1) Project & Site
Units: meters, kW, °C
2) Module & Inverter
3) Roof Facets & Layout
Add one or more rectangular facets. Layout packs modules with setbacks and spacing; obstruction area is subtracted.
| Facet | W (m) | H (m) | Tilt° | Az° | Setback (m) | Spacing (m) | Orientation | Obstruction m² |
|---|
4) Irradiance, Temperatures & Losses
Monthly POA irradiance (kWh/m²) and ambient temperature (°C). Soiling loss per month (%).
| Month | POA (kWh/m²) | Ambient °C | Soiling % |
|---|
Roof Layout Visualizer
Scale 1:1
Each facet is drawn to scale relative to others. Blue rectangles = modules. Gray = obstructions (area approximation).
Total Modules
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kWdc
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Recommended inverter(s): —
Annual kWh (AC)
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DC/AC
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Clipping est.: —
String Sizing & MPPT Assignment
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| Check | Value |
|---|
Monthly Energy (AC)
| Month | POA | Temp °C | Soiling % | kWh |
|---|
Loss Waterfall (Annual)
Details & Assumptions
- Temperature model uses NOCT estimate:
Tcell = Tamb + (NOCT − 20)/800 × POA; power derate via γP (Pmax %/°C). - String checks: cold Voc against inverter Max DC; hot Vmp against MPPT min; strings/MPPT against current limit.
- Irradiance-to-energy: simple PR model. For precise results use hourly data; clipping estimate heuristic when DC/AC > 1.