Solar O&M contractor — preventive maintenance, cleaning, thermography and performance-ratio reporting

Scope

Scope of work

The O&M contract sets a cleaning schedule for the site's soiling, preventive checks on inverters, structures, cabling and earthing, string-level monitoring with IV-curve and thermography inspections to find under-performing modules and hot joints, and performance-ratio reporting that compares actual generation with what the irradiance should have produced. Breakdown response and spares are defined in the contract.

How it is delivered — and what you receive

Each visit is logged against the schedule with readings, and the monthly report shows the performance ratio, the availability and the losses traced to their cause — soiling, shading, a failed string or an inverter fault — so a decision can be made rather than a number filed. Statutory items such as the earthing test and the inverter protection check are recorded for the periodic inspection. The client receives the maintenance log, the monthly PR report and the fault history.

An industrial rooftop is a harder O&M site than a clean commercial roof, and for reasons that are specific to a working factory. Soiling is heavier and site-specific — process dust, stack discharge, road dust and the neighbour's activity all land on your modules, and the cleaning interval that suits one plant wastes water at another, which is why the schedule is set from measured performance rather than from a calendar. Access is around production, not around the O&M team: shutdowns, hot roofs, live process equipment below and safety clearance all shape when work can actually happen. And the plant sits on a roof that is itself a production asset, so every visit is also an inspection of the mounting and the penetrations — the point where a maintenance contract quietly protects you from a much more expensive problem than lost generation. What the reporting is for is separating the causes: a fall in output is soiling, shading, a failed string or an inverter fault, and only one of those is fixed by cleaning.

Sources and standards

• MNRE ALMM — Approved List of Models and Manufacturers (ALMM) for solar PV modules. Ministry of New and Renewable Energy. Publisher.Which module models and manufacturers are eligible for government-linked and subsidised solar projects.
• IEC 61215 / IEC 61730 — IEC 61215 (design qualification) and IEC 61730 (safety qualification) — photovoltaic modules. International Electrotechnical Commission. Publisher.Module qualification and safety testing.
• IEC 62109 — IEC 62109 — Safety of power converters for use in photovoltaic power systems. International Electrotechnical Commission. Publisher.Inverter safety.
• CEA (Measures relating to Safety and Electric Supply) Regulations (2023 (superseding the 2010 regulations)) — Central Electricity Authority (Measures relating to Safety and Electric Supply) Regulations. Central Electricity Authority. Publisher.Safety requirements for electrical installations, inspection of HT installations before energisation, periodic inspection, earthing and protection.

Standards are cited to support the technical statements on this page. Where a standard has been revised, the edition shown is the one verified at the time of review; the edition in force for a project is the one the authority applies.

Before you ask us to quote: the Solar EPC buyer's guide lists what to have ready, what drives cost and timeline, and the approvals that usually apply.