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Why Two #2 Cables
A couple of folks asked why I was using two #2 cables for my run from the roof to the basement. The run will end up being 25 feet.
A #2 AWG cable has a 33.6mm cross sectional area. Two #2 AWG cables would equal 67.2 MM cross sectional area. A 2/0 AWG cable has 67.4mm cross sectional area close to the two #2 AWG cables I’m installing.
Using a minimum conductor size calculator, Copper at 20 feet in a DC circuit at 12 volts with 90 amps requires a 2/0 copper conductor. With the 1200 watts of solar on the roof I don’t think I will capture the entire 100 amps so two # 2 AWG cables should be adequate for this install. Please if my math or assumptions are off let me know. The PDF is a drawing of the system I'm installing
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