Signs Animals Are Nesting Under Your Solar Panels

What to Listen and Look For

Solar panels are designed to sit several inches above your roof, creating an air gap that helps keep the panels cool and allows water to drain properly. Unfortunately, that same gap also creates a nearly perfect hiding place for birds, squirrels, mice, and other small animals.

Protected from rain, snow, direct sunlight, and many predators, the space beneath a solar array offers everything wildlife needs to build a nest. Because it’s hidden from view, many homeowners don’t realize animals have moved in until the problem has already caused damage.

The good news is that animals usually leave clues long before major repairs become necessary. By recognizing the early warning signs, you can schedule an inspection before nests lead to damaged wiring, reduced energy production, clogged gutters, or expensive electrical repairs.

If you’ve been wondering whether something might be living under your solar panels, here are the most common signs to watch—and listen—for.

1. You Hear Scratching or Rustling on the Roof

One of the earliest and most obvious warning signs is unusual noise coming from the roof.

Animals moving beneath solar panels often create sounds that are especially noticeable during the quieter parts of the day.

You may hear:

• Scratching

• Rustling

• Scurrying

• Light thumping

• Chirping

• Squeaking

These noises are often most noticeable:

• Early in the morning

• Around sunrise

• In the evening

• Shortly after sunset

Birds may become active as they leave or return to their nests, while squirrels and rodents often move around during cooler parts of the day.

If the sounds seem to come from the same area of your roof repeatedly, there’s a good chance animals are using the space beneath your solar panels as shelter.

2. Birds Constantly Fly Under the Solar Panels

Occasionally seeing a bird land on your roof is perfectly normal.

Seeing birds repeatedly disappear beneath your solar panels is different.

If birds regularly:

• Fly underneath the array

• Enter through the same opening

• Carry nesting material

• Return multiple times each day

they’re likely building or maintaining a nest beneath the panels.

Birds are creatures of habit.

Once they establish a nesting location, they’ll often continue returning until they’re physically prevented from accessing the area.

Repeated activity around the same section of your solar array is one of the strongest indicators that nesting has already begun.

3. You Notice Twigs or Nesting Material

Animals rarely keep their nests perfectly contained.

As birds build nests, materials often fall from beneath the panels.

Watch for:

• Twigs

• Grass

• Leaves

• Feathers

• Pine needles

• Paper

• Plastic

• Other lightweight debris

If these materials regularly appear beneath the same section of your roof, they’re often coming from an active nest hidden beneath the solar array.

Even if the amount seems small, it usually indicates much more material is accumulating out of sight.

4. Bird Droppings Around the Solar Array

Bird droppings are another common sign that birds have made your solar system home.

You may notice droppings:

• On the roof

• On the solar panels

• In gutters

• Along walkways

• Around downspouts

• On vehicles parked nearby

Heavy concentrations of droppings near the solar array often indicate birds are spending significant time on or beneath the panels.

Besides creating a mess, bird droppings can reduce solar production by blocking sunlight from reaching the photovoltaic cells.

If left in place, they can also become more difficult to remove over time.

5. Your Gutters Fill With Debris Faster Than Usual

Bird nests don’t just affect the solar system.

As nesting materials accumulate beneath the panels, wind and rain gradually wash loose debris into your gutters.

You may notice:

• More twigs than usual

• Feathers

• Leaves

• Nest fragments

• Frequent gutter clogs

If your gutters suddenly require more frequent cleaning and the debris appears concentrated below the solar array, animals may be nesting overhead.

6. Your Solar Production Suddenly Drops

Sometimes the first indication of animal activity isn’t visual at all.

Instead, homeowners notice lower solar production.

Rodents frequently chew electrical wiring beneath solar panels.

Damaged wiring can cause:

• Lower energy production

• One underperforming panel

• One inactive string

• Ground faults

• Arc faults

• Intermittent operation

• Inverter error codes

Because the wiring is hidden beneath the array, many homeowners don’t discover the cause until a diagnostic inspection is performed.

