Typically indicates suitability for systems with a power rating of 6kW or higher .
| Symptom | Likely Cause | Solution | | :--- | :--- | :--- | | | Moisture in PV Box or damaged SPD. | Open the box; dry with air compressor. Check ground wire. | | One string has 0V | Blown breaker or loose terminal. | Toggle the breaker off/on. Tighten all screws on that channel. | | SPD indicator is Red | Surge has occurred; SPD is sacrificial. | Replace the SPD cartridge (pull out, push in new one). | | Box is hot to touch | Overloaded (>80% of rated current). | Reduce strings or upgrade to larger combiner box. | Pv Box H6 P3
