When choosing a solar panel, there are five important factors to consider: warranty, specifications, technology, efficiency, and temperature coefficient.

Warranty is a crucial factor to evaluate. Solar panels typically come with two types of warranties: performance one and product one. The performance warranty guarantees a specific level of power output over a set period, often 25 years. However, it’s essential to note that this document is often considered less valuable since it is rare for panels to underperform significantly. The product warranty, on the other hand, covers defects and malfunctions, making it the more relevant warranty to consider. In the past, budget brands offered around 10-year warranties, while high-end brands provided 25-year ones. However, in recent years, budget brands have closed the gap, making warranty comparisons more nuanced.

Understanding the technical specifications of solar panels can be overwhelming. While there are numerous specifications available, it is not necessary for a typical consumer to comprehend them all. However, it can be helpful to compare key specifications such as power rating, dimensions, weight, and electrical characteristics between different panels to ensure they meet your specific requirements.

Solar panels employ different technologies, including monocrystalline, polycrystalline, half-cut, and shingled. While each technology has its advantages, the performance differences between them are often marginal. Therefore, it is important not to base your decision solely on the technology used and be cautious of sales pitches that overly emphasize one technology over another.

Efficiency is another factor to consider. It refers to a solar panel’s ability to convert sunlight into electricity. Higher efficiency panels generate more power per unit of surface area. However, for most residential installations, the difference in energy production between high-efficiency and standard-efficiency panels might not be significant enough to outweigh other considerations.

Lastly, the temperature coefficient measures how a solar panel’s performance decreases as temperatures rise above the ideal operating range. Panels are less efficient in higher temperatures, and a lower temperature coefficient indicates less power loss. Considering the temperature coefficient is particularly important in regions with hot climates.

By taking these factors into account, you can make an informed decision when choosing a solar panel that suits your specific needs and preferences.