Preliminary design > Grid System Presizing

Presizing is a rough estimation of the PV system energy yield, based on a few very general parameters and mainly dedicated to architects during an early evaluation of a site. You should not use this tool for the study of a system.

The meteo input data are computed in monthly values (taking plane orientation and horizon into account) and applies efficiency coefficients according to a PV technology and other considerations. These coefficients may eventually be re-adjusted by an expert user for special conditions in the Hidden parameters. The expected precision could be around 10% or more.

More precise results will be obtained with the hourly simulation performed through the "Project Design" option, including realistic available components and detailed system perturbations.

Specifically, the financial aspects are based on rough hypothesis, which can widely vary from country to country. These hypothetical financial parameters can be adjusted by the user by choosing "Edit costs" in the economic results sheet.