Meteodyn PV

DDS-CAD PV

PV F-CHART

Electrical Grid Shuts Down

Smart MicroGrids

Choosing the Right Batteries for Your Solar System

Fuses in PV Systems

Circuit Breakers in PV Systems

[...]

In this article

Table of contents

**String Fuse (PV Source Output)**- If each module is rated, say at short circuit current of 9A, a conservative design for the PV fuse will have a rating of 1.56x9=14.04 A. (1.56= 1.25 x 1.25, or two margins of 25% each, one in Isc and one in OCPD). The conductor rating should be higher than the fuse rating so that the conductor is protected by the fuse. However, the conductor should be rated to 9x (n-1) A where n is the number parallel strings. Voltage rating of the fuse should be at least 20% higher than the string voltage.**Array Protection Fuse**- The current rating will be n times the short circuit current of one string (same as a module s/c current) where n is the number of strings in parallel forming the array as above.

SERGIO JOSE

on 04 Apr 2019rose

on 29 Oct 2020welleleCOM

on 29 Oct 2020rose

on 07 Apr 2022