Calculate NEC 690 compliant maximum system voltage, current, and conductor sizing for PV systems.
Input Parameters
Results
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NEC Max Voltage
V
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NEC Max Current
A
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Corrected Voc
V
--
Min Conductor Size
AWG
Note: NEC 690.7 requires temperature-corrected Voc. NEC 690.8 applies 125% factor to Isc. Conductor must handle 156% of Isc total.
Reference
Voc_corrected = Voc x (1 + TempCoeff x (25 - T_low))
Max Voltage = Voc_corrected x Modules/String
Max Current = Isc x Strings x 1.25 (NEC 690.8)
Conductor = Max Current x 1.25 (continuous load)