A Guide to the Project Management Body of Knowledge by Pmi Standards Committee

By Pmi Standards Committee

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The shortcircuit current capability of a module is nominally 10 to 15 percent higher than the operating current. Normal, daily values of solar irradiance may exceed the standard test condition of 1000W/m . These increased currents must be considered in the 2 ampacity calculations. Another problem for PV systems is that the conductors may operate at temperatures as high as 65-75°C when the modules are mounted close to a structure, there are no winds, and the ambient temperatures are high. Temperatures in module junction boxes frequently occur within this range.

For the charging and dc-load circuits, it is recommended that a current-limiting fuse be used at the battery with a switch located between the battery and the current-limiting fuse. Circuit breakers can then be used for all other overcurrent devices in down-stream circuits where the available fault currents do not exceed their AIR or where they are protected by a current-limiting fuse. 44 DISCONNECTING MEANS There are many considerations in configuring the disconnect switches for a PV system. The National Electrical Code deals with safety first and other requirements lastif at all.

The output voltage may be reduced to zero by shorting the PV module or array terminals. When this is done, short-circuit current will flow through the shorting conductor, which in a properly wired system with bypass diodes, does no harm. The output current may be reduced to zero by disconnecting the PV system from any load. The PV disconnect switch would accomplish this action, but open-circuit voltages would still be present on the array wiring and in the disconnect box. On a large system, 100 amps of short-circuit current (with a shorted array) can be as difficult to handle as an open-circuit voltage of 600 volts.

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