How to Choose a Third-Party EL Inspection Provider: Six Things to Check Before You Sign

ⓘ This article is currently published in Chinese. An English version is being prepared — read the Chinese original.

Once a PV plant owner decides to outsource EL inspection, the next question is harder: which provider? This article lays out six practical checkpoints for evaluating a third-party EL inspection service — report accreditation and what it is actually valid for, field capability including daytime EL and drone-based imaging at scale, defect grading criteria and how they are documented, deliverables such as serial-number-bound images and raw data retention, independence from module manufacturers and EPC contractors, and scheduling responsiveness. It also explains when a lightweight check is enough and a full accreditation package is unnecessary, helping owners match the level of scrutiny to what the report will be used for — financing, warranty claims, or internal maintenance decisions.