If a PV source circuit assembly is rated for continuous operation at 100 percent, at what percentage of its rating can it be used?

A PV source circuit assembly rated for continuous operation at 100 percent can be utilized at its full rating, which is 100 percent. This means that the assembly is designed and approved to operate continuously at its maximum specified current and voltage without degrading its performance or risking safety.

In electrical systems, continuous operation essentially refers to the capacity for a device to handle its rated load without any period of downtime or reduction in output. For a PV source circuit assembly rated for continuous operation, the equipment has been tested and certified to ensure reliable operation at this level.

Using it at any level above 100 percent would introduce risks of overheating or failure, as the assembly would be expected to conduct more current than it is designed for. Likewise, using it at a lower percentage (such as 75 percent) would not utilize its full capability, which could also lead to underperformance in solar energy generation.

Therefore, the correct answer aligns with the understanding that when an assembly is rated for continuous operation at 100 percent, it is safe and optimal to use it at that full rating.