Is your solar system underperforming?

Check for hidden solar energy loss, understand likely faults, and decide whether you need a thermal inspection.

System size, age, and location. Optional: production data and inverter brand.

See estimated performance loss, likely causes, and what you can check yourself.

Monitor, self-check, or consider a professional thermal inspection.

Solar Loss Checker

Estimate how much energy your solar system may be losing — and why.

System size (kW)

System age (years)

State

Current annual production (kWh) — optional

Inverter brand — optional

No personal data stored. Results are estimates based on conservative modelling.

Estimate what a solar thermal inspection would cost for your system.

Costs vary by location and provider. These are conservative estimates based on market averages.

6.5 kW · 8 years · Arizona

8–18%

Soiling, hotspots, natural degradation

Elevated risk

4 kW · 3 years · New Jersey

2–5%

Minor natural degradation

Low risk

10 kW · 12 years · Texas

12–22%

Degradation, inverter age, soiling

High risk

Based on conservative solar performance modelling and published degradation data

NRELIEA-PVPSSunSpecPVsyst+ published research

Updated April 2026 · Structured performance modelling