Short circuit current

Short circuit current

It is calculated only the DC side, is taken as the maximum current that can circulate in the cable. The calculation is different depending on the connection that performs the cable:

Isc in string cable: It is the short circuit current of a single PV module (declared by the manufacturer).

Isc in connection from string to electrical panel: It is equal to the short circuit current of the single module only if the cable itself is protected by a fuse incoming to the electrical panel. In the case of cable is not protected, the short circuit current is the sum of the short circuit current of all strings in parallel minus one.

Isc in connection from electrical panel to electrical panel: You are using the same process of connecting cables between strings and electrical panels.

Isc in connection from electrical panel to Inverter: Consider the MPP tracker to which the cable is connected, the short-circuit current on the cable is the sum of current Isc from the parallel inputs to what is considered.