Top 5 Installation Mistakes to Avoid When Using PV Combiner Boxes

Even the best PV combiner box can’t compensate for a poor installation. Improper setup can lead to safety risks, system inefficiencies, and long-term damage. Here are five frequent mistakes you should avoid:

1. Undersized Wiring

Improper wire sizing causes overheating and voltage drops. Always use appropriately rated cables for DC voltage and current.

2. Skipping Surge Protection

Without SPD, the system is vulnerable to lightning strikes and transient voltages that can destroy inverters or panels.

3. Inadequate Sealing

Poor weatherproofing allows moisture ingress, leading to corrosion and short circuits. Always use IP-rated enclosures with quality gaskets.

4. Overloaded Inputs

Connecting too many strings to one combiner input can cause overheating or fuse failure. Follow the manufacturer’s guidelines strictly.

5. No Grounding

Neglecting proper grounding can create serious safety hazards. Ensure all metallic parts are securely grounded per code.

Conclusion

Understanding and avoiding these mistakes ensures your PV combiner box functions safely and efficiently throughout the lifespan of your solar system.