Variable Input-Output Table

This table provides a comprehensive mapping of variables and parameters in the PlantPredict engine: external inputs, model parameters, key interface variables between models, and final outputs.

External Inputs

Weather Data

Variable	Symbol	Units	Destination(s)
UTC Date-Time	—	datetime	• Solar Position • Extraterrestrial Irradiance • Sunrise/Sunset Model
Global Horizontal Irradiance	$GHI$	W/m²	• Irradiance Quality Check • Decomposition • Transposition • Ground-Reflected Shading
Direct Normal Irradiance	$DNI$	W/m²	• Irradiance Quality Check • Transposition • Ground-Reflected Shading
Diffuse Horizontal Irradiance	$DHI$	W/m²	• Irradiance Quality Check • Transposition • Ground-Reflected Shading
Ambient Air Temperature	$T_a$	°C	• Solar Position (refraction) • Module Temperature • Inverter Derating • Decomposition (Reindl) • Spectral Models
Wind Speed	$v_w$	m/s	Module Temperature
Atmospheric Pressure	$P$	hPa	• Solar Position (refraction) • Air Mass • Decomposition (DIRINT) • Bird Clear Sky
Relative Humidity	$RH$	%	• Decomposition (Reindl) • Spectral Models
Wind Gust Speed	$v_{gust}$	m/s	Wind Stow
Dewpoint Temperature	$T_d$	°C	Spectral Models
Plane-of-Array Irradiance	$G_{POA}$	W/m²	POAI Decomposition (when Frontside POAI enabled)

Site Configuration

Variable	Symbol	Units	Destination(s)
Latitude	$\varphi$	degrees	Solar Position
Longitude	$\lambda$	degrees	Solar Position
Altitude	$h$	m	• Solar Position () • Pressure calculation • Inverter Derating
Albedo	$\rho$	—	• Transposition • Bifacial Model • Bird Clear Sky
Standard UTC Offset	$\text{UTC}_{\text{off}}$	hours	Sunrise/Sunset Model
Horizon Profile	$(\gamma_i, e_i)$	degrees	Horizon Shading

Other Time Series Inputs (Optional)

Input	Units	Used In
Monthly Albedo Factors	—	Transposition
Monthly Soiling Factors	%	Soiling Model
Module Temperature Time Series	$T_{m,measured}$	°C	Override calculated temperature
Tracking Angle Time Series	degrees	User-defined tracking
Vmpp Time-Series Adjustment	$\Delta V_{MPP}$	%	Operating Region (V7+)
Impp Time-Series Adjustment	$\Delta I_{MPP}$	%	Operating Region (V7+)
Inverter Derate Time Series	—	Power derating schedule
Inverter Set Point Time Series	W	Power limiting schedule
LGIA Limit Time Series	MW	POI power clipping

Model Parameters

Module Parameters (Single Diode Model)

Parameter	Symbol	Units	Used In
Reference Short-Circuit Current	$I_{sc,ref}$	A	Parameter Translation → Single Diode Model
Reference Power	$P_{mp,ref}$	W	Parameter Translation / DC Wiring Resistance
Number of Cells in Series	$N_c$	—	• Parameter Translation • Single Diode Model
Temperature Coefficient of Isc	$\alpha_{I_{sc}}$	%/°C	Parameter Translation → Single Diode Model
Diode Ideality Factor	$\gamma_{ref}$	—	Parameter Translation
Temp. Coeff. of Ideality Factor	$\alpha_{\gamma}$	1/°C	Parameter Translation
Ideality Factor Polynomial Coefficients	$a_\gamma, b_\gamma, c_\gamma, d_\gamma$	various	Parameter Translation
Reference Series Resistance	$R_{s,ref}$	Ω	Parameter Translation → Single Diode Model
Reference Shunt Resistance	$R_{sh,ref}$	Ω	Parameter Translation → Single Diode Model
Reference Saturation Current	$I_{0,ref}$	A	Parameter Translation → Single Diode Model
Dark Shunt Resistance	$R_{sh,0}$	Ω	Parameter Translation (irradiance) → Single Diode Model
Shunt Resistance Exponent	$R_{sh,exp}$	—	Parameter Translation (irradiance) → Single Diode Model
Bandgap Energy	$E_g$	eV	Parameter Translation (temperature) → Single Diode Model
Recombination Parameter	$d_i^2/\mu\tau$	V	Single Diode Model (7-parameter)
Built-in Voltage	$V_{bi}$	V	Single Diode Model (7-parameter)
Reference Irradiance	$G_{ref}$	W/m²	• Parameter Translation • Temperature Models • DC Wiring Resistance
Reference Temperature	$T_{ref}$	°C	• Parameter Translation • DC Wiring Resistance

