Yes, sorry, that's what I meant.
For the individual strings, assuming 100', only 2.1%:
This free voltage drop calculator estimates the voltage drop of an electrical circuit based on the wire size, distance, and anticipated load current.
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Let's just assume combiner box to MPPT is 8.2 ft.
1.3% @ 48V (Voltage will be higher most of the time, so this is conservative), 30A
This free voltage drop calculator estimates the voltage drop of an electrical circuit based on the wire size, distance, and anticipated load current.
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I find a voltage drop from the array of 2.1% over 100 ft acceptable.
I find an additional 1.3% voltage drop from the combiner to the MPPT over 8.2 ft acceptable.
If I REALLY cared, I'd get a 8awg MC4 to plug into the combiner box and run to the MPPT to "shorten" the 10awg/30A run to a few inches.