For PV systems with an inverter generating capacity of what size, can the maximum dc voltage be documented by a licensed professional electrical engineer?

The maximum direct current (dc) voltage for photovoltaic (PV) systems with an inverter generating capacity of 100 kW or less can indeed be documented by a licensed professional electrical engineer. This provision is particularly important as it allows for flexibility in system design without the need for extensive documentation or additional engineering oversight for larger systems.

When the inverter capacity is 100 kW or less, it is understood that the associated dc voltage levels, including considerations for safety, compatibility, and functionality, can be effectively managed and documented by an electrical engineer. This threshold is significant because it establishes a practical limit at which the complexity and potential risks of higher voltage systems can be mitigated by standard engineering practices.

In contrast, capacities above this limit, such as 150 kW or 200 kW, may require more rigorous standards and detailed engineering analysis to ensure compliance with safety regulations and performance criteria, reflecting the greater complexities which come into play with larger systems. This is why the choice of 100 kW is the correct one, as it establishes a clear boundary where the documentation process can be streamlined by qualified professionals familiar with electrical systems.