Solar insurance and warranty claims

A PV system generates a stream of financial value for decades, which means the risks to that stream — theft, storm damage, fire, a manufacturer going out of business, a component underperforming its stated specification — are also spread over decades. Owners and installers routinely confuse three distinct forms of protection: property insurance, manufacturer product warranty, and manufacturer performance warranty. Each covers a different failure mode, each has different exclusions, and confusing them is the most common reason a claim is refused. This article separates the three, sets out what a reasonable insurance policy should cover, and walks through how a claim actually proceeds in practice.

By the end you should be able to read a warranty document and an insurance policy schedule and identify gaps between them, and you should understand what documentation to keep from day one so that a claim, if it is ever needed, is straightforward rather than contested.

Three different kinds of protection

Property or asset insurance covers physical loss or damage to the installed system from insured perils — typically fire, storm, lightning, theft, and sometimes accidental damage — in the same way a policy might cover a boiler or an extension. It does not care why a module failed to perform; it cares whether a defined insured event occurred and caused physical loss.

Manufacturer product warranty covers defects in materials and workmanship in the physical unit — a module with a cracked cell from manufacture, a delaminating backsheet, a junction box that fails prematurely. It is issued by the manufacturer (or sometimes underwritten by a third party) and is unrelated to the cause of any external event; it responds to a defect, not an accident.

Manufacturer performance warranty (sometimes called a power or linear performance guarantee) is a separate promise about output — commonly that a module will still produce at least a specified percentage of its rated power after a given number of years, for example around 80-87 percent at year 25 for many crystalline silicon modules, following a degradation curve set out in the warranty document. This is a statistical, measured claim about power output, not a promise against physical defects, and it usually requires field measurement to substantiate a shortfall.

What a reasonable insurance policy should cover

A residential PV system is often added as a specified item to an existing buildings or contents policy rather than insured under a standalone product, and many insurers will cover it automatically up to a value threshold if declared. Commercial and ground-mount systems more often carry a standalone policy. Either way, the policy should be checked for:

• Cover against fire, storm, and lightning as a minimum, given the array's roof-mounted, weather-exposed nature.
• Theft cover, which matters particularly for ground-mount and easily accessible systems, and for inverters and cabling that have scrap value.
• Business interruption or loss-of-income cover for commercial installations, which compensates for lost generation revenue during repair, not just the repair cost itself — this is frequently omitted from standard property policies and needs to be added explicitly.
• Public liability cover, particularly relevant for ground-mount and commercial rooftop systems where a structural or fire failure could cause third-party loss.
• Whether the sum insured reflects the reinstatement cost at current prices, not the original purchase price — equipment and labour costs can move in either direction over a policy's life, and under-insurance is a common and avoidable cause of a shortfall at claim time.

What warranties typically exclude

Warranty documents are drafted by manufacturers and reviewed by their legal teams, and the exclusions are where disputes concentrate. Common exclusions across manufacturers include damage caused by installation not performed to the manufacturer's instructions, damage from external events (the domain of insurance, not warranty), unauthorised modification, and — specific to performance warranties — measurement conducted under conditions that do not match the standard test conditions specified in the warranty document, meaning a simple on-site inverter readout is rarely sufficient evidence on its own to substantiate an underperformance claim; a proper measurement typically requires irradiance-corrected output data over a representative period, sometimes gathered by an independent testing body.

Worked example: comparing the discounted value of two warranty offers

A commercial buyer is choosing between Module A with a 12-year product warranty and a 25-year performance warranty guaranteeing 84 percent of rated output at year 25, and Module B, priced 4 percent higher, with a 15-year product warranty and a 30-year performance warranty guaranteeing 87.5 percent at year 30.

Treat the difference in warranty terms as an insurance-like value rather than a marketing feature: estimate the probability-weighted cost of a defect claim falling inside versus outside the product warranty window, and the probability-weighted value of a performance shortfall claim being payable versus not. For a 400 W module costing roughly €140 delivered and installed as part of an array, a three-year-longer product warranty covering, say, a 2 percent per-year risk of a warranty-eligible defect at an average replacement cost of €180 (module plus labour), has an expected discounted value on the order of a few euros per module — modest, but not zero across a 40-module commercial array. The performance warranty gap matters more over a full 25-30 year hold, because the difference between an 84 percent and 87.5 percent floor at year 25-30, multiplied by decades of generation value, can be worth tens to low hundreds of euros per module in discounted terms depending on the electricity price assumption. The exercise is worth doing explicitly rather than treating "longer warranty" as self-evidently better regardless of price.

