Are the grounding electrode systems for a PV system's DC and AC sides required to be bonded together?

In photovoltaic (PV) systems, the grounding electrode systems for both the DC side and the AC side do not need to be bonded together. This is primarily due to the fact that the two sides operate at different voltage levels and have distinct grounding requirements. The DC side, which deals with the output from the solar panels, and the AC side, which connects to the utility grid, can be grounded separately based on their specific system designs and regulatory requirements.

Grounding for the DC system is primarily concerned with safety and the protection of the solar equipment. On the other hand, the AC side must comply with the National Electrical Code (NEC) regulations, focusing on personnel safety and equipment protection. Each side's grounding system functions to minimize the risk of electrical shock and to ensure equipment operates safely.

Thus, the necessity for bonding these two grounding systems is not a requirement, allowing them to function according to their operational and safety protocols independently. This highlights the diversity in grounding practices needed for different electrical installations, emphasizing that while proper grounding is essential, the methods may vary based on circuit configurations and applicable safety standards.