Solar project returns are decided by quality and performance choices made early in development, according to a new Task 13 report covered by pv magazine. Titled "Photovoltaic Project Decisions: Quality, Performance, and Economic Value" (T13-36:2026), the study pulled together 19 authors spanning research institutions, independent testing bodies, O&M analytics firms, and project developers, with contributors drawn from Europe, the Americas, and Australia.
A mobile lab tested more than 4,000 modules across 20 projects and five module manufacturers, finding that factory in-line power measurements overstated actual output by up to 4%, according to pv magazine.
The report prices out the two testing routes. Mobile lab work that includes electroluminescence runs roughly EUR 2,000 to EUR 3,000 (USD 2,286 to USD 3,430) per day and covers 100 to 150 modules, pv magazine reported. Stationary laboratory testing costs around EUR 20,000 per day, before transport is added.
A Chilean rooftop case study puts the design-stage payoff in numbers: a 5% yield gain produces roughly 400 additional kilowatt-hours a year for a standard 7.7 kW residential system, worth about USD 88 annually at Chilean electricity prices, according to pv magazine.
Projects without adequate planning tend to hit early failures within the first two years of operation, the report states, and these require expensive specialist intervention that opex budgets never accounted for.
A standard 2% annual soiling loss assumption, applied with no seasonal variation, is common among performance engineers, according to pv magazine. The report says that figure may hold for temperate climates but can cause serious over- or underestimation in drier regions.