PV Combiner Box Installation: Step-by-Step Guide for Installers

A properly installed PV combiner box is vital for solar array safety and performance. Follow these steps for a professional and safe installation.

Step 1: Site Preparation

Choose a shaded, accessible location near the solar panel strings. Secure a weatherproof mounting surface.

Step 2: Mount the Combiner Box

Use corrosion-resistant fasteners to fix the box securely. Ensure it’s level and grounded according to NEC codes.

Step 3: Connect Solar Strings

Insert each string’s positive and negative conductors into their assigned fuse holders. Tighten all connections securely.

Step 4: Connect to the Inverter

Route the combined DC output cables from the combiner box to the inverter. Label each cable for future maintenance.

Step 5: Test and Verify

Check polarity, voltage, and current using a multimeter. Ensure proper fuse placement and SPD functionality.

Conclusion

Following these installation steps helps ensure your PV combiner box performs safely and reliably for years to come.