How a claim actually proceeds

For an insurance claim: notify the insurer promptly, document the damage with photographs before any remedial work, obtain an independent repair quotation if the policy allows it, and retain the original installation invoice and any commissioning certificate, since insurers commonly ask for proof that the system was installed to a competent standard as a condition of cover.

For a product warranty claim: contact the installer first in most cases, since installers are typically the registered point of contact with the distributor or manufacturer and can arrange inspection; retain the original commissioning documentation and serial numbers, since warranty registration is frequently tied to serial number and installation date; and be prepared for a site inspection before any replacement is authorised, particularly for claims outside the first one or two years.

For a performance warranty claim: this is the most demanding of the three. It typically requires a sustained measurement campaign, often 6-12 months of monitored output compared against expected output corrected for measured irradiance and temperature, because a single low-output day proves nothing on its own — weather, soiling, and shading variability dwarf the degradation effect being tested for over a short window. Many owners never pursue a performance warranty claim in practice because assembling this evidence is costly relative to the compensation likely to be recovered, which is itself a reason to weight performance warranty duration less heavily than it might first appear in a purchase decision, and to weight the manufacturer's underlying reliability track record more heavily.

What goes wrong in practice

The most common and costly mistake is discovering, only after a claim is needed, that the installer who registered the warranty has ceased trading, leaving the homeowner to deal directly with an overseas manufacturer with no local point of contact — retaining the manufacturer's own direct contact details and warranty certificate independently of the installer avoids this. A second common issue is under-insurance from failing to update the declared sum insured as installation costs rise, leaving a shortfall at claim time even when the claim itself is accepted. A third is confusing a manufacturer's marketing claim about expected degradation with the actual warranty document's guaranteed floor — the two are not always the same figure, and only the guaranteed floor is enforceable. A fourth is discarding commissioning certificates, datasheets, and serial number records after installation; these are exactly the documents an insurer or manufacturer will ask for, and reconstructing them years later from memory is difficult or impossible.

Standards and references

IEC 61215 specifies design qualification and type approval testing for crystalline silicon PV modules, and passing this testing regime is generally a precondition for a credible manufacturer warranty, though it is a design qualification test, not a guarantee against every field failure mode. IEC 61730 covers PV module safety qualification, addressing fire and electrical safety aspects relevant to both product liability and insurance underwriting.

Frequently asked questions

Does my home insurance automatically cover solar panels?

Many insurers extend cover automatically up to a value threshold once the system is declared, but this varies by insurer and policy, and undeclared systems risk a claim being reduced or refused. Always confirm in writing that the system has been added to the policy schedule rather than assuming implicit cover.

What is the difference between a product warranty and a performance warranty?

A product warranty covers manufacturing defects in the physical component; a performance warranty is a separate promise that the module's power output will not fall below a stated curve over a longer period. A module can be free of manufacturing defects and still fall short of its performance warranty curve, and the two are claimed and evidenced in entirely different ways.

Is it worth pursuing a performance warranty claim?

Only if the shortfall is substantial and sustained, because substantiating a claim typically requires months of irradiance-corrected monitoring data, which has a real cost in time and sometimes in third-party testing fees. For a small, ambiguous shortfall the cost of proof may exceed the likely recovery.

What happens to my warranty if the manufacturer goes out of business?

In most cases the warranty becomes unenforceable or recoverable only through a formal insolvency claims process, which rarely returns meaningful value to individual claimants. This is why manufacturer track record and financial stability are relevant purchase criteria, not just the stated warranty length.

Should ground-mount systems carry different insurance from rooftop systems?

Yes, typically. Ground-mount systems face materially higher theft exposure and different structural and liability risks than rooftop systems, and standalone commercial policies for ground-mount arrays commonly price theft and liability cover as distinct line items rather than folding them into a general buildings policy.

Do inverters carry the same length of warranty as modules?

No, generally not. Inverter warranties are typically shorter, often 5-12 years standard with paid extensions available, reflecting their shorter expected service life relative to modules, as discussed in inverter replacement and lifecycle costs.