PVsell has two performance models you can choose from: PVwatts or SAM (legacy). You can select one of them in the "Azimuth & Tilt" Array Definition mode.
PVwatts
This performance model allows the full range of orientation (azimuth) and tilts, for an endless number of arrays, globally. It also enables you to adjust the panel type, inverter efficiency, loss factors, and can even do tracking arrays.
SAM (legacy)
The 'SAM (legacy)' performance model allows you to quickly select the azimuth and tilt for up to three arrays, but doesn't model south-facing arrays or tilts beyond 40 degrees. It is only suitable in Australia.
Roof Layout
Lay'd is PVsell's awesome layout functionality that you can access on the 'Site' tab by clicking the 'Roof Layout' array definition. This mode requires you to perform a roof layout (which uses the PVwatts performance model).
Learn more:
Upload
This mode allows you to upload your own solar performance data for each hour of year (for a 1 kW array that PVsell will then scale to the capacity specified in the 'System' tab).
You can upload into PVsell a solar output data file produced with a simulation program like PVsyst or PVWatts (free).
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