Hearing Scratching Under Your Solar Panels? Here's What It Can Mean

You are lying in bed and there it is again — a scratchy scrambling sound from the roof, right where the solar panels are. Scratching sounds over a solar array are one of the most common reasons Connecticut homeowners call us, and the good news is the noise itself is diagnostic: what you hear, and when you hear it, usually tells you what has moved in.

What’s making that noise?

Most often, squirrels or nesting birds — the two animals that most frequently colonize the sheltered gap between solar panels and the roof.

The timing of the noise is your best clue:

When you hear it	What it sounds like	Most likely animal
Dawn and dusk	Fast scrambling, pattering, gnawing	Squirrels — most active at first and last light
Daytime	Cooing, wing flutter, repetitive shuffling	Pigeons or nesting songbirds
Spring mornings	Chirping, high traffic in and out	Songbird nest (sparrows, starlings)
Night	Slow, heavy movement; thumps	Possible raccoon — less common, worth checking promptly

Two follow-up checks from the ground: look along the panel edges with binoculars for nesting material poking out, and look in the gutters below the array for shredded debris or fragments of wire insulation. Either confirms you have tenants.

Is it dangerous?

It can be — the main risk is chewed wiring, which causes production loss, faults, and in the worst cases fire risk.

Squirrels gnaw constantly to wear down their teeth, and the exposed DC wiring under an array is at exactly nest height. Chewed insulation leads to ground faults and shutdowns, and a damaged conductor on a live rooftop circuit is nothing to leave alone — wire-repair service calls run $300–$700 per Boston Solar, and extended damage costs more. Birds are gentler on wiring but their nests dam drainage and their droppings degrade output daily.

The full damage picture, including a documented case of one squirrel taking out 17 panels, is in our guide to squirrels under solar panels in Connecticut.

What should I do this week?

Get eyes under the array before anything is sealed — an inspection first, then lawful cleanup, then exclusion.

1. Note the pattern. When does the noise happen, and where on the roof? That intel makes the inspection faster.
2. Book an inspection. SolarWash CT solar panel inspections start at $25 — and are free with any cleaning. We photograph what is under the array: nests, droppings, chewed insulation, everything.
3. Do not seal the gap yet. Blocking the perimeter while animals are underneath traps them against your wiring — a trapped squirrel chews everything trying to get out, and sealing active protected bird nests can be unlawful.
4. Exclude once it’s clear. A fitted solar panel critter guard closes the gap permanently — no-drill mesh around the array perimeter, installed after the space is cleaned out, starting at $300 with cleanup included.

Scratching noises do not resolve themselves; they escalate on the animal’s schedule, not yours. Call or text (203) 677-0875 and we will figure out what is up there.