A solar panel inspection checks your panels, racking, roof penetrations, wiring, connectors, inverter and production data to catch damage, safety hazards and lost output early. Most homes need a professional inspection every 1–3 years and after severe weather. A standard residential inspection costs about $150–$300; adding thermal (infrared) or drone imaging brings it to roughly $300–$600.
Key takeaways
- Inspections find problems you can’t see from the ground: hot spots, micro-cracks, loose or corroded connectors, damaged cables and roof leaks.
- Do your own monthly monitoring and ground-level check; book a professional for anything on the roof or electrical.
- Thermal imaging is the most valuable add-on — it reveals failing cells and connections before they fail completely.
- Keep every inspection report: it supports warranty, insurance and home-sale paperwork.
In this guide
What is a solar panel inspection?
A solar panel inspection is a structured check of the entire photovoltaic (PV) system, not just the glass. A qualified technician looks at the physical condition of panels and mounting, tests the electrical side (strings, connectors, grounding, inverter), reviews production data, and documents everything in a report with photos. The goal is simple: confirm the system is safe, performing as designed and still in warranty.
It complements — but is different from — routine cleaning. Cleaning removes dirt; an inspection finds faults. Most homeowners combine both in their solar panel maintenance plan.
When should you get a solar panel inspection?
| Trigger | Why it matters |
|---|---|
| Every 1–3 years (routine) | Catches wear on connectors, cables and mounts before failures |
| After hail, high winds, heavy snow or a nearby lightning strike | Cracked glass and loosened racking aren’t always visible from the ground |
| Production drop of 10%+ on sunny days | Points to faults, shading or soiling that need diagnosis |
| Inverter error codes or frequent shutdowns | May indicate ground faults, arc faults or overheating |
| Before your workmanship warranty ends | Lets you claim installer fixes for free while you still can |
| Buying or selling a home with solar | Confirms condition, ownership/lease status and real output |
| After roof work, re-roofing or pest problems | Panels may have been moved; wiring may be damaged by birds or rodents |
Solar panel inspection checklist
A thorough professional inspection should cover these areas:
1. Panels (modules)
- Cracked, chipped or shattered glass; scratches in the anti-reflective coating
- Discoloration, browning, “snail trails”, bubbles or delamination
- Burn marks or melted backsheet near junction boxes
- Soiling, droppings, debris and new shading from trees
2. Racking and roof
- Loose clamps, bolts and rails; corrosion on mounts
- Condition of flashing and sealant at every roof penetration
- Signs of leaks in the attic or ceiling below the array
- Birds or rodents nesting under the panels (see bird proofing solar panels)
3. Wiring and electrical
- Damaged, sagging, chewed or UV-cracked cables; conduit integrity
- MC4 connector condition — no melting, corrosion or loose fits
- Grounding/earthing continuity and bonding
- String voltage (Voc) and current (Isc) measurements; I-V curve tracing on advanced inspections
- DC/AC disconnects, breakers, rapid-shutdown devices and labeling
4. Inverter, optimizers and batteries
- Fault and event logs, firmware version, cooling and ventilation
- Microinverter or optimizer communication with every panel
- Battery state of health, temperature and enclosure condition
5. Performance
- Actual production vs. the original design estimate and last year’s output
- Panel-level comparison (on microinverter/optimizer systems) to spot underperformers
Safety: panels produce DC voltage whenever light hits them, even when the inverter is off. Electrical testing and any work on the roof should only be done by qualified, insured technicians.
Types of solar panel inspection
| Inspection type | What it involves | Best for |
|---|---|---|
| Visual inspection | Ground and roof-level checks of panels, mounts, wiring and roof | Routine checks, post-storm assessments |
| Electrical inspection | String voltage/current tests, insulation resistance, grounding, inverter logs | Diagnosing faults, warranty claims |
| Thermal (infrared) inspection | Thermal camera reveals hot cells, failed bypass diodes and hot connectors | Finding hidden defects before failure |
| Drone thermal inspection | Infrared and visual imaging from a drone flown by a licensed pilot | Large, steep or hard-to-access roofs; commercial arrays |
| Post-installation / permit inspection | Building and electrical code compliance check by your local authority | New systems before permission to operate |
| Pre-purchase inspection | Condition, output history, warranty and ownership documentation | Buying a home with solar |
For a typical single-family home, a technician with a handheld thermal camera usually covers the same issues as a drone at a lower cost.[1] Drone surveys shine on large or awkward roofs, where they avoid walking on the array entirely.
