How long do solar panels last?

Q: How long do solar panels last?

Typically 25–30 years. Solar panels don’t die on a schedule; they degrade — typically around half a percent of output per year, which is why production warranties guarantee 80-something percent at year 25 rather than a shutoff date. The band describes when replacement starts being worth discussing, not a cliff. The real mid-life event is the inverter: string inverters last 10–15 years and usually need replacing once during the array’s life, while microinverters are warrantied longer but cost more to swap piecemeal. The quiet failure mode isn’t age at all — it’s a fault or a soiled array cutting production for months while nobody looks at the monitoring app.

On this page5 sections

The short answer What shortens or extends its life Warning signs it’s failing What replacement costs Maintenance that extends its life

The short answer

25–30 yearstypical solar panels lifespan

Solar panels don’t die on a schedule; they degrade — typically around half a percent of output per year, which is why production warranties guarantee 80-something percent at year 25 rather than a shutoff date. The band describes when replacement starts being worth discussing, not a cliff. The real mid-life event is the inverter: string inverters last 10–15 years and usually need replacing once during the array’s life, while microinverters are warrantied longer but cost more to swap piecemeal. The quiet failure mode isn’t age at all — it’s a fault or a soiled array cutting production for months while nobody looks at the monitoring app.

What shortens or extends its life

Shortens it

• Hail and extreme heat cycling stressing cells and solder joints• Salt air near the coast corroding frames, racking, and connectors• Hot spots — persistent shade or heavy soiling overheating individual cells• Pigeons and squirrels nesting under the array and chewing wiring• Budget panels with weak encapsulant that delaminates and lets moisture in

Extends it

• An annual rinse and visual once-over — soiling is lost money, not just dirt• Actually opening the monitoring app monthly, so faults get caught in weeks, not seasons• Trimming trees before shade patterns creep onto the array• A quality install: proper flashing, tidy wire management, critter guard where birds are a thing

Warning signs it’s failing

• Production clearly below the same month last year with similar weather• An inverter error light or a monitoring app full of offline panels• Visible cracks, browning, or bubbling delamination in any panel• Breakers tripping, or scorch marks near the inverter and disconnects• Water stains on the ceiling below roof penetrations — a flashing problem wearing a solar costume

What replacement costs

$15,000–$30,000 before incentivesfor a full residential array replacement, scaling with system size; a string inverter alone runs $1,500–$3,000 installed, and that’s the repair most owners actually face. Incentives are a moving target — the federal residential credit ended after 2025, so lean on state and utility programs and get quotes that price the system honestly without them.

Maintenance that extends its life

Rinse the panels once a year

Garden hose from the ground on a cool morning — no pressure washer, no roof-walking. Hire it out on steep roofs.

Check the monitoring app monthly

Compare against the same month last year; a dead optimizer or tripped string shows up here first.

Inspect after major hail

Cracked cells can look fine from the ground — check production data and photograph anything visible for insurance.

Keep shade off the array

A branch that shades one panel can drag down a whole string; trim before it gets there.

A quiet inverter fault costs more than a dirty roof.

Track your solar array in adulting.app with its install date and we’ll schedule the annual rinse and inspection, remind you to check production, and warn you when the inverter — the part that actually fails — ages into its window.

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