Compared: Solar panel warranty information for SunPower, LG, Panasonic and Canadian Solar
Individual panel prices
Prices of DIY kits
Installed system prices
Each of these providers are well-known and respected in the solar market, but each offer different products and features for your solar upgrade. In particular, buyers should pay attention to the solar warranties offered by each provider.
Your solar warranty protects your system—and your investment—from defects, performance issues, or other disruptions that affect your solar installation. Every manufacturer offers a standard warranty on their products, but there’s a lot of variance in these contracts across companies.
Make sure you review these details and read all of the fine print before committing to a manufacturer.
Solar warranties come in several varieties:
To illustrate the difference, consider the angle of your solar installation and how it affects performance. If you don’t work with a certified installer who can guarantee your panels get maximum sun exposure throughout the year, your system performance will suffer.
Naturally, meeting a performance guarantee relies on quality equipment, correct installation, and ongoing maintenance. Most manufacturers don’t offer performance guarantees unless you work with a manufacturer-approved vendor for installation and maintenance.
The specifics of each warranty depend on what manufacturer you go with and what warranty types they offer. Most manufacturers offer standard warranties for their products, with some offering extended warranties for an additional fee.
Generally, product warranties cover the basic operation of standard solar equipment, such as panels, inverters, or batteries. There may also be additional protection against inclement weather, such as hail stones or tornado damage included in your solar warranty.
Of course, most providers offer power warranties bundled with their product warranties, so you’ll have some assurance that your panels will perform as they should—at least for a little while. The performance degradation of each panel depends on the manufacturer and the product purchased, so make sure you know the differences going in.
SunPower is unique in the solar market with its comprehensive 25-year power, product, and service warranty. The SunPower warranty covers solar panel power output, protects against manufacturer defects, and even covers service fees like repairs, replacements, or reimbursements of defective panels.
[Related article: Are SunPower the best solar panels for your home?]
Another well-known entity in the solar market, LG offers a 25-year product and power warranty on its solar products, similar to SunPower. LG’s size works to its advantage, here. As a solar leader, the brand features high levels of consumer trust and certainly has the capital to back up its warranty claims.
[Related article: LG solar panels - are they a good choice for your home?]
Panasonic’s solar warranties vary based on product, with most entries coming with a 25-year limited product warranty. They also have a limited power warranty promising that solar panels will retain at least 90.76% of their power output capability across the 25-year warranty timespan.
[Related article: Are Panasonic solar panels the best option?]
Canadian Solar offers a standard 10-year product warranty on its panels with an extended 25-year power warranty. While respectable, this Canadian Solar comes up short compared to the extensive warranties offered by other industry-leading solar manufacturers.
[Related article: Are Candian Solar solar panels right for your home?]
Both “snail trails” and hotspots are relatively common issues to affect solar panels long-term. Though they’re caused by different things, they both represent localized decreases in efficiency that can reduce the total power output of a solar installation.
Unfortunately, these issues often aren’t covered under product warranties. This is where it pays to read the fine print before signing on—all solar warranties have a “limitations and exclusions” rider that details when the manufacturer warranty will not apply. Snail trails and hotspots are often included in these exclusions.
However, if the issues significantly decrease system performance, or if the issues are caused by improper installation, these issues may be protected. Make sure you understand the details of your solar warranty and be aware of these issues.
It’s hard to know what the future will hold, particularly for long-term investments like solar installations. Warranties protect your investment and ensure that your panels work the way they should—do your research and compare your options side-by-side before buying.
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