When evaluating solar panel opportunities, you may notice that most solar panels are warrantied or guaranteed for 80% efficiency over 25 years. The reason for this is because, like most electrical systems, solar panels age over time. Solar panels can slowly lose efficiency due to aging components, micro-damage and adverse conditions being outdoors.
The good news is that solar panels are very durable and you can also improve the long-term performance of your solar panels with good maintenance.
What Is the Solar Panel Degradation Rate?
The average solar panel loses about 0.5% efficiency each year. This is known as the degradation rate. However, different panel designs, weather conditions and maintenance routines can affect the degradation rate of your panels.
Harsh weather and poor maintenance, naturally, can increase the degradation rate. Mild weather and attentive maintenance can both decrease the degradation rate. Good maintenance is also the best way to get performance from your panels in regions that experience harsh weather.
Factors Contributing to Solar Degradation
There are three major factors that can influence the rate that your solar panels lose or maintain their efficiency.
Exposure to UV Light
UV light can be harmful to solar panels and the electrical components that make up your solar panel system. Fortunately, most solar manufacturers also treat their panels with UV blockers to prevent the majority of potential damage.
Weather Conditions
Some regions have more challenging weather than others. From tropical hurricanes to heavy snow storms, your local weather conditions can impact the longevity of your solar panels.
Temperature Fluctuations
Extreme heat and extreme cold can impact the performance of your solar panels. Sudden changes in temperature can also be challenging. Good temperature regulation in the attic can help for panels installed directly on the roof surface.
Efficiency by Solar Panel Type
- Monocrystalline Panels – 0.2% to 0.5% degradation rate – better heat resistance
- Polycrystalline Panels – 0.5% to 0.7% degradation rate
- Thin-Film Panels – 1% to 5% degradation rate – rapid degradation
- Bifacial Panels – 0.25% to 0.35% degradation rate – good at high altitudes
Maintenance Tips To Minimize Efficiency Loss
How can you increase the durability of your solar panels to minimize the efficiency loss and maximize your long-term power generation? First, clean your solar panels regularly. Efficiency can be lost temporarily yet continuously if dirt and debris are on the panel surface. It’s also important to have your panels inspected once a year. Take care of any little repairs that are needed to catch problems early before they cause a higher degradation rate.
Optimize Your Solar Panel Installation With Solar Optimum
Any major electronic system will degrade over time. The question is how fast. With attentive care and regular inspections, your panels could last longer and give better performance compared to the average degradation rate. Solar Optimum provides durable panels, backed by industry-leading warranties. Contact us to get a free solar panel estimate or download our Ultimate Guide to Going Solar.
