All solar panels lose performance over time due to physical and chemical changes in the cells and encapsulant. Modern mono-PERC panels degrade at about 0. 5% per year, HJT and TOPCon at 0.
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The market is projected to expand to around USD 671. 0 million by 2035, growing at a compound annual growth rate (CAGR) of 6.
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About 97% of home solar panels quoted in the second half of 2025 produce between 400 and 460 watts, based on thousands of quotes from the EnergySage Marketplace. But wattage alone doesn't tell the whole story.
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Modern panels reach 18–23% efficiency. That means they convert about one-fifth of sunlight into usable power. But efficiency is only part of the story. Real-world performance changes with temperature, shading, tilt angle, and even the quality of the inverter or battery.
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