{"id":25886,"date":"2026-01-21T12:30:00","date_gmt":"2026-01-21T17:30:00","guid":{"rendered":"https:\/\/www.ecoticias.com\/en\/?p=25886"},"modified":"2026-01-21T04:35:17","modified_gmt":"2026-01-21T09:35:17","slug":"these-solar-panels-have-been-on-swiss-rooftops-for-more-than-30-years-and-they-are-still-delivering-over-80-of-their-original-output-in-switzerland","status":"publish","type":"post","link":"https:\/\/www.ecoticias.com\/en\/these-solar-panels-have-been-on-swiss-rooftops-for-more-than-30-years-and-they-are-still-delivering-over-80-of-their-original-output-in-switzerland\/25886\/","title":{"rendered":"These solar panels have been on Swiss rooftops for more than 30 years, and they are still delivering over 80% of their original output in Switzerland"},"content":{"rendered":"\n

Solar panels are usually sold with a 25- to 30-year lifespan, which makes a lot of homeowners<\/a> wonder what happens after that. Do they quietly fade out, or can they keep cutting the electric bill long after the warranty ends?<\/p>\n\n\n\n

A new analysis of six solar installations in Switzerland<\/a> suggests the second option is more realistic than many people think. After three decades in the real world, most of the panels still produced more than 80 percent of their original power, which researchers say is a clear signal about what good equipment can deliver.<\/p>\n\n\n\n

What the researchers studied in the real world<\/h2>\n\n\n\n

The work was led by Ebrar \u00d6zkalay at the University of Applied Sciences and Arts of Southern Switzerland<\/a>, using systems installed between 1987 and 1993. The key detail is that the sites used panels from the same general \u201cfamily,\u201d but they were placed in different locations, from lower valleys to higher elevations with cooler conditions.<\/p>\n\n\n\n

Researchers leaned on decades of monitoring data to track how performance changed year by year, then backed that up with lab checks on older modules. In the paper \u201cThree decades, three climates<\/a>: environmental and material impacts on the long-term reliability of photovoltaic modules,\u201d the team reports an average annual performance drop of about 0.24 percent, which is far below the roughly 0.75 to 1 percent per year often cited in past research summaries.<\/p>\n\n\n\n

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Read More: China launches a floating island unlike anything seen before and takes a giant step toward dominating deep-sea research<\/a><\/h3>\n<\/div>\n<\/div><\/div>\n<\/div>\n\n\n\n

What \u201caging\u201d looks like for a solar panel<\/h2>\n\n\n\n

Solar panels<\/a> do not \u201cwear out\u201d like a car engine with moving parts. Instead, aging is usually about slow damage to materials, like the clear plastic layers that seal the solar cells<\/a>, the protective backing, or metal parts that can corrode over time.<\/p>\n\n\n\n

The Swiss team found that heat is a big deal. Lower-altitude systems ran much hotter, in some cases up to about 20 degrees Celsius warmer, and that extra heat sped up breakdown in the encapsulant, the clear material that holds the cells in place and keeps moisture out.<\/p>\n\n\n\n

That breakdown can create chemicals that contribute to corrosion, which then hurts performance. This is where the \u201cbill of materials,\u201d meaning the exact set of materials used inside a panel, becomes crucial, and it helps explain why panels that look similar from the outside can age very differently.<\/p>\n\n\n\n

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Read More: Beneath the lawns in your neighborhood and cornfields lies a gigantic carbon \u201cbank,\u201d and a new study suggests that in some soils, it is emptying ten times faster than previously assumed<\/a><\/h3>\n<\/div>\n<\/div><\/div>\n<\/div>\n\n\n\n

Why this matters for homeowners and the power grid<\/h2>\n\n\n\n

If panels can keep producing strong power beyond 30 years, that changes the math for solar as an investment<\/a>. It can mean more years of savings after the system has already paid for itself, especially when electricity prices<\/a> spike during that sticky summer heat we all know.<\/p>\n\n\n\n

It also matters for planning. Utilities and policymakers often estimate how much clean electricity<\/a> existing solar fleets will produce in the future, and longer-lasting panels can make those forecasts more reliable, for the most part.<\/p>\n\n\n\n

There is also a climate and health angle. The more electricity that comes from solar instead of fossil fuels, the less heat-trapping pollution goes into the air, and the World Health Organization<\/a> links air pollution exposure to millions of premature deaths each year.<\/p>\n\n\n\n

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