Size overcurrent protection devices (fuses/breakers) for PV source circuits and output circuits per NEC 690.9.
Input Parameters
Results
--
Max Circuit Current
A
--
Min OCPD Rating
A
--
Standard OCPD Size
A
--
Max Series Fuse (module)
A
Note: Series fuses protect strings from backfeed. Not required if 2 or fewer strings. Max series fuse rating is printed on module nameplate.
Reference
Source Circuit: Max I = Isc x 1.25
Output Circuit: Max I = Isc x Strings x 1.25
Min OCPD = Max I x 1.25 (continuous)
Max Series Fuse = Isc x 2.4 (module rating)
Per NEC 690.9 and 690.8