Writing EL Inspection Clauses in PV Tender Specifications: Five Points That Decide Whether the Clause Works

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

Many PV tender documents copy EL inspection clauses from older projects, ending up with requirements that are either unenforceable or meaningless: a sampling ratio with no rule on how samples are distributed across pallets and batches, an image-quality demand with no stated imaging conditions, or a defect-rejection line with no agreed grading basis. This article walks through five clauses that actually determine whether an EL requirement protects the buyer: scope and timing of inspection (which supply-chain node, incoming or pre-racking), sampling design (how coverage is distributed, not just the percentage), imaging conditions (injection current, ambient light handling, resolution floor), judgment basis (which standard and which defect classes trigger rejection or re-sampling), and deliverables (serial-number binding, raw image retention, report format). It also covers common traps: clauses that demand full inspection where sampling would serve, requirements written around one vendor's equipment, and acceptance lines that no field instrument can verify. The goal is a specification that a bidder can price honestly and an owner can enforce at acceptance.