DC-side inspection:

• Visual inspection of modules, connectors, homeruns, cable management, and junction boxes.

• Check for damaged insulation, exposed conductors, failed connectors, UV damage, and rodent damage.

• Verify proper routing, support, and strain relief of DC wiring.

Combiner boxes and disconnects:

• Open and inspect for corrosion, moisture, debris, or overheating.

• Torque-check terminations where appropriate.

• Verify fuses, breakers, and disconnects are properly labeled and match design.

Inverter inspection (DC and AC side):

• Visual inspection of inverter cabinets, filters, fans, and heat sinks.

• Check terminations, bus bars, and breaker lugs for signs of heat or corrosion.

• Review error logs and status screens while on-site, noting recurring alarms and trends.

Grounding and bonding:

• Check grounding conductors, ground rods, bonding jumpers, and grounding lugs.

• Verify racks, modules, and equipment enclosures are properly bonded and intact.

Labeling and safety hardware:

• Confirm that required safety labels, arc-flash warnings, and disconnect markings are present and legible.

• Inspect safety switches, e-stops, and access panels for proper operation and condition.

Optional testing (if included in scope):

• String-level IV curve tracing or performance verification.

• Insulation resistance testing on key circuits.

• Spot-check voltage, current, and harmonics at critical points.

Documentation and reporting:

• Provide a detailed checklist of everything inspected.

• Highlight non-conformances, “watch items,” and recommended repairs or upgrades.