8 panels . 20 volt/8 amp each. 2 strings of 4 in parallel
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What do you mean "PV wire reads?" How did you make that reading? That number doesn't make sense given your description of the panels' circuit.
The controller calculates the voltage where the most power can be produced at the moment. That voltage can and often will be lower than the panel peak voltage spec. That's what "MPP" stands for.
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