A solar panel does not wear out the way a car engine does. It has no bearings to grind and no fluids to leak. What it does is lose a very small amount of output every year, which makes the question of lifespan more a question of how much output you still get, and how long the rest of the system keeps up with it.
Degradation: the slow fade
Panels commonly degrade by about 0.4 to 0.6 percent per year, though individual products vary and you should check the datasheet. After the first year, when some panels show a slightly larger initial drop, the decline is steady and gentle.
An example makes the scale clear. Suppose a panel loses 0.5 percent of its output each year. After 25 years it still delivers roughly 87 to 88 percent of its original output. After 30 years, a little over 85 percent. That is why a system installed today is likely to be useful well into the 2050s, even if the numbers look a little lower by then.
This is also what the performance warranty guarantees. Many manufacturers promise that the panel will still produce a stated share of its rated output at around the 25-year mark. The details differ, so read the exact percentage and the claim process. Our warranty guide explains how to compare them.
What usually fails first
In most home systems the panels outlast the electronics. The inverter works constantly, converting DC to AC through every sunny hour, and its components wear. A typical inverter life is roughly 10 to 15 years, and it is wise to budget for one replacement during the life of the array. Microinverters, which sit behind each panel, are often warrantied for longer, and power optimizers are also part of the picture. The inverter comparison goes through what to expect from each design.
Other parts can need attention.
Wiring, connectors and mounting
Connectors can corrode if poorly sealed, and rooftop wiring can be chewed by animals. A good installer runs cable carefully and uses rated parts. The racking is usually aluminium or stainless and tends to outlast everything else.
The roof underneath
A roof replacement is the most expensive surprise, since panels must be removed and reinstalled. If your shingles have ten years left, consider replacing them before or when the array goes on, an idea covered in the roof suitability checklist.
Monitoring and communications
Some monitoring gateways or apps change over time, so a system can keep producing but stop reporting. It is a nuisance rather than a failure, but it is worth asking how long the vendor supports the monitoring.
Canadian conditions
Panels sold here are certified to recognised standards, which include temperature cycling, humidity, wind and snow load testing, as well as hail impact. Cold does not damage them. The stress that matters is repeated expansion and contraction through freeze and thaw, and that is what the testing aims to simulate. Heavy hail or a fallen branch can still crack glass, which is why insurance and weather ratings matter. The article on hail and extreme weather covers what to check.
Snow, in itself, does not shorten lifespan. Tilted panels shed it, and you should not scrape it off, as that can scratch the surface.
Warranties versus real life
Two kinds of warranty sit on most panels. A product warranty covers defects and often runs 10 to 25 years. A performance warranty covers power output over time and typically runs about 25 years. Add the inverter warranty, which is usually shorter, and the installer’s workmanship warranty, which may be only a few years or considerably longer. A warranty is only as good as the company behind it, so consider how long that company has been trading and whether coverage transfers to a new owner when you sell the house.
Keeping a system healthy
Care is light. Rain handles most cleaning. A look at the array once or twice a year, checking for debris, damaged cables or shading from new tree growth, and a periodic scan of production data will catch most problems. Our maintenance checklist lists the routine tasks.
A sudden drop in production, compared with the same month last year, is the best early warning. If output falls and the weather does not explain it, call the installer.
When a system reaches end of life
After 25 to 30 years or more, you have choices. You can keep a system that still produces, accepting lower output. You can replace the inverter and keep the panels. Or you can remove and replace the whole array if the economics favour it, since newer panels may be more efficient and cheaper per watt.
Recycling infrastructure for solar panels is still maturing. Glass, aluminium frames and some silicon and metals can be recovered, but availability of drop-off and processing varies by region. Ask your installer what take-back or recycling arrangement they offer, and what it costs, before you sign. Do not put panels out with regular trash.
What this means for your decision
Lifespan matters most for payback. A system that pays back in about 10 to 12 years and then keeps producing for another decade or two has a long tail of savings, though the inverter replacement should be in your budget. See the payback article for how to include that cost, and the solar basics hub for more background.
Quick answers
How long do solar panels last in Canada?
Many panels are warrantied to produce a set share of their rated output for around 25 years, and they often keep working beyond that at reduced output.
What fails first on a solar system?
Usually the inverter, which tends to last about 10 to 15 years. Panels themselves have no moving parts and typically age gradually rather than failing suddenly.
Does cold weather shorten solar panel life?
Cold on its own does not meaningfully shorten life. Panels are tested for temperature cycling, hail and snow load, and certified equipment is built for Canadian winters.
Where to verify
Rules and prices change. Confirm current details with the official bodies below.