NH Solar Panel Warranty Guide 2026

A product (or equipment) warranty covers physical defects — delamination, frame cracking, junction box failure, cell corrosion. Typical term: 12-25 years. A performance warranty guarantees the panel produces a minimum percentage of its rated output — typically 80-92% at year 25 — protecting against excessive degradation. NH homes need to pay close attention to the performance warranty because freeze-thaw cycling and snow loading accelerate micro-crack formation, which reduces output over time. Look for a linear performance warranty that guarantees at least 90% at year 10 and 80% at year 25.

String inverter warranties in NH typically run 10-12 years, with extended warranties available for purchase. Microinverter warranties are 25 years (Enphase IQ8 series). Power optimizer + string inverter combos (SolarEdge) offer 12-year string inverter warranties with 25-year optimizer warranties. For NH homeowners, microinverters are often preferred because the 25-year warranty matches panel life and avoids a likely mid-system inverter replacement — a $2,000-4,000 cost with a string inverter.

Panel manufacturer warranties survive installer bankruptcy — they are direct from Silfab, REC, Hyundai, Q.CELLS, etc. You contact the manufacturer directly. Microinverter warranties (Enphase, AP Systems) are also direct from the manufacturer. The vulnerable warranty is the workmanship warranty — that goes away with the installer. NH does not have a contractor license bond requirement specifically for solar, so recovering costs for faulty workmanship after bankruptcy is difficult. This is why choosing an established, well-capitalized installer matters.

Solar panels sold in NH must be IEC 61215 certified, which includes mechanical load testing. Most panels are rated for 5,400 Pa of static snow load and 2,400 Pa of wind uplift. NH building codes in most zones impose 50-70 psf snow loads — which translates to 2,400-3,360 Pa. Panels designed for NH should comfortably meet these loads. However, ice impact from falling ice off roof edges is a separate matter — that is covered under homeowner insurance, not the panel warranty.

Very few NH installers genuinely offer a 25-year workmanship warranty. Most offer 10 years. Some offer 5. The longest workmanship warranties are typically backed by insurers (like Sunrun's roof guarantee) rather than the installer directly. When an installer claims a 25-year workmanship warranty, ask: "Who underwrites this warranty, and what is the claims process?" A warranty backed by an insurance carrier is far more durable than one backed solely by a small local installer.

For NH specifically, consider three factors: (1) freeze-thaw resistance — Silfab's Canadian manufacturing means their panels are designed for harsh winters; (2) manufacturer financial stability — REC Group and Hyundai are large companies unlikely to disappear; (3) warranty terms — look for 25-year product warranty and linear degradation guarantee of ≤0.4%/year. REC Alpha and Silfab Elite both offer strong NH-appropriate specs. Avoid lesser-known brands with shorter product warranties or non-linear (step-down) performance guarantees.