Module Temperature Parameters

Parameter	Symbol	Units	Model
Conductive Heat Transfer Coefficient	$u_c$	W/m²·K	Heat Balance
Convective Heat Transfer Coefficient	$u_v$	W/m²·K per m/s	Heat Balance
Cell-to-Module Temperature Difference	$\Delta T_{c-m}$	°C	All temperature models
Absorption Coefficient	$\alpha_T$	—	Heat Balance
Module STC Efficiency	$\eta_{STC}$	—	Heat Balance / NOCT-SAM
Conductive Coefficient	$a$	—	Sandia
Convective Coefficient	$b$	s/m	Sandia
Transmittance-Absorptance	$\tau\alpha$	—	NOCT-SAM
NOCT	$NOCT$	°C	NOCT-SAM

Inverter Parameters

Parameter	Symbol	Units	Used In
Minimum MPP Voltage	$V_{MPP,min}$	V	Operating Region
Maximum MPP Voltage	$V_{MPP,max}$	V	Operating Region
Maximum Absolute Voltage	$V_{max}$	V	Operating Region
Minimum DC Power	$P_{min}$	W	Operating Region
AC Rated Power	$P_{AC,rated}$	kVA	Power Limiting
Efficiency Curves	$\eta_{V_j}(P_{AC,i})$	kW, %	Efficiency Model
Temperature-kVA Curves	$P_{AC,derate,h_k}(T_j)$	°C, kVA	Temperature Derating
AC Power Setpoint	$P_{AC,set}$	kVA	Temperature Derating / Power Limiting

DC Field & Loss Parameters

Parameter	Symbol	Units	Used In
Module Mismatch Coefficient	$f_{MM}$	%	DC Power Reduction
Light-Induced Degradation	$f_{LID}$	%	DC Power Reduction
Module Quality Factor	$f_{MQ}$	%	DC Power Reduction
DC Health Factor	$f_{DCH}$	%	DC Power Reduction
DC Wiring Loss Percentage	$L_{wire}$	%	DC Wiring Resistance
DC Wiring Resistance	$R_{DC,module}$	Ω	Added to Series Resistance
Degradation Rate (Linear)	$r_{deg}$	%/year	Annual Degradation
Nonlinear Degradation Rates	$[r_0, r_1, ...]$	%/year	Nonlinear Degradation
LeTID Annual Rates	$[l_0, l_1, ...]$	%/year	LeTID Degradation
Bifaciality Factor	$\phi$	—	Rear-Side Weighting
Structure Shading Factor	$f_{str}$	%	Rear-Side Losses
Backside Mismatch Factor	$f_{MM,rear}$	%	Rear-Side Losses
Module Transmission Factor	$\tau$	—	Rear Irradiance (bifacial)
SunSolve Transmission Gain	$f_T$	—	Rear Irradiance (bifacial, SunSolve-calibrated mode)
Field-Level Wiring Resistance	$R_{DC,field}$	Ω	Loss Reporting
Energization Date	$t_0$	datetime	DC Degradation Model

Transformer Parameters

Parameter	Symbol	Units	Used In
MV Transformer No-Load Loss	$L_{NL,MV}$	%	MV Transformer Model (quadratic)
MV Transformer Full-Load Loss	$L_{FL,MV}$	%	MV Transformer Model (quadratic)
MV Transformer Rated Power	$P_{MV,rated}$	kVA	Transformer Model (quadratic)
HV Transformer No-Load Loss	$L_{NL,HV}$	%	HV Transformer Model (quadratic)
HV Transformer Full-Load Loss	$L_{FL,HV}$	%	HV Transformer Model (quadratic)
HV Transformer Rated Power	$P_{HV,rated}$	MVA	HV Transformer Model (quadratic)

