From the perspective of the energy revolution in the world, photovoltaic power generation has become one of the most popular options for the clean energy sources in the world. The sustainability, decreased cost of installation, and long-term energy production stability are among the reasons behind the popularity of photovoltaic power generation systems. The issue that bothers many consumers of this kind of technology is the service life span of the system and its reliability.
On average, the operational life span of a photovoltaic power generation system is 25–30 years. It does not mean that such a system will stop functioning suddenly after this period; rather, its operational capacity will gradually decrease.
1. Life Span of Photovoltaic Power Generation System
A photovoltaic power generation system does not consist of one part only but an entire energy conversion system that comprises several parts, each having varying life spans.
·Solar cells (modules): 25-30 years
·Inverters: 10–15 years
·Mounting structures: 20–30 years
·Cable systems: 20-25 years
All parts have different roles when it comes to the overall life span of the whole system. The solar modules usually provide the performance standard for long periods, whereas inverters and electrical parts provide operational continuity and stability in terms of efficiency.
Provided the system is well designed and maintained, then a PV power generation system can produce around 75%-85% of the initial capacity after 25 years of use.
2. Degradation of Modules in Solar PV Energy Generation
Solar modules serve as the energy conversion component in a photovoltaic system, and their degradation rate directly influences the system’s power generation efficiency.
Major causes of module degradation are:
• Light-induced Degradation (LID)
• Thermal cycling degradation
·UV radiation aging
oPotential Induced Degradation (PID)
These factors influence semiconductors in different ways and slowly decrease their ability to conduct current and convert energy into electricity. The process is faster in the conditions of deserts or tropical zones because of significant temperature fluctuations and high levels of sunlight exposure.
Average annual values of degradation:
oMonocrystalline silicon – 0.4%–0.6% per year
oPolycrystalline silicon – 0.6%–0.8% per year
In practical terms, after 25 years of exploitation, a good quality photovoltaic power generation system will work at the 80% efficiency of its initial capacity. Bifacial and N-type modules are likely to have a lower rate of degradation.
3. Key Component Lifespan of Photovoltaic Power Generation
Inverter
The inverter is a key component in a photovoltaic system, responsible for transforming the direct current (DC) produced by solar panels into alternating current (AC) suitable for household use or grid integration. It is also the most frequently replaced component in a photovoltaic system.
Its typical lifespan is 10–15 years, depending on thermal conditions, load stability, and grid interaction quality.
In most lifecycle scenarios, the inverter will require replacement at least 1–2 times. High temperatures above 45°C, poor ventilation, or continuous high-load operation can significantly shorten its lifespan. Modern string inverters often include smart cooling systems and remote monitoring, which help extend operational stability and reduce unexpected failures.
Mounting Structure
This framework gives mechanical strength to the system and provides stability from the environment in terms of resistance to wind, snow load, and corrosion.
The life of this structure is estimated to be around 20–30 years, subject to material used. Aluminum alloy frameworks are suitable for marine applications, while galvanized steel frameworks have greater load capacity in the areas of heavy snow or high wind conditions.
Well-designed frameworks are able to bear wind speed above 60 m/s and snow load above 1.5 kN/m².
Cable System
It is the job of cables to provide the passage for electricity within the system and yet, cables are not considered at all, but they are crucial to ensure safety and efficiency.
Photovoltaic cables can typically last around 20 to 25 years when they are properly designed with UV resistance, fire-retardant properties, and high-quality insulation, ensuring long-term durability and safe operation in solar power systems.Photovoltaic cables of good quality will have cross-linked polyethylene (XLPE) insulation that increases its heat resistance to 90°C for continuous operations.
4. Facts Impacting Photovoltaic Power Generation System Longevity
The service life of photovoltaic systems is influenced by a wide range of environmental and operating conditions that can affect their long-term performance and durability.
·Environmental conditions: Exposure to high temperature, humidity, salt mist, and dust would affect the process of aging and light transmittances. All of them affect system reliability.
·Maintenance condition: Infrared thermal imaging and electricity testing are important for identifying failures during the early stage. Appropriate maintenance could increase annual output of the system by 3%-10%.
5. Methods for Increasing Lifespan of Photovoltaic Power Generation Systems
A properly maintained power generation system has an ability to work successfully for more than 30 years.
·Regular cleaning of panels: This helps to get rid of dust, dirt and other things that can decrease the efficiency of sunlight absorption up to 5%-15%.
·Annual checking of electric wiring: Helps to check any insulation damages, looseness of connectors or anything else about voltage.
·The application of high-efficiency bifacial photovoltaic modules can boost overall energy output and enhance system performance, while also lessening the proportional impact of degradation per unit of installed capacity.
·Smart control systems management: Provides the possibility to track the performance of the system.
Conclusion
In general, a photovoltaic power generation system usually has a lifespan exceeding 25 years, and with correct system design and operation procedures, it could serve for even 30 years or more. The most durable parts of the system are solar modules, whereas inverters need to be periodically replaced.
For the investor or user, the important issue is not just the lifespan, but the stability of power generation process as well as control of degradation rate and return on investment during this period.
If you have any questions concerning photovoltaic power generation systems and their long-term operation, please contact us for professional technical consultation and assistance.
