What is the maximum series fuse rating for PV?

The maximum series fuse rating for PV (photovoltaic) systems depends on various factors, including the specifications of the PV modules, the wiring configuration, and the overall system design. However, there are some general guidelines to consider:

1. Module Manufacturer Recommendations: PV module manufacturers typically provide guidelines regarding the maximum series fuse rating for their modules. These recommendations are based on the maximum current that the modules can safely handle.

2. NEC Requirements: The National Electrical Code (NEC) provides guidelines for PV system installations, including requirements for overcurrent protection. According to NEC 690.9, the maximum series fuse rating for PV modules shall not exceed the ampacity of the module's conductors or the module's rated current, whichever is less.

3. System Design Considerations: The maximum series fuse rating should be selected based on the maximum current that the wiring and components can safely handle. This includes considerations such as conductor sizing, temperature ratings, and voltage drop.

4. Consultation with a Professional: It's important to consult with a qualified electrician, solar installer, or engineer when determining the maximum series fuse rating for a PV system. They can evaluate the specific requirements of the system and ensure that the fusing meets safety standards and code requirements.

In summary, the maximum series fuse rating for PV systems should be determined based on manufacturer recommendations, NEC requirements, and system design considerations. It's essential to ensure that the fusing is appropriately sized to protect the wiring and components while maintaining safety and reliability.