AC System Parameters

Parameter	Symbol	Units	Used In
AC Collection Loss	$f_{coll}$	%	Array-Level Losses
Transmission Line Resistance	$R_{line}$	Ω/1000 ft	Transmission Loss
Transmission Line Length	$\ell_t$	km	Transmission Loss
Transformer High-Side Voltage	$V_{HS}$	kV	Transmission Loss
Conductors per Phase	$N_{cond}$	—	Transmission Loss
Inverter Design Derate	$d$	—	Power Factor / Transmission Loss
Cooling Load	$L_{cool}$	W	Auxiliary Load
Tracker Motor Load	$L_{track}$	W	Auxiliary Load
DAS Load	$L_{DAS}$	W	Auxiliary Load
Availability Loss Factor	$f_{avail}$	%	• Availability Loss • Power Flow (ESS re-run)
Grid Limit (LGIA)	$P_{POI}$	MW	POI Power Clipping

DC Field Geometry

Parameter	Symbol	Units	Used In
Fixed Tilt Angle	$\beta_{fixed}$	degrees	Surface Orientation
Fixed Azimuth Angle	$\gamma_{fixed}$	degrees	Surface Orientation
Tracker Axis Azimuth	$\gamma_{axis}$	degrees	Tracking Algorithm
Tracker Axis Tilt	$\beta_{axis}$	degrees	Tracking Algorithm
Minimum Rotation Limit	$\alpha_{min}$	degrees	Tracking Algorithm
Maximum Rotation Limit	$\alpha_{max}$	degrees	Tracking Algorithm
Nighttime Stow Angle	$\alpha_{stow,night}$	degrees	Tracking Algorithm
Wind Stow Angle	$\alpha_{stow,wind}$	degrees	Wind Stow
Ground Slope	$\beta_g$	degrees	• Backtracking • Shading Models
Ground Slope Azimuth	$\gamma_g$	degrees	• Backtracking • Shading Models
Ground Coverage Ratio	$GCR$	—	• Backtracking • Shading Models • Bifacial Model
Post Height	$h_{post}$	m	Bifacial Model
Row-to-Row Pitch	$p$	m	• Shading Models • Backtracking • Bifacial Model • GCR calculation
Collector Width	$\ell_m$	m	• Shading Models • Backtracking • Bifacial Model • GCR calculation
Row Length	$L$	m	Row-to-Row Beam Shading
Bay Pile Heights	$(h_{S,i}, h_{N,i})$	m	Terrain-Aware Backtracking
East Neighbor Pile Heights	$(h'_{E,S,i}, h'_{E,N,i})$	m	Terrain-Aware Backtracking
West Neighbor Pile Heights	$(h'_{W,S,i}, h'_{W,N,i})$	m	Terrain-Aware Backtracking
Bay Length	$L_b$	m	Row-to-Row Beam Shading
Bay Spacing	$s_b$	m	Row-to-Row Beam Shading
Bays Per Row	$N_b$	—	Row-to-Row Beam Shading
Number of Rows	$N_{rows}$	—	Row-to-Row Beam Shading
Cross-Axis Slope	$\beta_c$	degrees	Sky Diffuse Shading
DC Field Repeater Count	$n_{rep,i}$	—	DC Field Aggregation
Inverter Repeater Count	$n_{rep,inv}$	—	Array-Level Losses
Array Repeater Count	$n_{rep,array}$	—	• Array-Level Losses • Plant-Level Losses
Block Repeater Count	$n_{rep,block}$	—	Plant-Level Losses
Strings per Inverter	$N_{p,i}$	—	• Current scaling (parallel) • DC wiring resistance
Modules per String	$N_{s,i}$	—	• String voltage (Vmp, Voc) • DC wiring resistance

Tracking Control Parameters

Parameter	Symbol	Units	Used In
Hesitation Factor	$f_h$	—	Irradiance Optimization
Rotation Speed	$\omega$	degrees/s	Irradiance Optimization
Wind Stow Threshold	$v_{threshold}$	m/s	Wind Stow
Time Interval	$\Delta t$	seconds	Irradiance Optimization
Time Interval	$\delta t$	minutes	Battery Model

Spectral Correction Parameters

Parameter	Symbol	Units	Used In
Sandia Polynomial Factors	$[a_0, ..., a_4]$	—	Spectral Correction (Sandia)
Two-Variable Coefficients	$[b_0, ..., b_5]$	—	Spectral Correction (Two-Variable)
Monthly Spectral Loss	$L_{spectr,month}$	%	Spectral Correction (Monthly Override)

