This report has been prepared for the client named on the cover and may not be relied upon by any other party without the written agreement of Report Kit 360. The issue table above records every revision; the latest row is the current issue.

The system operates automatically; the inverters start when the array voltage exceeds the start threshold and shut down at dusk. If generation stops, check the AC isolator, the inverter display for fault codes and the DC isolators in that order. Emergency shutdown: open the AC isolator in the plant room, then the DC isolators at the inverters; the array remains live in daylight. Maintenance: visual inspection and cleaning annually, electrical re-test every two years, thermography every two years or after any fault.

The installation was inspected visually before testing. Tests were carried out in a safe order: AC circuits first, then DC earth continuity and bonding, polarity, string open-circuit voltage, string current, functional tests and finally array insulation resistance.

The installation is tidy and consistent with the design drawings. Non-conformities: the warning label on DC isolator DC-3 is faded and illegible (minor); the gland on combiner box CB-2 is not tightened and the box IP rating is compromised (major, rectified on site); the roof-edge guard rail is missing one post cap (minor). All other inspection items passed.

This annex records an outdoor infrared inspection of the PV modules and balance-of-system components, following the approach of IEC TS 62446-3. Inspection level: detailed.

Light, uniform dust with localised bird droppings on rows 1 and 2 (about 2% of module area). The soiling was not sufficient to affect the thermal results except at module 1-7, which is recorded as a CoA 1 anomaly.

The array was inspected from the roof walkway at a viewing angle of 60° to 80° to the module plane using a FLIR T560 with the 24° lens, emissivity set to 0.85 for glass and reflected temperature measured by the reflector method (31 °C). Irradiance was logged with a reference cell in the plane of the array and remained above 780 W/m² throughout. The inverters were on and the strings loaded. Each module was imaged individually and the combiner boxes were imaged with the covers removed.

Combiner box CB-2, string 4 fuse holder, 28 K above the neighbouring holders at 61 °C. This is a loose or corroded connection and is classified CoA 3 because of the fire risk. The connection was isolated and remade on the day; a repeat image after 30 minutes showed the holder within 2 K of its neighbours. Recommend checking torque on all fuse holders in CB-1 and CB-2 and repeating the thermography in two years.

All six strings passed the open-circuit voltage, current and insulation resistance tests with deviations within 5% and insulation resistance above 160 MΩ. Functional tests passed. Thermography found four anomalies: one CoA 3 (combiner box connection, rectified on site), two CoA 2 (hot cell at 3-14 and an open substring at 5-2, to be replaced) and one CoA 1 (soiling). The estimated annual loss from the listed anomalies is small. The system is fit for continued operation; the next periodic verification is due in two years.

Unless stated otherwise, the next periodic thermographic inspection is recommended in 2 years.

The findings describe the condition observed on the inspection date. Buildings and assets change with time, weather and use; if a decision is to be made more than three months after the inspection date we recommend that the relevant areas are re-inspected.

Typical patterns for crystalline and thin-film modules, summarised from the IEC TS 62446-3 matrix in our own words. ΔT values are at 1000 W/m².