sunlight is hitting the panels. If they want more than the panels can produce, it is likely that the panel voltage will drop, causing the converter to drop out of regulation or shut down.
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