De-rate calculations

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I have a 4.25kW system with Enphase Micro-Inverters (m215) This inspector wants certain de-rate calculations that are clearly different than the string size tables that Enphase provides. I need help figuring out how to do this ):
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Our wires are between 1/2" - 3" off the roof if that helps. I mean, if anyone understands this and could maybe show me an example i can emulate... That would be great! :)
 
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