Check your solar system

Enter your system details below. Get an instant estimate of performance loss, likely faults, and whether thermal inspection is recommended.

Solar Loss Checker

Estimate how much energy your solar system may be losing, identify likely faults, and track your health over time.

System size (kW)

System age (years)

Location

Current annual production (kWh) — optional

Panel manufacturer — optional

Inverter brand — optional

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

Based on conservative solar performance modelling and published degradation data

NRELIEA-PVPSSunSpecPVsyst+ published research

Updated June 2026 · Structured performance modelling