Calculate DC and AC cable gauge for PV strings, battery-to-inverter runs and AC output. Get AWG, mm², voltage drop, ampacity and NEC 690 compliance.
Resistivity: Cu 1.724×10⁻⁸ Ω·m, Al 2.82×10⁻⁸ Ω·m at 20°C. NEC ampacity based on 75°C column, copper in conduit.
NEC 690.8 requires ×1.25 for continuous PV current. Always verify with local electrical code.
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