Your own monthly solar check (no ladder needed)
- Open your monitoring app and compare this month’s sunny-day output with the same month last year.
- Look for panel-level outliers if you have microinverters or optimizers — one low panel is a red flag.
- Check the inverter display or LEDs for warnings, and make sure vents are clear.
- Scan the array from the ground with binoculars for cracks, debris, droppings, nests and loose cables.
- Check the ceiling under the array for water stains after heavy rain.
- Log what you see with dates and photos — it speeds up any warranty claim.
If panels look dirty or output is falling slowly, start with a clean — see how to clean solar panels and how often solar panels need cleaning.
How much does a solar panel inspection cost?
| Service | Typical U.S. cost |
|---|---|
| Standard residential inspection (visual + basic electrical) | ~$150–$300[2] |
| Thermal / drone thermal inspection | ~$400–$600[3] |
| Inspection bundled with cleaning | Often discounted vs. two separate visits |
| Full annual maintenance plan | ~$390–$720 per year (average ~$520)[2] |
Prices depend on system size, roof height and pitch, whether thermal imaging or I-V curve testing is included, and travel distance. Many installers include a free inspection during the workmanship warranty period — check your contract before paying. For cleaning prices, see our solar panel cleaning cost guide.
Common problems a solar inspection finds
| Problem | Typical cause | Usual fix |
|---|---|---|
| Hot spots | Cracked cells, shading, droppings, failed bypass diodes | Clean; replace panel under warranty if damaged |
| Micro-cracks | Hail, foot traffic, poor handling at installation | Monitor or warranty claim |
| Melted or loose MC4 connectors | Poor crimping, mismatched brands, water ingress | Replace connectors (electrician) |
| Chewed cables | Squirrels, rats, nesting birds | Repair wiring; fit critter guard |
| Roof leaks | Failed flashing or sealant at mounts | Reseal/reflash; roofer + installer |
| Ground faults / inverter errors | Insulation damage, moisture | Locate and repair fault |
| Gradual output loss | Soiling, new shade, aging | Clean, trim trees, compare with degradation warranty |
How to choose a solar panel inspector
- Credentials: NABCEP PV certification, a licensed electrician, or your original installer.
- Insurance: general liability and workers’ comp; drone operators should hold an FAA Part 107 certificate.
- Scope in writing: visual, electrical tests, thermal imaging, roof penetrations, inverter logs and a photo report.
- Independence: for home purchases or disputes, consider an inspector with no stake in selling repairs.
- Local experience: climate matters — hail in Colorado and Texas, salt air in Florida and Hawaii. See our state-by-state solar guides.
Frequently asked questions
What is a solar panel inspection?
A solar panel inspection is a visual, electrical and often thermal check of your whole PV system — panels, racking, roof penetrations, wiring, connectors, inverter and monitoring — to confirm it is safe, producing as expected and still covered by warranty.
How much does a solar panel inspection cost?
A standard residential inspection typically costs about $150–$300. Adding infrared (thermal) imaging or a drone survey usually brings it to roughly $300–$600, and detailed forensic or insurance inspections can cost more.
How often should solar panels be inspected?
Get a professional inspection every 1–3 years, after severe weather such as hail or high winds, before your workmanship warranty expires, and before buying or selling a home with solar. Check your monitoring app monthly in between.
Who inspects solar panels?
Your original installer, an independent NABCEP-certified PV technician, a licensed electrician or a specialist solar inspection company. Drone thermal surveys should be flown by an FAA Part 107-certified pilot.
Is a drone solar panel inspection worth it for a house?
Often not essential. A handheld thermal camera used by a technician covers most single-family systems. Drone thermal inspections are most useful for large, steep or hard-to-reach arrays and commercial roofs.
Can I inspect my own solar panels?
You can do a safe ground-level visual check and review your monitoring data. Electrical testing, roof access and opening any equipment should be left to qualified professionals because panels produce DC voltage whenever light hits them.
Sources
- Inspect & Test, Infrared camera drones for inspections.
- Angi, Solar Panel Maintenance Cost (inspection and annual maintenance ranges).
- Averroes.ai, Drone Solar Panel Inspection Cost 2026.
Researched from installer checklists, inspection-industry pricing and safety guidance. Our editorial policy.