Most quality solar panels degrade at just 0. 8% per year, meaning they'll still produce about 85% of their original output after 25 years. . Environmental factors cause 70% of solar production issues: Weather, shading, and dirt accumulation are the most common culprits behind reduced solar output, making regular monitoring and maintenance essential for optimal performance. 8% annually: Quality solar panels. . The number of solar panels installed worldwide increases yearly with technological advancements, increasing environmental awareness, and decreasing costs. The panels are independently wired to a common bus bar and then to a victron 100/50 mppt controller. This. . Your power ratio is about 1. 24 so the system will run optimally, especially as your derating factor kicks in over the years. You said Arlington, VA, so maybe 4 good hours per day (???), so maybe 25-30kWh total (???).
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