Electrical Shading Parameters

Parameter	Symbol	Units	Used In
Fractional Shading Percent	$f$	%	Electrical Shading (Fractional)
Number of Module Rows	$M$	—	Electrical Shading (Fractional, pre-V12)
Number of Bay Fractions	$N$	—	Electrical Shading (Step-Fractional, V12+)

IAM Parameters

Parameter	Symbol	Units	Used In
ASHRAE IAM Parameter	$b_0$	—	IAM (ASHRAE) / Ground-Reflected Shading
Sandia IAM Polynomial Factors	$[b_0, ..., b_5]$	degree⁻ⁱ	IAM (Sandia)
Refractive Index	$n$	—	IAM (Physical)
ARC Refractive Index	$n_{ARC}$	—	IAM (Physical)
Absorption Coefficient (glass)	$\alpha_{abs}$	m⁻¹	IAM (Physical)
Glass Thickness	$L_{glass}$	m	IAM (Physical)
IAM Factor Pairs	$\{(\theta_i, f_i)\}$	degrees, —	IAM (Tabular)

ESS Parameters (Optional)

Parameter	Symbol	Units	Used In
Nameplate Energy Capacity	$E_{nom}$	MWh	State-of-Charge Calculation
Usable Capacity Factor	$f_{usable}$	—	State-of-Charge Calculation
Initial Round-Trip DC Efficiency	$\eta_{RT,init}$	%	Round-Trip Efficiency
Capacity Cycle Degradation Rate	$d_{E,cycle}$	%/cycle	Battery Degradation
Capacity Calendar Degradation Rate	$d_{E,year}$	%/year	Battery Degradation
RTE Cycle Degradation Rate	$d_{\eta,cycle}$	%/cycle	Battery Degradation
RTE Calendar Degradation Rate	$d_{\eta,year}$	%/year	Battery Degradation
ESS Inverter Efficiency	$\eta_{inv}$	%	DC/AC Conversion Efficiency (Charge/Discharge)
ESS Inverter Rated AC Power	$P_{AC,rated,ESS}$	MW	Charge & Discharge Limits
ESS MV Transformer No-Load Loss	$L_{NL,ESS}$	%	ESS Transformer Model (quadratic)
ESS MV Transformer Full-Load Loss	$L_{FL,ESS}$	%	ESS Transformer Model (quadratic)
ESS MV Transformer Rating	$P_{MV,rated,ESS}$	MVA	ESS Transformer Model (quadratic)
Custom Inverter Capacity Fraction	$f_{cap}$	—	Charge & Discharge Limits (Custom Dispatch)
Dispatch Table	$D_{m,h}$	boolean	Dispatch Algorithms
Custom Dispatch Time Series	$C_t$	—	Dispatch Algorithms

Stage 1: Irradiance Variables

Solar Position, Extraterrestrial, and Clear-Sky Irradiance

Variable	Symbol	Units	Origin	Destination(s)
Solar	$\theta_z$	degrees	Solar Position Algorithm	• Air Mass • Decomposition • Transposition • Shading • Bird Clear Sky
Solar Angle	$\gamma_s$	degrees	Solar Position Algorithm	• Tracking • Shading
Sunrise Time	$t_{rise}$	datetime	Sunrise/Sunset Model	• Operational hours • Horizon Shading
Sunset Time	$t_{set}$	datetime	Sunrise/Sunset Model	• Operational hours • Horizon Shading
Extraterrestrial Direct Normal Irradiance	$DNI_{extra}$	W/m²	Extraterrestrial Irradiance	• Transposition • Decomposition • Bird Clear Sky
Clear-Sky Global Horizontal Irradiance	$GHI_{clear}$	W/m²	Bird Clear Sky Model	Decomposition (DIRINT)
Clear-Sky Direct Normal Irradiance	$DNI_{clear}$	W/m²	Bird Clear Sky Model	Decomposition (DIRINT)
Clear-Sky Diffuse Horizontal Irradiance	$DHI_{clear}$	W/m²	Bird Clear Sky Model	Decomposition (DIRINT)

