Squirrels Under Your Solar Panels? Critter Guards, Cost, and What to Do

If you're hearing scratching, chirping, or scurrying under your solar panels, you already have a critter problem — and it's worth taking seriously. Squirrels, birds, raccoons, and even rats treat the gap under a solar array as prime real estate: it's dry, shaded, warm, and protected from predators. Left alone, they chew wire insulation, build nests that trap heat against your roof, and leave droppings that corrode mounting hardware.

The fix is a critter guard — a mesh barrier installed around the perimeter of your array — and it typically costs $150 to $600 to install professionally, or $75 to $200 in materials if you do it yourself. Compared to the cost of an electrical fire, a full rewiring job, or a warranty claim gone sideways because of rodent damage, it's one of the cheapest insurance policies in residential solar.

Last updated: 2026-07-08

Why Animals Go for the Space Under Solar Panels

Solar panels sit 4 to 8 inches above most composition shingle roofs, mounted on racking that leaves an open gap around the edges. From a squirrel's or bird's point of view, that gap checks every box: it's elevated, sheltered from rain and wind, insulated by the panel above, and mostly inaccessible to cats and dogs. Pigeons and sparrows nest there. Squirrels use it to store food and raise litters. In warmer climates, rats move in for the same reasons they'd nest in an attic.

The problem isn't the shelter itself — it's what the animals do once they're settled in. Squirrels and rats gnaw on wire insulation because their teeth grow continuously and chewing wears them down; solar cable jacketing is an easy target. Bird nests, especially when built from dry grass and twigs, are a fire hazard when they sit directly against warm equipment and junction boxes. Droppings and nesting debris also hold moisture against the roof and racking, accelerating corrosion.

This is common enough that most solar installers now mention it during the sales process, but very few include critter guards as standard — it's usually an upsell you have to ask about.

Signs You Already Have a Critter Problem

You don't need to climb on the roof to check. Watch and listen for:

Scratching or scurrying sounds from the roof, especially at dawn and dusk when squirrels are most active
Visible nesting material poking out from under panel edges — grass, leaves, or insulation fluff
Droppings on the roof or in gutters directly below the array
A drop in system output on your monitoring app that doesn't correlate with weather or shading — chewed wiring can cause intermittent faults or partial string failures
Squirrels or birds repeatedly landing on or near the array rather than just passing through your yard

If your monitoring app is showing unexplained production dips, don't assume it's a hardware defect before checking for animal activity. Chewed connectors and frayed cabling are one of the more common causes of "my system suddenly makes less power" support calls, and they're often mistaken for inverter problems.

What a Critter Guard Actually Is

A critter guard is a rigid mesh panel — usually galvanized steel, aluminum, or heavy-duty PVC-coated wire — that clips or screws onto the racking around the perimeter of your solar array. It closes off the gap between the panels and the roof without blocking airflow, which matters because trapped heat under panels reduces their efficiency.

Good critter guard products share a few features:

Mesh size around 1/2 inch to 1 inch — small enough to keep out squirrels and birds, large enough to not trap debris or restrict airflow
Corrosion-resistant material since it's exposed to weather permanently
Clip-on or clamp mounting that doesn't require drilling new holes into your roof or racking
A UV-stable coating so it doesn't become brittle and crack within a couple of years

Avoid the cheapest chicken-wire products sold generically for gardening — they rust quickly, sag, and often have gaps wide enough for a determined squirrel to push through.

What It Costs

| Approach | Typical Cost | Notes |

|---|---|---|

| DIY materials only | $75–$200 | Mesh rolls, clips, and basic tools for an average-size residential array |

| Professional installation | $150–$600 | Labor plus materials; varies by roof pitch, array size, and access |

| Included with new installation | $0–$300 | Some installers bundle it if you ask before signing the contract |

| Retrofit after animal damage is found | $300–$1,500+ | Includes guard installation plus wire repair or replacement |

The cost swings mainly on two things: how many linear feet of perimeter your array has, and whether a roofer needs to be involved because of pitch or access difficulty. A single-story ranch with a low-pitch roof is a straightforward afternoon job. A steep two-story roof usually means hiring it out.

If animals have already chewed wiring, the guard installation becomes the smaller line item. Rewiring a damaged string, replacing a chewed junction box, or dealing with a moisture-damaged connector can run several hundred dollars on top of the guard itself — which is the real argument for installing one proactively rather than reactively.

DIY vs. Professional Installation

Installing a critter guard yourself is realistic if you're comfortable on a ladder and your roof has a manageable pitch. The process is generally:

Measure the perimeter of your array
Buy mesh rolls and clips sized for your racking system (rail height and panel-to-roof gap vary by manufacturer)
Cut mesh to length and attach it using clips that grip the racking — no drilling required for most modern racking systems
Check that the mesh sits flush to the roofline with no gaps at corners, since animals will find and exploit any opening

Where DIY gets risky is roof pitch and panel proximity to live electrical connections. If your roof pitch is steep, you have multiple roof planes, or you're not confident handling the array edges without disturbing wiring, it's worth paying a professional. Most solar installers and a fair number of handyman services now offer this as a standalone job — you don't need to go back to your original installer if they don't offer it.

If you're getting quotes for a new solar installation and haven't signed a contract yet, this is the easiest time to add critter guards to the scope. EnergySage lets you compare multiple licensed installer quotes side by side, and you can specifically ask each installer whether critter guards are included or available as an add-on — it's a useful negotiating point since the marginal cost to the installer is small when it's bundled into the original racking work.

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Neither of these requires any permanent installation, which makes them a reasonable stopgap purchase even if you never end up needing them for a critter-related repair — they're equally useful for storms, planned outages, or camping.

Preventing the Problem Before It Starts

If you're installing solar for the first time, ask your installer directly whether critter guards are included, and don't accept a vague answer. If you already have a system and haven't had problems yet, a quick visual check twice a year — once in spring when squirrels are nesting and once in fall when they're stockpiling food — is enough to catch early signs before they become an expensive repair.

A few habits that reduce risk regardless of whether you install a guard:

Trim tree branches that overhang or touch the roofline, since they're the main access route for squirrels
Clear leaf litter and debris from the roof and gutters near the array, which attracts nesting material collection
Check your monitoring app periodically for unexplained output drops rather than only checking when the bill arrives
If you spot a nest, have it removed by a professional rather than DIY — disturbing an active nest can push animals further into the wiring in a panic

The Bottom Line

Critter guards aren't a required part of a solar installation, but they should be treated as a near-mandatory one. For $150 to $600, you close off the single most common source of physical damage to residential solar wiring, and you avoid a repair bill that's frequently five to ten times larger once chewed wiring or a compromised junction box is involved. If you're shopping for a new system, ask every installer to quote it as part of the job. If you already have panels and haven't checked, it's worth fifteen minutes with a flashlight and a ladder.

Compare solar installer quotes and ask about critter guards →

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