What warranties are typically offered with home solar panels and inverters?

Understanding Solar Panel and Inverter Warranties

Adding solar panels is a significant investment. Knowing what warranties protect that investment gives you confidence and clarity. Most residential solar systems come with three main warranty layers: the equipment warranty for the panels, the equipment warranty for the inverter, and the workmanship warranty from the installer. Each serves a different purpose and has a different duration.

Solar Panel Equipment and Performance Warranties

Panels typically carry two distinct warranties. The first is a product warranty covering defects in materials and manufacturing. This usually lasts 10 to 12 years, though some premium manufacturers offer 25 years. It covers issues like delamination, corrosion, or faulty wiring.

The second is a performance (or power output) warranty, almost always for 25 years. This guarantees the panel will produce a certain percentage of its original rated power output over time. Industry-standard terms are that panels will produce at least 90% of their rated capacity after 10 years and at least 80% after 25 years. Degradation beyond these limits should qualify for a claim.

Inverter Warranties: String vs. Microinverters

Inverters convert the DC power your panels generate into AC power your home can use. The warranty depends heavily on the technology:

• String (central) inverters: Typically carry a standard warranty of 5 to 10 years. Extended warranty options are often available for purchase, pushing coverage to 15 or 20 years. String inverters are located in a single, accessible location, making replacement relatively straightforward.
• Microinverters: These are installed under each panel. They usually come with a 20 to 25 year warranty, matching the panel performance period. Because they are exposed to higher rooftop temperatures, claims can occur, but the longer coverage period is standard.

Note that inverter warranties often have specific fine print. Look for provisions about whether labor for replacement is included. Many standard warranties cover hardware replacement but not the labor cost for a technician to swap the unit.

Installer Workmanship and Roof Penetration Warranties

Beyond the equipment, the installer provides a workmanship warranty covering the quality of the installation. This is separate from the manufacturer's warranty. Typical durations range from 1 to 10 years. If a wire connection loosens, a racking system shifts, or a roof penetration leaks due to improper sealing, this warranty is what you rely on.

A critical related factor is the roof penetration warranty. When panels are mounted, holes are drilled into your roof. Reputable installers should warrant their roof seals against leaks for at least 10 years. Always ask for this specific coverage in writing. It is separate from your general homeowner's insurance or roofing warranty.

What is Typically Not Covered

Warranties exclude certain situations. Common exclusions include:

• Damage from natural disasters (hail, wind, lightning).
• Damage from animals (squirrels chewing wiring).
• Acts of vandalism or theft.
• Damage from improper maintenance or cleaning by the homeowner.
• Software or monitoring system glitches (these are often covered by separate service agreements).

Key Actions Before Signing

To get the full value from your solar warranty:

1. Read the full documentation. Do not rely solely on the sales summary. Request the actual warranty certificate for both the panels and the inverter.
2. Confirm transferability. If you sell your home, you will want a warranty that transfers to the new owner. Most premium warranties are transferable, sometimes for a small fee.
3. Clarify labor coverage. Ask specifically what labor costs the installer covers under their workmanship warranty and whether the manufacturer's warranty includes labor for inverter replacement.
4. Keep records. Save all warranty documents, the original contract, and the final inspection report. Take photos of the installation and serial numbers.

Warranty terms vary by manufacturer and installer. Always compare these details as part of your overall solar evaluation. Local building codes and climate conditions may also influence which warranties offer the most practical value for your home.