Derived Irradiance Parameters

Variable	Symbol	Units	Origin	Destination(s)
Relative	$AM$	—	Air Mass Model	Transposition (Perez)
Pressure-Corrected	$AM'$	—	Air Mass Model	• Decomposition (DIRINT) • Spectral Models
Precipitable Water	$W$	cm	Weather file or calculated from RH/T	Spectral Models
Spectral Correction Factor	$U_{spectr}$	—	Spectral Model	POA Irradiance adjustment

Tracker & Surface Orientation

Variable	Symbol	Units	Origin	Destination(s)
Tracker Rotation Angle	$\alpha$	degrees	True Tracking	• Backtracking • Irradiance Optimization
Backtracking Angle	$\alpha_B$	degrees	Standard Backtracking	Terrain-Aware Backtracking
Terrain-Corrected Angle	$\alpha_{TABT,i}$	degrees	Terrain-Aware Backtracking	Surface Orientation
Optimized Tracker Angle	$\alpha_{opt}$	degrees	Irradiance Optimization	Wind Stow / Surface Orientation
Commanded Tracker Angle	$\alpha_{final}$	degrees	Wind Stow	Surface Orientation
Module Tilt Angle	$\beta_m$	degrees	• Configuration • Tracking	• Transposition (view factors) • AOI Calculation
Module Azimuth Angle	$\gamma_m$	degrees	• Configuration • Tracking	AOI Calculation
Angle of Incidence	$\theta_{AOI}$	degrees	Geometry Calculation	• Transposition (beam) • IAM • Row-to-row shading

Plane-of-Array Irradiance Components

Variable	Symbol	Units	Origin	Destination(s)
Transposition Factor (Global)	$TF_{POA}$	—	3D Transposition	POA Irradiance adjustment
Transposition Factor (Beam)	$TF_{beam}$	—	3D Transposition	POA Irradiance adjustment
Transposition Factor (Sky Diffuse)	$TF_{sky}$	—	3D Transposition	POA Irradiance adjustment
Transposition Factor (Ground)	$TF_{ground}$	—	3D Transposition	POA Irradiance adjustment
Pre-Shading POA Irradiance (B/D/G)	—	W/m²	Transposition	Shading Models
Shaded POA Irradiance (B/D/G)	—	W/m²	Shading Models	Soiling
POA Irradiance After Soiling (B/D/G)	—	W/m²	Soiling Model	IAM
POA Irradiance After IAM (B/D/G)	—	W/m²	IAM Model	Effective POA
Front POA Irradiance	$G_{POA,front}$	W/m²	Transposition (sum of B/D/G)	• NOCT-SAM Temperature Model • Irradiance Optimization
Effective Front POA Irradiance (B/D/G)	$G_{POA,front,eff}$	W/m²	After All Adjustments	Effective POA Irradiance
Back POA Irradiance (B/D/G)	—	W/m²	Bifacial Model	Effective POA Irradiance
Effective POA Irradiance	$G_{POA,tot,eff}$	W/m²	Front + Back × Bifaciality	Single Diode Model

Loss/Adjustment Factors

Variable	Symbol	Units	Origin	Applied To
Horizon Shading Factor	$U_{horizon}$	—	Horizon Shading	Beam POA Irradiance
Beam Shading Factor	$U_{shd,B}$	—	Near Shading Models	Beam POA Irradiance
Sky Diffuse Shading Factor	$U_{shd,D}$	—	Diffuse Shading (view factors)	Sky Diffuse POA Irradiance
Ground Shading Factor	$U_{shd,G}$	—	Ground-Reflected Shading	Ground POA Irradiance
Electrical Shading Factor	$U_{shd,B,elec}$	—	Electrical Shading	Beam POA Irradiance
Soiling Factor	$U_{soil}$	—	Soiling Model	All POA Irradiance Components
Beam IAM Factor	$U_{IAM,B}$	—	IAM Model	Beam POA Irradiance
Sky Diffuse IAM Factor	$U_{IAM,D}$	—	IAM Model	Sky Diffuse POA Irradiance
Ground Diffuse IAM Factor	$U_{IAM,G}$	—	IAM Model	Ground POA Irradiance

Stage 2: DC Performance Variables

Module Temperature

Variable	Symbol	Units	Origin	Destination(s)
Cell Temperature	$T_c$	°C	Temperature Model	Single Diode Model
Module Surface Temperature	$T_m$	°C	Temperature Model	Output

