How Long Do Solar Panels Last?
Most solar panels last between 25 and 30 years. However, this doesn’t mean they stop working after three decades. Instead, they slowly lose efficiency. That means they’ll still make electricity, just not as much as when they were new.
Manufacturers typically guarantee that your panels will produce at least 80% of their original output by year 25. This is called the performance warranty. If your panels made 300 watts on day one, they should still produce about 240 watts after 25 years.
Standard Panel Types and Their Lifespans
| Panel Type | Lifespan Range | Output After 25 Years |
| Monocrystalline | 25–30 years | ~80–85% |
| Polycrystalline | 20–25 years | ~75–80% |
| Thin-Film | 10–20 years | ~60–70% |
As you can see, the type of panel matters. But so does how you care for them.
Why Do Solar Panels Degrade Over Time?
Even though solar panels have no moving parts, they face all kinds of weather daily. Over time, sun, wind, heat, cold, and snow all take a toll. So, while your panels are strong, they aren’t invincible.
Here are the top reasons solar panels degrade:
- UV light exposure slowly wears down the outer layer.
- Thermal cycling (heating and cooling) makes the materials expand and shrink.
- Moisture and rain can sneak into small cracks and cause corrosion.
- Hail or heavy snow may crack the glass or shift the mounts.
Because of these factors, most panels lose about 0.5% of their yearly output. Some lose less, and the best brands might only lose 0.3% annually.
Signs Your Solar Panels Are Aging
You won’t need to climb the roof to know something’s wrong. Most of the time, your solar monitoring system or inverter will give you clues. Still, it helps to know what to look for.
Common signs of aging panels:
- Your system produces less power than before, even on sunny days.
- You notice frequent error messages from the inverter.
- You see hot spots or cracked glass from the ground.
- One or more panels are producing far less than the others.
If any of these pop up, it doesn’t mean your system has failed. But it does mean it’s time to take a closer look.
Can You Make Solar Panels Last Longer?
Yes, you can. Many homeowners get 35 years or more from their panels. So, with some care, your system can keep producing long after the warranty runs out.
Here’s how to extend your panel lifespan:
- Clean panels twice yearly to remove dust, leaves, and bird droppings.
- Trim tree branches nearby to reduce shade and avoid scratches.
- Check mounting bolts and wires after storms or high winds.
- Get a pro inspection every 3–5 years to catch hidden issues.
In addition, be sure to monitor system performance regularly. That way, you can catch slowdowns early and fix them before they become expensive.
What Happens After 25–30 Years?
You have choices at the end of a panel’s “official” lifespan. Even if efficiency drops, your panels may still be helpful. So, it’s not always necessary to replace the entire system.
Your options include:
- Keep using the panels at reduced output. Many still work well past their 30s.
- Replace the panels only, using the same inverter and racks (if still in good shape).
- Recycle or donate old panels. Some companies specialize in repurposing them.
Because technology keeps improving, newer panels may offer more power in less space. So, upgrading might make sense if your energy needs increase.
Do All Parts of a Solar System Last This Long?
Not quite. While the panels last 25–30 years, other components have shorter lives.
- Inverters (the device that converts DC to AC) usually last 10–15 years.
- Batteries, if you use them, may last only 5–15 years, depending on type.
- Wiring and mounts can last just as long as the panels with proper care.
Therefore, plan for some replacements along the way. But don’t worry—most of these items are affordable and easy to swap.
Will Your Location Affect Panel Lifespan?
Absolutely. Where you live plays a role in how quickly panels age.
- Hot climates can increase thermal stress, but panels are made to handle heat.
- Snowy areas mean extra weight and ice buildup, but snow also reflects sunlight and helps keep panels cool.
- Coastal zones may see more corrosion due to salty air.
So, while the environment matters, today’s panels are made to survive harsh conditions. Manufacturers test them for extreme weather before sending them out.
Final Thoughts
So, how long do solar panels last? With the proper setup and a little upkeep, they can serve your home for 25 to 30 years—often much longer. Therefore, it’s smart to think of solar as a long game. You pay upfront, but the savings and clean energy benefits remain for decades.
At Impact Energy, we help you understand what affects panel lifespan, spot early signs of wear, and handle basic maintenance—so you enjoy clean energy with fewer headaches. Most importantly, you’ll know exactly when it’s time to upgrade, and when it’s okay to keep things running.
FAQs
Can I use my solar panels after 30 years?
Yes. Even after three decades, many still work at 70–80% of their original output.
What reduces solar panel lifespan the most?
Constant heat, moisture, and intense UV exposure will cause the most wear over time.
How often should I clean my panels?
At least twice a year. However, more frequent cleaning may be needed in dusty or coastal areas.
Will snow damage my panels?
Not usually. Solar panels are tested for snow load. Still, use a roof rake to remove buildup when safe.
Are warranties tied to lifespan?
Yes. Most panels carry a 25-year performance warranty. However, some top brands offer up to 30 years.