Troubleshooting and Maintenance: Reading the Curve, Finding the Fault, Keeping It Boring

A small shadow can drag down more than its own area because of bypass diodes and architecture, and winter shadows stretch farther. Ask what time the drop happens, whether it’s worse in winter, and what changed on the property. Then go at that time. Check for self-shading on flat roofs, and for a single module that underperforms regardless of the sun.

Soiling accumulates gradually: dust, pollen, smoke residue, salt, bird droppings, snow. Don’t scrape or pressure-wash; follow the maker’s method. A flat top may be clipping by design, or new curtailment from heat or high neighbourhood grid voltage. Compare strings on the same plane: they should track together.

Then use monitoring comparisons to decide whether the loss is localized or system-wide. Keep telling the truth: if a tree grew, say so; if the array is dirty, say so; if the tariff limits export, say so.

Diagnosing the obvious without guessing, and without selling parts as a reflex, is where you earn trust early. The goal is a system that stays boring, predictable, and profitable for the customer.

Steady and localized points to one string, optimizer, module, breaker or termination. Intermittent and system-wide points to grid conditions, derating, communications, or a protective device opening under load. Most electrical failures are connection failures in disguise; look for heat, compare like with like, then de-energize before you tighten anything.

Ground faults follow weather and water paths; arc-fault codes trigger inspection, never bypassing. Module-level electronics give granularity but many devices, and a "failure" may just be a changed router. After replacing a part, re-check the work and keep the monitoring map true.

Walk the array from the ground first: modules out of plane, shifted clamps, loose trim, unsupported conduit. On the roof, check clamps, rails, attachments and flashing that still looks like flashing. Cracked sealant is a question about why it was doing that job.

Animals chew insulation and nest under arrays: replace damaged conductors and add code- and maker-compatible protection. Then explain what you found in specific, verifiable terms the customer can understand.

Check clearances, labels and stains, then the data: step changes, dropouts, new flat tops, communication gaps. On the roof: clamps, wire management, connectors out of puddles, roof details, soiling. At the ground: fittings, conduit slope, enclosure condition, a thermal scan under load, targeted torque checks.

With storage, check access, ventilation, operating mode and export settings; run a controlled transition test when it is safe to. Update serial numbers, photos and the monitoring map, and use the three-layer explanation: the app, the meter, and the bill.