Solar panels are known for being low-maintenance and long-lasting—but what happens when they’re not in regular use? Whether you’ve paused your system temporarily or moved into a home with inactive panels, you might wonder: Can a solar panel degrade even if it’s just sitting there?
Let’s break down what really happens during periods of inactivity—and how you can keep your solar system in top shape with a few simple maintenance tips.
What Happens When Panels Sit Idle?
Solar panels don’t “turn off” just because you’re not using them. Even when disconnected from the grid or battery system, they’re still exposed to sunlight and weather—factors that can impact performance over time.
Here are some real risks inactive panels can face:
- UV & heat exposure with nowhere to send the energy
- Moisture buildup leading to corrosion or internal damage
- Thermal stress from constant heating and cooling
- Dust and debris accumulation, which blocks sunlight
- Potential cracks or wear from storms, hail, or falling objects
While these issues won’t destroy your panels overnight, they can shorten their lifespan and reduce long-term performance—especially without regular checkups.
How Long Do Solar Panels Last?
Under ideal conditions, high-quality panels degrade at a rate of about 0.5% per year. That means a panel might still operate at 90% efficiency after 20 years. But when neglected or left exposed for extended periods without care, that rate can speed up significantly.
How to Keep Unused Panels in Peak Condition
If your panels are temporarily offline or unused for seasonal reasons, here’s how to protect your investment:
1. Schedule a Maintenance Check
Even when idle, your system should be inspected at least once a year. Our team at Luminosity Solar checks for loose wiring, corrosion, water intrusion, and wear that might otherwise go unnoticed.
2. Clean & Clear the Surface
Leaves, dust, and debris can collect on panels and cause “hot spots” or reduce energy output later. We recommend a safe, professional cleaning—especially before bringing your system back online.
3. Consider Panel Covers
For extended downtime, lightweight panel covers can help reduce exposure to UV rays and physical wear. Just make sure they’re breathable and waterproof—trapping moisture underneath can cause more harm than good.
4. Protect Against Weather Damage
Trim back overhanging branches and secure any loose rooftop items. Panels aren’t invincible, and storms are a leading cause of unexpected damage—even when systems are inactive.
5. Think About Safe Storage (If Needed)
If your panels need to be removed for a remodel or long-term vacancy, professional removal and dry storage is your best bet. Never store panels in damp areas or let them sit face-up in the sun while disconnected.
Rely on Luminosity Solar for Long-Term Care
At Luminosity Solar, we’re here for every stage of your solar journey, from installation to long-term care. If your panels have been offline or underused, we’ll help assess their condition, recommend smart upgrades, and ensure they’re ready to power your home efficiently again.
Don’t let downtime degrade your system. Let’s keep your solar panels strong, storm-ready, and performing for decades.