DC System Losses & Parameter Translation

Variable	Symbol	Units	Origin	Destination(s)
Scaled Effective Irradiance	$G'_{POA,tot,eff}$	W/m²	DC System Losses	Parameter Translation
Series Resistance	$R_s$	Ω	Parameter Translation	Single Diode Model
Shunt Resistance	$R_{sh}$	Ω	Parameter Translation	Single Diode Model
Diode Ideality Factor	$\gamma$	—	Parameter Translation	Single Diode Model
Saturation Current	$I_0$	A	Parameter Translation	Single Diode Model
Photocurrent	$I_{ph}$	A	Parameter Translation	Single Diode Model

DC Power Outputs

Variable	Symbol	Units	Origin	Destination(s)
Open-Circuit Voltage	$V_{oc}$	V	Single Diode Model	• Inverter Region Model • Output
Short-Circuit Current	$I_{sc}$	A	Parameter Translation	Output
MPP Voltage	$V_{mp}$	V	Single Diode Model	Inverter Region Model
MPP Current	$I_{mp}$	A	Single Diode Model	Inverter Region Model
MPP Power	$P_{mp}$	W	$V_{mp} \times I_{mp}$	Inverter Region Model

Stage 3: Inverter Variables

Variable	Symbol	Units	Origin	Destination(s)
DC Open-Circuit Voltage	$V_{DC,oc}$	V	DC Field Aggregation	Inverter Region Model
DC Voltage (after clipping)	$V_{DC}$	V	Inverter Region Model	Inverter Efficiency Model
DC Operating Power	$P_{DC}$	W	Inverter Region Model	Inverter Efficiency Model
Degraded DC Power	$P_{DC,deg}$	W	DC Degradation Model	Inverter Region Model
DC Degradation Loss	$L_{deg}$	W	DC Degradation Model	Output
DC LeTID Loss	$L_{LeTID}$	W	DC Degradation Model	Output
Temperature-Corrected Max Power	$P_{AC,derated}$	W	Temperature Derating	Inverter Region Model
Inverter Efficiency	$\eta$	—	Inverter Efficiency Model	AC Power
Inverter AC Power	$P_{AC,inv}$	W	Inverter Efficiency Model	Inverter Aggregation

Stage 4: AC & Plant-Level Variables

Array Level

Variable	Symbol	Units	Origin	Destination
Array AC Power	$P_{AC,array}$	W	Inverter Aggregation	AC Degradation Model
Degraded AC Power	$P_{AC,deg}$	W	AC Degradation Model	Auxiliary Loads
AC Degradation Loss	$L_{deg}$	W	AC Degradation Model	Output
LeTID Loss	$L_{LeTID}$	W	LeTID Model	Output
Auxiliary Loads	$P_{aux}$	W	Cooling + Tracker + DAS	MV Transformer Model
MV Transformer Loss	$L_{MV,trans}$	W	MV Transformer Model	Output
Block Power	$P_{block}$	W	Array-Level Losses	Plant-Level Losses

Energy Storage (Optional)

Variable	Symbol	Units	Origin	Destination
PV MV Transformer Output	$P_{MV}$	W	Array-Level Losses	• Charge & Discharge Limits • Power Flow
PV Power After Availability	$P_{avail}$	W	Plant-Level Losses (PV-only)	• Charge & Discharge Limits • Dispatch Algorithms
HV Equipment Losses	$L_{HV}$	W	Plant-Level Losses (PV-only)	Charge & Discharge Limits
Charge Flag	$F_c$	boolean	Dispatch Algorithms	Battery Model
Discharge Flag	$F_d$	boolean	Dispatch Algorithms	Battery Model
Available Charge Power	$P_{charge}$	W	Charge & Discharge Limits	Battery Model
Available Discharge Power	$P_{discharge}$	W	Charge & Discharge Limits	Battery Model
State of Charge	$SOC$	Wh	Battery Model	Battery Model (feedback) / Output
Battery DC Power	$P_{DC,batt}$	W	Battery Model	Power Flow
DC RTE Loss	$L_{\eta}$	W	Battery Model	Output
Combined PV+ESS Power	$P_{combined}$	W	Power Flow	HV Transformer Model (re-run)

