The module type describes the photovoltaic modules in the array. If you do not have information about the modules in the system, use the default Standard module type. Otherwise, you can use information from the module data sheet and the table below to choose the module type.
| PVWatts® Module Type | Cell Material | Approximate Nominal Efficiency | Module Cover | Temperature Coefficient of Power |
|---|---|---|---|---|
| Standard | Crystalline Silicon | 19% | Glass with anti-reflective coating | -0.37%/°C |
| Premium | Crystalline Silicon | 21% | Glass with anti-reflective coating | -0.35%/°C |
| Thin Film | Thin film | 18% | Glass with anti-reflective coating | -0.32%/°C |
See the Technical Reference for details about how PVWatts® models the different module types.