When procuring solar panels, the customer should ask the supplier for the following documents to ensure that the product purchased is of quality and meets the technical requirements of the solar power system. :1.Catalogue: This document provides detailed product information, including specifications, characteristics, applications, performance, pricing and warranty policy.2. Estimated output spreadsheet: This document provides information on how much electricity a panel can produce under different lighting conditions. This helps customers estimate the efficiency and benefits of installing a solar power system.3. Specifications: This document provides detailed specifications of the panels such as capacity, voltage, current, efficiency and other specifications.4. Certifications and related documents: Includes product certificates, certificates and other relevant documents to ensure that panels manufactured and sold meet safety, quality and safety standards. quantity and environment.5. Installation and usage instructions: This document provides detailed instructions on how to install, connect and use solar panels safely and efficiently.If you have any questions, please contact AD Green for more detailed advice and answers.