Plant Level

Variable	Symbol	Units	Origin	Destination
Plant Power	$P_{plant}$	W	Block Aggregation (or $P_{combined}$ )	HV Equipment
HV Transformer Loss	$L_{HV}$	W	HV Transformer Model	Transmission Model
Transmission Line Loss	$L_{line}$	W	Transmission Model	Availability
Power After HV Equipment	$P_{HV,out}$	W	HV Equipment Chain	Availability
Power After Availability	$P_{avail}$	W	Availability Model	LGIA Clipping
Grid Limit Clipping	$L_{LGIA}$	W	LGIA Clipping	Output
Grid Power	$P_{grid}$	W	LGIA Clipping	Output

Notes:

B/D/G: Beam, Diffuse, and Ground components are tracked and exported separately.
V12+: Some variables (e.g., Bay Fractions for electrical shading) are only available in Version 12 and later.
Aggregation: Power variables aggregate hierarchically: DC Field → Inverter → Array → Block → Plant.
Timestep Loop: All time-series variables are calculated for each timestep, then aggregated to hourly/daily/monthly/annual summaries.

General

1. Irradiance Calculation

2. Photovoltaic Conversion

3. DC Aggregation and DC–AC Conversion

4. AC Collection and Interconnection

5. Energy Storage

Variable Input-Output Table

External Inputs

Weather Data

Site Configuration

Other Time Series Inputs (Optional)

Model Parameters

Module Parameters (Single Diode Model)

Module Temperature Parameters

Inverter Parameters

DC Field & Loss Parameters

Transformer Parameters

AC System Parameters

DC Field Geometry

Tracking Control Parameters

Spectral Correction Parameters

Electrical Shading Parameters

IAM Parameters

ESS Parameters (Optional)

Stage 1: Irradiance Variables

Solar Position, Extraterrestrial, and Clear-Sky Irradiance

Derived Irradiance Parameters

Tracker & Surface Orientation

Plane-of-Array Irradiance Components

Loss/Adjustment Factors

Stage 2: DC Performance Variables

Module Temperature

DC System Losses & Parameter Translation

DC Power Outputs

Stage 3: Inverter Variables

Stage 4: AC & Plant-Level Variables

Array Level

Energy Storage (Optional)

Plant Level

​External Inputs

​Weather Data

​Site Configuration

​Other Time Series Inputs (Optional)

​Model Parameters

​Module Parameters (Single Diode Model)

​Module Temperature Parameters

​Inverter Parameters

​DC Field & Loss Parameters

​Transformer Parameters

​AC System Parameters

​DC Field Geometry

​Tracking Control Parameters

​Spectral Correction Parameters

​Electrical Shading Parameters

​IAM Parameters

​ESS Parameters (Optional)

​Stage 1: Irradiance Variables

​Solar Position, Extraterrestrial, and Clear-Sky Irradiance

​Derived Irradiance Parameters

​Tracker & Surface Orientation

​Plane-of-Array Irradiance Components

​Loss/Adjustment Factors

​Stage 2: DC Performance Variables

​Module Temperature

​DC System Losses & Parameter Translation

​DC Power Outputs

​Stage 3: Inverter Variables

​Stage 4: AC & Plant-Level Variables

​Array Level

​Energy Storage (Optional)

​Plant Level

External Inputs

Weather Data

Site Configuration

Other Time Series Inputs (Optional)

Model Parameters

Module Parameters (Single Diode Model)

Module Temperature Parameters

Inverter Parameters

DC Field & Loss Parameters

Transformer Parameters

AC System Parameters

DC Field Geometry

Tracking Control Parameters

Spectral Correction Parameters

Electrical Shading Parameters

IAM Parameters

ESS Parameters (Optional)

Stage 1: Irradiance Variables

Solar Position, Extraterrestrial, and Clear-Sky Irradiance

Derived Irradiance Parameters

Tracker & Surface Orientation

Plane-of-Array Irradiance Components

Loss/Adjustment Factors

Stage 2: DC Performance Variables

Module Temperature

DC System Losses & Parameter Translation

DC Power Outputs

Stage 3: Inverter Variables

Stage 4: AC & Plant-Level Variables

Array Level

Energy Storage (Optional)

Plant Level