July 15, 2025

“How long do solar panels and inverters last?”

A question that you need to consider when choosing components for your solar system.

The durability and lifespan of your solar system is an essential factor in the decision-making process. After all, installing solar is a long-term investment, and understanding the longevity of each component will help you make an informed choice.

In this article, we will look at the typical lifespan of solar panels, inverters, and the other components which may be included in your solar system, the factors that can influence their longevity, and some practical ways to maximise their performance over time.

1. How Long Do Solar Panels Last?

Most solar panels are designed to last between 25 and 30 years. But, this doesn’t mean that they suddenly stop working after that point. Rather, their performance may begin to gradually decline with time. Even after 30 years, many panels still continue to generate electricity, just at a reduced capacity.

Solar panels experience a small drop in performance annually, typically around 0.5% to 0.8% per year. By the 25-year mark, you can generally expect your panels to still produce between 80-85% of their original output. This is known as performance degradation and is factored into most manufacturers’ performance warranties.

Most manufacturers offer two types of warranties:

• Performance warranty: Usually 25 years, ensuring a minimum level of output after a set period.

• Product warranty: Typically ranges between 10 to 15 years, though some premium brands offer 20-30 years. This covers defects or material issues.

Read this article to see a comparison of the best solar panels available on the market.

Whilst modern panels are built to last, it’s good to be aware and look out for any signs of deterioration.

Signs of Ageing or Wear:

• A noticeable drop in energy production

• Physical signs such as discolouration, delamination, or microcracks on the panels

• While these signs may appear slowly over time, it’s worth noting that quality panels installed correctly in a moderate climate can remain highly effective for decades.

2. How Long Do Inverters Last?

Inverters are an essential part of any solar system, acting as the brain and converting the direct current (DC) electricity absorbed by your solar panels into usable alternating current (AC) electricity which powers the appliances in your home. Unlike solar panels, inverters typically have a shorter lifespan.

String Inverters:

These are the most common type used in residential systems. On average, string inverters have a lifespan between 10 and 15 years. Because they work continuously to manage power conversion, they are subject to higher electrical and thermal stress than solar panels.

Hybrid Inverters:

These combine a standard inverter with battery management functionality. The have a similar lifespan of 10 to 15 years, but may involve more maintenance due to their added functionality and complexity.

Microinverters and Power Optimisers:

These newer technologies are installed at panel level. Microinverters typically come with a 20-25 year warranty and are designed to last just as long. Power optimisers (used with an inverter) also tend to have longer warranties and improved durability.

Warranty Coverage:

Standard inverter warranties often range from 5 to 12 years, with some manufacturers offering extended warranty options up to 20 years. Because inverters are more likely to need replacement before the panels, it’s worth considering the cost of a future replacement when budgeting for a solar system.

Read this article to see a comparison of the best inverters available on the market.

3. How Long Does Battery Storage Last?

Home battery systems store excess solar energy for use during periods of low daylight. When paired with a home backup power solution like the Huawei SmartGuard, battery storage can keep the lights on during a power outage.

Like inverters, batteries have a shorter lifespan than solar panels.

Most home battery storage systems have a lifespan between 10 and 15 years, depending on usage. Lithium-ion batteries, the most common type used in residential systems, generally offer 4,000 to 6,000 cycles.

Battery capacity diminishes gradually. By year 10, many batteries retain about 70-80% of their original capacity. For this reason, it is essential to choose a reputable installer who uses high-quality equipment with strong warranties to protect your investment.

Warranties typically cover 10 years or a set number of cycles, whichever comes first. It’s important to review both the time and performance-based aspects of battery warranties.

4. How Long Do Optimisers Last?

Optimisers are devices attached to individual solar panels to improve efficiency and allow panel-level monitoring.

Most power optimisers are designed to last 20 to 25 years, aligning closely with the lifespan of the solar panels they support.

Warranties usually range from 20 to 25 years, although actual performance may depend on operating temperatures and system design.

Because optimisers are located on the roof and exposed to heat and weather, selecting models with robust build quality is important for long-term reliability.

5. How Long Do Hot Water Diverters Last?

Hot water diverters, redirect excess solar energy into your immersion heater to heat water.

Most hot water diverters have a lifespan of 10 to 15 years, depending on build quality and electrical load.

Warranties are typically around 5 years, but may be extended by some manufacturers.

6. How Long Do EV Chargers Last?

EV (Electric Vehicle) chargers allow homeowners to use solar energy or grid electricity to charge their electric cars.

Most EV chargers last between 10 and 15 years, depending on frequency of use, environmental conditions, and build quality.

Warranties are generally in the range of 3 to 5 years. Some high-end models may offer extended warranty options.

Outdoor installations should be rated for weather resistance (IP65 or higher), and units with built-in surge protection tend to have better longevity.

7. Factors That Influence Lifespan

Several factors can affect how long your solar panels and inverters last:

• Quality of Equipment: High quality components generally last longer and come with better warranties. It’s worth investing in reliable, well-tested brands even if the upfront cost is higher.

• Installation Quality: Even the best equipment can underperform if not installed correctly. A professional installation ensures secure mounting, and safe, optimised electrical connections.

• Environmental Conditions: Exposure to extreme weather conditions can accelerate wear and tear. For example, heavy snow loads or frequent hailstorms may increase the rate of degradation for solar panels.

• Maintenance and Monitoring: Regular checks help identify issues early. Modern systems often include monitoring software to alert you to performance drops or faults. Simple maintenance, like cleaning the panels (where safe and necessary), can also help keep the system efficient.

8. When to Replace or Upgrade

Inverter Replacement:

It’s common to replace your inverter once during the lifespan of your solar panels.

Battery Replacement:

Batteries generally need replacement every 10 to 15 years, depending on usage and cycle depth. If your battery capacity has dropped significantly or you’re seeing reduced backup performance, it may be time for a new one.

Power Optimiser Replacement:

Though designed to last 20–25 years, power optimisers may occasionally fail. Replacement may be necessary if monitoring tools show a consistent underperformance from a specific panel.

Hot Water Diverter Replacement:

Hot water diverters usually last a decade or more. If your system is no longer heating water effectively from excess solar, or the controller is unresponsive, it may need servicing or replacing.

EV Charger Replacement or Upgrade:

Most EV chargers last 10–15 years, but you may consider upgrading sooner for features like faster charging, solar integration, or smart app control. Replacement may also be needed after repeated exposure to harsh weather conditions.

Panel Replacement or System Expansion:

You might consider upgrading your panels if

• Their performance has significantly degraded

• Your household energy usage has increased

• Newer, more efficient models become cost-effective

Monitoring Tools:

Tracking your system’s performance can help you spot issues early. Most modern systems include app-based monitoring to show real-time output and alert you to any faults across inverters, batteries, panels, optimisers, and other connected components.

9. Tips to Maximise System Life

• Choose reputable brands with proven track records

• Select certified, reputable installers for proper system design and setup

• Monitor your system regularly to catch small issues early

• Keep panels clean, if accessible and safe to do so

• Schedule professional inspections every few years or after severe weather events

Conclusion

Understanding the lifespan of solar panels and inverters is key to planning your investment. While solar panels can last over 30 years, inverters usually require replacement after 15 years. With the right components, professional installation, and regular maintenance, your solar system can provide clean energy for decades.

Whether you’re just exploring solar or preparing to install a system, knowing what to expect in terms of longevity can help you make smart, sustainable decisions for your home.

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