If production suddenly drops without obvious weather changes or dirty panels, animal damage should be considered as one possible cause.

7. Your Inverter Displays Unexpected Error Codes

Chewed wiring doesn’t always shut down an entire solar system.

Instead, it often creates electrical faults that trigger warnings from the inverter.

Common examples include:

• Ground Fault

• Arc Fault

• Isolation Fault

• Communication Error

Although these alerts don’t automatically mean animals are responsible, they often justify a closer inspection—especially when combined with bird activity or unusual noises on the roof.

8. You See Squirrels Frequently Running Across the Roof

Squirrels naturally explore rooftops, trees, and utility lines.

If you regularly see squirrels:

• Running across your roof

• Climbing onto the solar panels

• Disappearing beneath the array

• Carrying nesting material

they may already be using the space underneath your solar system.

Unlike birds, squirrels often cause damage by chewing.

Electrical cable insulation is particularly vulnerable.

Addressing the problem early helps prevent more expensive wiring repairs later.

9. You Notice a Burning Smell or Electrical Issues

Although uncommon, severe animal-related wiring damage can eventually create electrical problems.

If damaged wiring develops poor electrical connections, homeowners may notice:

• Burning odors near electrical equipment

• Repeated inverter shutdowns

• Persistent electrical fault codes

• Unexpected system outages

These symptoms should never be ignored.

While many electrical faults have causes unrelated to wildlife, professional diagnosis is important whenever unusual electrical behavior develops.

Why Animal Damage Often Goes Undetected

One of the biggest challenges with rooftop solar systems is that the area beneath the panels isn’t visible from the ground.

Most homeowners never see:

• Bird nests

• Chewed wiring

• Debris buildup

• Rodent activity

As a result, the problem often continues for months before anyone realizes it’s there.

Many service calls begin because homeowners believe they have an inverter problem or failing solar panels.

Only during the diagnostic inspection is the actual cause discovered beneath the array.

What Happens During an Inspection?

If animal activity is suspected, a professional inspection typically includes checking both the visible condition of the system and its electrical performance.

Depending on the situation, technicians may:

• Inspect beneath the solar array where accessible.

• Look for nests and debris.

• Inspect visible wiring.

• Check connectors.

• Review inverter fault history.

• Test system performance.

• Identify any animal-related damage.

This helps determine whether the issue is simply nesting activity or whether repairs are also needed.

Removing the Nest Is Only Part of the Solution

Many homeowners assume removing the nest solves the problem.

Unfortunately, it usually doesn’t.

If animals can still access the space beneath the solar panels, they’re very likely to return.

That’s why the most effective long-term solution combines:

• Removal of existing nesting material.

• Inspection for wiring damage.

• Repair of any damaged electrical components.

• Installation of critter guard around the perimeter of the solar array.

Critter guard is a durable mesh barrier that prevents birds and rodents from getting underneath the panels while maintaining the airflow your solar system needs.

Once installed, it dramatically reduces the chances of animals nesting there again.

Don’t Wait Until Small Problems Become Expensive Repairs

Animals rarely move under solar panels overnight, and the damage they cause usually develops gradually. What begins as a few birds exploring your roof can eventually become a large nest filled with debris, droppings, and wiring damage hidden beneath the array. Because most homeowners can’t easily see underneath their solar panels, the earliest warning signs are often the sounds they hear, the debris they find, or the changes they notice in their system’s performance.

If you’ve heard scratching or chirping on your roof, seen birds repeatedly flying beneath your solar panels, found nesting material or droppings around the array, or noticed an unexplained drop in solar production, it’s worth scheduling a professional inspection before the problem becomes more expensive. Removing existing nests, checking for wiring damage, and installing critter guard is the most effective way to protect your roof, your solar system, and your energy production from future animal-related damage.

Hearing noises under your panels? See our critter guard installation service in Utah County.