System Planner
This guide is a starting framework, not a system design or a performance guarantee. It helps project owners bring the right questions to their installer, EPC, electrical engineer, and procurement contact.
List the intended application, usable area, orientation, expected energy use, backup or export objective, roof or ground condition, and local permitting constraints. Ask which assumptions are being used for irradiance, temperature, shading, and module soiling. A production forecast should state its inputs and uncertainty rather than present a single number as certain.
TOPCon and heterojunction designs can be evaluated through the conditions most relevant to the project, including temperature behavior, bifacial response, availability, cost, and the warranty terms actually offered. Higher nameplate efficiency can be valuable where area is constrained, while service access, mounting design, and supply timing may matter more in another project.
Confirm nominal power, module efficiency, system voltage, inverter compatibility, and the required IEC 61215 or IEC 61730 documentation. Then record who owns commissioning evidence, monitoring access, cleaning guidance, fault escalation, and warranty communication. Each item is easier to resolve before delivery than after energization.
Array drawings, expected DC configuration, climate notes, and the target operating scenario.
Current datasheet, installation instructions, applicable test or certification references, and declared test conditions.
Region, delivery window, receiving conditions, commissioning owner, and a named route for questions.
Share the application, desired power range, and region. We will help identify the documents and technical questions to review next.
Selection note: TOPCon and heterojunction module choices involve supply availability, temperature behavior, degradation assumptions and bankability. Nominal power and module efficiency must be checked against the current datasheet, test conditions and the project-specific IEC 61215 / IEC 61730 requirements.