Does the pv systems need to be part of the study just like the ac electrical equipment in order for the study to be complete for a company ? Is this in 70 E anywhere ?
Well, on general principles, a PV system that does not include any energy storage (batteries) will not be able to contribute any energy greater than the instantaneous output of the system. Or, in other words, the available fault power is no greater than the normal generation power.
A motor load, on the other hand, can throw back more than its normal full load power under some fault conditions.
If the total energy available from the PV system is small compared to the rest of the calculation, it will not be significant. If it is a large-scale PV plant, it will be similar to a utility connection, but with a very strictly limited current.
But if you look at the DC side, before the inverters, it can deliver its full panel array Isc current into an arc or other fault indefinitely without necessarily tripping any OCPD. The resulting DC arc would not be high power, but could deliver a lot of energy because of its long duration. Whether this is enough to require a study, I can not say.
