Case Review: Incoming EL Sampling at a Philippines PV Project - Catching Transport Cracks Before Racking

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

A field review of a real project in the Philippines where incoming EL sampling was run on modules arriving after cross-border transport. This article walks through the decisions behind the sampling plan rather than just the procedure: why the inspection window was set between unloading and racking, how pallets and batches were covered so the sample reflected the whole shipment instead of the top layer, why injection current and imaging conditions were locked before the first module was tested, and how every image was bound to a module serial number so the report could support a return or claim afterwards. It also covers what the team deliberately did not do - no full inspection of every module, no attempt to attribute every crack to a single cause - and when incoming sampling is not worth the money, such as small residential batches or shipments where factory-gate full inspection was already witnessed. The takeaway for buyers: the value of incoming EL is highest at exactly one point in the supply chain, the moment when transport damage is still separable from installation damage, and the inspection design should serve the responsibility question first, image quality second.