Solar panels are designed to last for many years, with most modern systems expected to generate electricity for up to 30 years. Over time, their electricity output gradually decreases rather than stopping suddenly when a warranty expires. The lifespan of solar panels depends on several factors, including the quality of their construction, how they are installed, and environmental conditions such as weather exposure. While the panels themselves can last 25 to 30 years, other system components, such as the inverter, may need replacing sooner. Old age alone is not a reason to replace solar panels. If they are still in good condition and producing enough electricity for the user’s needs, they can continue to be used even after their expected lifespan. Replacement should only be considered if the panels’ output has dropped significantly or if they are damaged. Upgrading to newer, more efficient panels can increase the electricity generated from the same roof space. Solar panel inverters typically have a shorter lifespan than the panels themselves and are often the first component to need replacement. According to the Energy Saving Trust, inverters usually need replacing after about 12 years. The inverter is responsible for converting the direct current (DC) electricity produced by the panels into the alternating current (AC) used in homes. Solar panel degradation refers to the gradual loss of electricity production as panels age. This decline is caused by exposure to sunlight, temperature changes, and other weather conditions, which affect the materials inside the panels. According to research by the European Commission’s Joint Research Centre, solar panels typically lose about 0.5% of their power each year. After 20 years, a panel should still be producing around 90% of its original output. Most solar panels come with two types of warranties: one covering faults with the panel itself and another guaranteeing its performance over 25 to 30 years.