Quick Answer
When purchasing solar panels, it's crucial to understand the fine print in warranties, which often includes details about degradation rates, power output guarantees, and repair or replacement terms. Reviewing these details can help you make an informed decision and avoid costly surprises down the line. Manufacturer warranties typically last 25 years or more.
Understanding Degradation Rates
Solar panel degradation refers to the loss of power output over time, typically due to environmental factors like UV radiation, temperature fluctuations, and moisture exposure. Most solar panels degrade at a rate of around 0.5% to 0.8% per year, depending on the manufacturer and quality of the panels. For example, a high-quality panel with a 25-year warranty might maintain 90% of its original power output after 10 years, 85% after 15 years, and 80% after 20 years. When reviewing warranties, look for specific degradation rates and power output guarantees to ensure you’re getting the expected performance from your solar panels.
Evaluating Power Output Guarantees
Power output guarantees are essential in solar panel warranties, as they ensure that the panels will maintain a certain level of performance over time. These guarantees often specify a minimum power output in watts per panel, and some manufacturers may offer tiered guarantees based on the panel’s age. For instance, a manufacturer might guarantee 95% of the original power output for the first 10 years, 90% for the next 5 years, and 85% for the remaining 10 years. When reviewing these guarantees, consider the specific numbers and how they align with your energy needs and expectations.
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