Solar Panel Warranties Explained (Philippines)
TL;DR
A solar system carries three separate warranties: product/materials (roughly 12-25 years), performance/output (roughly 25-30 years, guaranteeing about 87-90% of original output at year 25), and workmanship from your installer (commonly 5-10 years). The product and performance warranties come from the panel manufacturer, not your installer, which is why local dealer support matters more than the number of years printed on a spec sheet.
A solar system doesn’t come with one warranty — it comes with three, and they cover different things. The product warranty (roughly 12-25 years) protects against manufacturing defects. The performance warranty (roughly 25-30 years) guarantees the panels won’t degrade below a set output level, typically 87-90% of original output at year 25. The workmanship warranty (commonly 5-10 years) covers your installer’s labor. Knowing which is which matters, because a claim against one doesn’t mean the others apply.
What does the product (materials) warranty cover?
It covers manufacturing defects — things like delamination, cracked cells, frame corrosion, or a faulty junction box that fails because of how the panel was built, not because of external damage. Tier-1 brands common in the Philippines, like Jinko, LONGi, Canadian Solar, JA Solar, and Trina, typically offer 12-25 years on this coverage, with premium lines sometimes reaching 25-30 years to match their performance warranty. Check our best solar panel brands guide for how these compare.
What does the performance (power output) warranty cover?
It guarantees the panel won’t produce below a specified percentage of its original rated output as it ages. Industry-standard terms guarantee roughly 90% or more of output through the first 10-12 years, stepping down to around 87-90% at year 25, sometimes framed as a small annual degradation rate (commonly 0.4-0.6% per year for tier-1 monocrystalline panels). This is a separate document from the product warranty, and it’s the one that matters most for long-term energy production, since a panel can still be “working” under the product warranty while producing noticeably less power than it used to.
What does the workmanship warranty cover, and who provides it?
This one comes from your installer, not the panel manufacturer, and it covers the quality of the installation itself — mounting, wiring, sealing around roof penetrations, and general labor. It’s commonly 5-10 years, though some installers offer longer. This is also the warranty most likely to matter in the Philippines’ typhoon climate, since a poorly mounted array is a wind-load and leak risk regardless of how good the panels themselves are. Our how to choose a solar installer guide covers what to check before you commit to one.
Warranty comparison at a glance
| Warranty type | Who provides it | Typical length | What it covers |
|---|---|---|---|
| Product/materials | Panel manufacturer | ~12-25 years | Manufacturing defects, physical failure |
| Performance/output | Panel manufacturer | ~25-30 years | Minimum power output over time (~87-90% at year 25) |
| Workmanship | Installer | ~5-10 years | Installation quality, mounting, wiring |
| Inverter | Inverter manufacturer | ~5-12 years | Inverter defects and failure |
What commonly voids these warranties?
The most frequent voiding factors are physical damage from improper mounting, unauthorized repairs or modifications by someone other than an approved technician, and installation by an unlicensed (non-PCAB) contractor — some manufacturers explicitly require licensed installation for the warranty to hold. Damage from causes the policy excludes, like weather events beyond the panel’s rated tolerance or electrical faults from non-compliant wiring, is also commonly excluded from the start rather than something that “voids” coverage after the fact. See our avoiding solar scams guide for the installer red flags that put warranty coverage at risk before you even sign.
Why does local support matter more than the number of years on paper?
Because a warranty is only useful if someone can actually process the claim. Product and performance warranties technically come from the manufacturer, but in practice a claim routes through a local distributor or dealer — so a brand with no established presence in the Philippines can leave a legitimate warranty effectively unenforceable, even years before it expires on paper. This is one more reason tier-1 brands with local distribution tend to be the safer choice over an unfamiliar brand offering a slightly longer warranty on a spec sheet.
Does the inverter carry the same warranty as the panels?
No. Inverters typically carry shorter coverage, often 5-12 years depending on brand and whether it’s a string, hybrid, or microinverter setup, since inverters have more electronic components and statistically fail before the panels do. Many owners end up replacing or servicing the inverter at least once during a system’s 25-30 year panel life — budget for that separately rather than assuming one warranty term covers the whole system.
How do I actually protect my warranty coverage after installation?
Keep your original invoice, the manufacturer’s warranty certificate, and your installer’s contract in one place, and avoid unauthorized repairs — call your installer or the panel distributor first if something looks wrong. Routine upkeep also matters: see our solar panel maintenance guide for the cleaning and inspection habits that keep a system within normal operating condition and avoid disputes over what caused a drop in output.
Frequently asked questions
What are the three types of solar panel warranties?
Product (or materials) warranty covers manufacturing defects, roughly 12-25 years. Performance (or power output) warranty guarantees a minimum output level, roughly 25-30 years, typically around 87-90% of original output at year 25. Workmanship warranty covers the installer's labor, commonly 5-10 years.
Who honors the product and performance warranty if my installer closes down?
The manufacturer, not the installer, in theory — but claims usually still route through a local distributor or dealer, so a panel brand with no established Philippine presence can leave you stuck even if the manufacturer itself is legitimate.
What voids a solar panel warranty?
Common voiding factors include physical damage from improper mounting, unauthorized repairs or modifications, installation by an unlicensed contractor, and damage from causes the warranty excludes, like extreme weather beyond rated limits or improper electrical work.
Does the inverter have the same warranty length as the panels?
No, inverters typically carry shorter warranties, often 5-12 years depending on brand and type, since inverters have more moving electronic components and tend to fail before panels do.
Is a longer warranty always better?
Not by itself — a 25-year warranty from a brand with no local support is worth less than a 12-year warranty from a brand with an established Philippine distributor who can actually process a claim.
How much does actual output drop over 25 years?
Modern tier-1 panels typically degrade to around 87-90% of original rated output by year 25, meaning they still produce the large majority of their original power after a quarter century.