Solar Panels Not Producing? How to Diagnose the Problem
Low or zero solar production has a short list of causes, and they're worth checking in order — several are free fixes, and the diagnosis order prevents paying a technician to flip a breaker.
Check in this order
- The inverter display or app. A red or fault light usually names the problem. See our inverter warning light guide.
- Breakers and disconnects. The solar breaker in your main panel and the AC/DC disconnects can trip in storms. One reset is fine; repeated trips mean call a pro.
- Monitoring vs reality. If the app shows zero but the inverter shows production, it's a monitoring/WiFi dropout — annoying, not broken.
- New shading. Tree growth is the slow killer of production — compare this spring's output to the same month two years ago.
- Dirt and debris. Pollen film, bird droppings, and leaf packs can cut output 5–20%. In low-rain regions an annual cleaning pays for itself.
- Panel-level faults. Hot spots, snail trails, cracked glass, or one string down — this tier needs a licensed solar technician with an IV-curve tester.
When the installer is gone
If your original installer went out of business, manufacturer warranties on panels and inverters still apply — you just need an independent servicer to diagnose and file them. Solar Relief matches you with vetted techs who work on orphaned systems.
Frequently asked questions
Why is my solar production lower than last year?
The usual suspects in order: new shading from tree growth, dirt accumulation, an inverter derating or fault, or a failed panel string. Compare same-month output year-over-year to size the drop.
How much does a solar inspection cost?
Independent system inspections typically run $150–$400 and include string testing and an inverter health check.