EL Inspection — Now in Daylight
An “X-ray” for every PV module
UAV-borne short-wave infrared imaging works day or night and supports operating-condition EL, delivering image-grade evidence across the plant lifecycle.
Why Longsafe Daytime EL
We moved EL inspection from night to daylight — more efficient and safer.
24/7 operation
Inspect by day or night — no waiting for darkness, doubling the working window and cutting night high-altitude risk.
Operating-condition EL
Imaging while modules generate power — no shutdown, no output loss, reflecting real operating state.
Fast UAV coverage
For large bases and distributed sites — about 1000–1500 modules/day, ≤5s per module.
SWIR pixel-level imaging
InGaAs sensor clearly identifies hidden cracks, micro-cracks, broken gridlines, cold solder, PID, poor sintering and breakage.
Covering the key inspection scenarios
From grid-connection acceptance to O&M, from ground plants to rooftops.
Ground-mount plants
Pre-grid installation checks and O&M health inspection for large ground/mountain/plateau plants — daytime work keeps the schedule on track.
C&I rooftops
Operating-condition EL inspection for rooftop distributed modules — no shutdown, fast defect screening.
Testing institutions
Daytime/night EL comparison data and large-batch module testing as a capability extension for third-party labs.
On real project sites
From C&I rooftops to mountain ground-mount plants, drone-based daytime EL is already at work on these projects — field shots and real daytime EL imaging samples.
Field photos carry capture time and anti-tamper watermarks; the EL sample is the device's direct imaging output — all verifiably real. Some site details are anonymized to protect client privacy.
Let the imaging speak
Workflow aligned with IEC TS 60904-13:2018 — quantifiable, traceable, archivable data.
FAQ
Can EL really be done in daylight?
Yes. With SWIR imaging and differential algorithms, readable EL images are captured in daylight (0–1200 W/m²) — no need to wait for night.
Do modules need to be shut down?
Operating-condition EL images modules while they generate power, with no output impact. An offline biased mode is also available per project.
Should I buy equipment or a service?
Either. Buy the daytime EL system for long-term frequent needs, or choose our pay-per-project inspection service for one-off needs.
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