Advanced settings
Step 6 · Advanced settings brings together the engine parameters. The default values are suitable for most projects: change them only if you know why. Everything applied is recorded in Annex B of the report.
Simulation model
| Setting | Options | Default | See |
|---|---|---|---|
| Transposition model | Perez, Hay-Davies, Isotropic, Klucher, Reindl, King | Perez | Transposition |
| Soiling level | Clean, Low, medium, high soiling | Clean | Optical losses |
| IAM model | Fresnel with anti-reflective coating · Martin-Ruiz | Fresnel | Optical losses |
| Module electrical model | Single diode · Empirical Huld + temperature coefficient | Single diode | Single diode |
| Thermal model (Faiman) | u_c y u_v | 25,0 y 6,84 | Temperature |
| Sun position offset | minutes | 0 | Weather data |
| Weather source | PVGIS TMY, NASA POWER, PVGIS-ERA5, file, saved measurements | PVGIS TMY | Weather |
Advanced corrections
| Setting | Default |
|---|---|
| Spectral correction (First Solar) | Enabled |
| Low irradiance correction | Enabled |
Losses
| Setting | Default |
|---|---|
| Mismatch | 2,0 % |
| DC cabling | 1.0 % (or calculated with real cross-sections) |
| Connections | 0,5 % |
| Availability | 1,0 % |
To calculate the real cabling with cross-sections and protections according to the REBT, see Cabling and protections.
Electrical limits
| Setting | Default |
|---|---|
| Cold design temperature | −10 °C (or automatic according to the climate) |
| Hot design temperature | 70 °C |
| Maximum DC/AC ratio | 1,4 |
| Batteries to try in automatic mode | from 1 to 4 |
Uncertainty
Four sources (year-to-year variability 4 %, weather data 3 %, model and equipment 3 %, losses 2 %) giving P50, P90 and P99. See Uncertainty.
Far horizon
Get it from PVGIS or type it by hand. See Horizon.
Off-grid installation
| Setting | Default |
|---|---|
| Days of autonomy | 3 |
| Battery safety margin | 1,15 |
| Overall efficiency from modules to consumption | 0,75 |
Economics
Discount rate (5 %), energy inflation (2 %), degradation (0.5 %/year), horizon (25 years), financing and replacements. See Financial assumptions.
Expert mode
Some controls are only shown in expert mode. If you cannot see one of the settings described here, enable that mode.