What a Solar System Looks Like After 10 Years
If you had solar panels installed roughly ten years ago, you've experienced a long stretch of what they were designed to do: quietly produce electricity in the background, with minimal intervention on your part. That's the promise of solar, and for most homeowners, it largely holds up.
But a ten-year-old system is also at an age where a few things are worth taking stock of — not because something is necessarily wrong, but because the system has passed through a meaningful portion of its design life.
Gradual Panel Degradation
Solar panels degrade over time — they produce slightly less energy each year than the year before. This is a well-understood and expected characteristic of photovoltaic technology, and manufacturers design their products to degrade slowly.
For a system installed a decade ago, cumulative degradation is real but modest if the panels are performing to specification. What this means practically: your system is likely producing somewhat less than it did in year one. The question is whether that reduction is within the expected range or whether it's steeper — which could indicate a specific issue with individual panels.
If you've kept monitoring data from the early years of your system, comparing your current clear-day production against that baseline (adjusted for season and sun hours) gives you a useful picture. A significant step-down that doesn't track with expected gradual degradation is worth investigating.
Inverter Lifespan
Inverters are typically the component with the shortest expected service life in a solar system. For many string inverters installed ten years ago, you're potentially approaching or within the typical range of when inverter replacement becomes a realistic possibility.
Some inverters from that era are still performing well; others have already been replaced. The monitoring data is your first indicator: consistent production with no fault codes is a good sign. Error codes, particularly recurring ones, or unexplained production drops that persist after clearing the error, are signals that the inverter warrants professional attention.
If your inverter is original and approaching the end of its expected service life, knowing that ahead of time allows you to plan a replacement proactively rather than reactively. An inverter that fails mid-season means lost production until it's replaced; planning a replacement during a convenient window avoids that.
Monitoring System Changes
This is a practical issue many homeowners in this situation have encountered: the monitoring platform their installer provided has changed, been acquired, or in some cases gone offline entirely. Some homeowners with decade-old systems discover their monitoring app no longer works or shows outdated data.
If you've lost visibility into your system's production, this is worth addressing. Monitoring data is how you catch problems early — without it, you may not notice a gradual decline or a specific panel underperforming until your electricity bills change noticeably. A solar service technician can assess what monitoring options are currently available for your inverter type and help restore visibility.
Wiring and Connections After a Decade
Electrical connections can loosen over time due to thermal cycling — the expansion and contraction that happens with heating and cooling through thousands of days. Roof penetrations where conduit enters the attic can develop minor weathering. Mounting hardware can experience some settling after years of wind loading.
None of this is typically dramatic — solar systems are designed to be durable — but a professional inspection after ten years provides a fresh set of eyes on everything. Catching a slightly loosened connection or a conduit seal that's beginning to crack is far less disruptive than waiting for those to become real problems.
What a 10-Year Review Looks Like
A professional service visit on a decade-old system typically covers:
- Production performance review against historical data and expected degradation curves
- Inverter health check, including error history
- Visual and physical inspection of mounting hardware and conduit
- Connection inspection at accessible junction points
- Monitoring system status and recommendations if the current solution has changed
- Roof condition assessment around penetrations
When It Makes Sense to Call
Even if everything seems fine, if your system is approaching or past the ten-year mark and hasn't had a professional checkup in several years, scheduling one is reasonable preventive maintenance. If you're noticing production that seems lower than it should be, or if your monitoring is showing errors or gaps, that's a more urgent reason to call.
Ready to Schedule a System Review?
If your solar system is getting up in years and you want a professional assessment of where things stand, request a solar service quote and we can schedule a thorough evaluation.