Table of Inputs

The tables below list the inputs that can be modified in SunSolve P90.

Column definitions

• Parameter: Parameter name.
• Symbol: Symbol used in the equations in the help documentation.
• LL/UL: Lower and upper limits to the parameter value.
• Units: Unit of measurement.
• Default: Default value applied when the parameter is not specified.
• TimeStep: Whether the parameter can vary by time step (as loaded in the weather file).
• Input name: Syntax for assigning a base value to the input.
• Distribution name: Syntax for assigning a probability distribution to the input.

Notes

• Parameters marked with “TimeStep: Optional” can either be specified per time step or use a fallback value.
• Not all inputs can be assigned uncertainty distributions.
• Inputs are case sensitive.

Solar position, irradiance and weather

ParameterSymbolLLULUnitsDefaultTimeStepInput nameDistribution name

Solar zenith, θ_s, 0, 180, °, —, Yes, —, —

Solar azimuth, φ_s, 0, 360, °, —, Yes, —, —

GHI, GHI, 0, —, W/m², —, Yes, —, GHIDHI, DHI, 0, —, W/m², —, Yes, —, —Wind speed, w, 0, —, m/s, —, Yes, —, WindSpeed

Ambient temperature, T_a, —, —, °C, —, Yes, —, Temperature

Diffuse fraction modifier, f_DF, 0, —, —, 1, —, —, DiffuseFraction

Circumsolar fraction modifier, f_CF, 0, —, —, 1, —, —, CircumsolarFraction

Module inputs

ParameterSymbolLLULUnitsDefaultTimeStepInput nameDistribution name

Module length, L_m, >0, —, m, 2, —, length, —

Module width, W_m, >0, —, m, 1, —, width, —

Module height above ground, H_m, var, —, m, 1.5, —, height_above_ground, —

Rated power at STC, P_STC, >0, 100, %, 22, —, power_at_stc, ModulePower

Module bifaciality, f_B, 0, —, —, 1, , bifaciality,

Thermal coefficient of module power, B, 0, —, %/K, -0.00295, , module_efficiency_temperature_coefficient, ModuleEfficiencyTemperatureCoefficient

IAM (front and rear), —, —, —, —, n.a., —, —, —

System layout

ParameterSymbolLLULUnitsDefaultTimeStepInput nameDistribution nameRow pitch, P, >0, —, m, 5.6, —, row_pitch, —

Module azimuth, φ_m, 0, 360, °, 90, —, module_azimuth, —

Module tilt, β, -90, 90, °, 30, Optional, module_tilt, —

Module tilt limit, β_max, -90, 90, °, 55, —, module_tilt_limit, —

Module tracking, , , , , NotSet, , module_tracking, —

System optics

ParameterSymbolLLULUnitsDefaultTimeStepInput nameDistribution nameAlbedo, α, 0, 1, —, —, Optional, —, AlbedoAlbedo fallback, α, 0, 1, —, 0.2, —, fallback_albedo, —

Front beam multiplier, f_ΦBF, 0, —, —, 1, —, beam_multiplier_front, —

Rear beam multiplier, f_ΦBR, 0, —, —, 1, —, beam_multiplier_rear, —

Front isotropic multiplier, f_ΦIF, 0, —, —, 1.01, —, isotropic_multiplier_front, —

Rear isotropic multiplier, f_ΦIR, 0, —, —, 1, —, isotropic_multiplier_rear, —

Extra irradiance, —, —, —, —, 1, —, —, —

Structural shading factor, k_S, 0, 1, —, —, Optional, —, RearStructuralShadingFactor

Structural shading fallback, —, 0, 1, —, 0, —, fallback_rear_structural_shading_factor, —

Transmission factor, k_T, 0, —, —, —, Optional, —, RearTransmissionFactor

Transmission factor fallback, —, 0, —, —, 0, —, fallback_rear_transmission_factor, —

Spectral correction factor, f_λ, 0, —, —, —, Optional, —, SpectralCorrection

Spectral correction fallback, f_λ, 0, —, —, 1, —, fallback_spectral_correction, —

Front soiling, k_σF, 0, 1, —, —, Optional, —, SoilingFront

Front soiling fallback, k_σF, 0, 1, —, 0.02, —, fallback_soiling_front, SoilingFront

Rear soiling, k_σR, 0, 1, —, —, Optional, —, SoilingRear

Rear soiling fallback, k_σR, 0, 1, —, 0.01, —, fallback_soiling_rear, SoilingRear

Thermal

ParameterSymbolLLULUnitsDefaultTimeStepInput nameDistribution name

U_c, Uc, 0, —, W/m²/K, 25, —, uc, Uc

U_v, Uv, 0, —, W∙s/m³/K, 1.2, —, uv, Uv

Alpha, α, 0, 1, —, 0.9, —, alpha, Alpha

System electronics

ParameterSymbolLLULUnitsDefaultTimeStepInput nameDistribution nameModules per string, NM, 1, —, —, 1, —, modules_per_string, —Strings per inverter, NS, 1, —, —, 1, —, strings_per_inverter, —Number of inverters, NI, 1, —, —, 1, —, number_of_inverters, —Cell-to-cell mismatch, kMC, 0, 1, —, 0.004, —, cell_to_cell_mismatch, CellToCellMismatchMax-power tracking loss, kMPT, 0, 1, —, 0, —, max_power_tracking_loss, —String wiring loss, kWS, 0, 1, —, 0.01, —, string_wiring_loss, —

Module-to-module mismatch, kMM, 0, 1, —, 0.01, —, module_to_module_mismatch, ModuleToModuleMismatch

String-to-string mismatch, kMS, 0, 1, —, 0, —, string_to_string_mismatch, StringToStringMismatchInverter clipping power, Pclip, 0, —, W, —, —, NOT AVAILABLE YET, —Inverter efficiency, ηinv, 0, 1, —, 0.98, —, inverter_efficiency, InverterEfficiencyInverter wiring loss, kWI, 0, 1, —, 0, —, inverter_wiring_loss, —

Inverter-to-inverter mismatch, kMI, 0, 1, —, 0, —, inverter_to_inverter_mismatch, InverterToInverterMismatch

System operation

ParameterSymbolLLULUnitsDefaultTimeStepInput nameDistribution nameAnnual degradation rate, d, 0, 1, —, 0, —, annual_degradation_rate, AnnualDegradationRateDC health, kDCH, 0, 1, —, 0, —, dc_health, DCHealthAvailability, favail, 0, 1, —, 0.99, —, availability, AvailabilityCurtailment, kcurt, 0, 1, —, 0, —, curtailment, CurtailmentYield modifier, fY, 0, —, , 1, —, yield_modifier, YieldModifierUndulatingGround, , , , , 1, —, undulating_ground, —

Simulation options

Analysis Scope

• number_of_years (default: 5): Number ofears to simulate
• number_of_simulations (default: 1000): Monte Carlo iterations per year

Computational Limits

• Maximum total simulations: 250,000 (number of years × number of simulations)

Result options

P-Value Selection

• p_values (default: [50]): List of P-values to calculate (e.g., [10, 50, 90, 95])

Histogram Settings

• p_min (default: 0.75): Minimum percentile for histogram binning
• p_delta (default: 0.01): Histogram bin width