DC Field Nodal Data

Detailed parameters in the DC Field nodal data export

The DC Field nodal data provides the most granular level of prediction results, containing timestep data for irradiance processing, shading, module temperature, and DC electrical performance for each DC field in the power plant.

Description of Nodal Data Parameters

Parameter	Units	Description
Timestamp	yyyy-MM-dd HH:mm:ss	Date and time for the calculation timestep
Sun Zenith Angle	°	Angle between the sun and the vertical (zenith), where 0° is directly overhead and 90° is at the horizon
Sun Azimuth Angle	°	Compass direction of the sun measured clockwise from north
Tracker Angle	°	Current rotation angle of the tracker, applicable for single-axis tracking systems
Module Tilt Angle	°	Angle of the module surface relative to horizontal, accounting for tracker position if applicable
Module Azimuth Angle	°	Compass direction the module surface faces, measured clockwise from north
Incidence Angle	°	Angle between the sun’s direct beam and the normal to the module surface
Beam POAI	W/m²	Direct beam component of plane-of-array irradiance before any corrections or losses
Diffuse POAI	W/m²	Diffuse sky component of plane-of-array irradiance before any corrections or losses
Ground POAI	W/m²	Ground-reflected component of plane-of-array irradiance before any corrections or losses
Global POAI	W/m²	Total plane-of-array irradiance (beam + diffuse + ground) before any corrections or losses
3D Corrected Beam POAI	W/m²	Direct beam POAI after applying 3D transposition correction factors
3D Corrected Diffuse Sky POAI	W/m²	Diffuse sky POAI after applying 3D transposition correction factors
3D Corrected Ground POAI	W/m²	Ground-reflected POAI after applying 3D transposition correction factors
3D Corrected Global POAI	W/m²	Total POAI after applying 3D transposition correction factors, sum of 3D corrected components
Horizon Shaded Beam POAI	W/m²	Direct beam POAI after applying horizon shading losses
Horizon Shaded Diffuse POAI	W/m²	Diffuse sky POAI after applying horizon shading losses
Horizon Shaded Ground POAI	W/m²	Ground-reflected POAI after applying horizon shading losses
Horizon Shaded Global POAI	W/m²	Total POAI after horizon shading, sum of horizon-shaded components
Near Shaded Beam POAI	W/m²	Direct beam POAI after applying near (inter-row) shading losses
Near Shaded Diffuse POAI	W/m²	Diffuse sky POAI after applying near shading losses
Near Shaded Ground POAI	W/m²	Ground-reflected POAI after applying near shading losses
Near Shaded Global POAI	W/m²	Total POAI after near shading, sum of near-shaded components
Beam POAI After Soiling	W/m²	Direct beam POAI after applying soiling losses
Diffuse POAI After Soiling	W/m²	Diffuse sky POAI after applying soiling losses
Ground POAI After Soiling	W/m²	Ground-reflected POAI after applying soiling losses
Global POAI After Soiling	W/m²	Total POAI after soiling losses, sum of soiled components
Beam POAI After IAM	W/m²	Direct beam POAI after applying incidence angle modifier losses
Diffuse POAI After IAM	W/m²	Diffuse sky POAI after applying incidence angle modifier losses
Ground POAI After IAM	W/m²	Ground-reflected POAI after applying incidence angle modifier losses
Global POAI After IAM	W/m²	Total POAI after IAM losses, sum of IAM-corrected components
Beam IAM Factor	%	Incidence angle modifier factor for direct beam irradiance
Diffuse IAM Factor	%	Incidence angle modifier factor for diffuse irradiance
Ground IAM Factor	%	Incidence angle modifier factor for ground-reflected irradiance
Effective Beam POAI	W/m²	Final effective direct beam POAI after all irradiance losses including spectral correction
Effective Diffuse POAI	W/m²	Final effective diffuse sky POAI after all irradiance losses including spectral correction
Effective Ground POAI	W/m²	Final effective ground-reflected POAI after all irradiance losses including spectral correction
Effective Global POAI	W/m²	Final effective total POAI used for DC power calculation, sum of effective components
Global Tilted Direct Beam Irradiance w/ Electrical Shading	W/m²	Direct beam POAI with electrical shading factor applied, used for electrical mismatch calculations
Beam Shading Factor	—	Fraction of direct beam irradiance remaining after geometric shading (1.0 = no shading)
Diffuse Shading Factor	—	Fraction of diffuse irradiance remaining after geometric shading
Ground Shading Factor	—	Fraction of ground-reflected irradiance remaining after geometric shading
Beam Electrical Shading Factor	—	Fraction of direct beam irradiance remaining after electrical shading effects
DC Power at STC	W	Aggregate DC power output of the DC field calculated at standard test conditions (1000 W/m², 25°C cell temperature)
DC Power at 25C	W	DC field power output at actual irradiance but with cell temperature fixed at 25°C, used to isolate temperature effects
Module Irradiance	W	Total irradiance power incident on module area, calculated as effective global POAI multiplied by module area
DC Power Lost due to Electrical Shading	W	Power loss attributed to electrical mismatch from partial shading conditions
DC Power Lost due to Module Quality	W	Power loss from module quality/binning deviation from nameplate specifications
DC Power Lost due to LID	W	Power loss from light-induced degradation effects
DC Power Lost due to Module Mismatch	W	Power loss from electrical mismatch between modules in the DC field
Backside Irradiance	W	Total irradiance incident on the rear side of bifacial modules
Structure Shading Loss	W	Power loss from mounting structure shading on the rear of bifacial modules
DC Power Lost due to DC Health	%	Percentage power loss applied to account for DC system health factors
Ohmic Power Loss	W	Resistive power losses in DC wiring between modules and inverter input
Cell Temperature at MPP	°C	Module cell temperature calculated for maximum power point operating conditions
Cell Temperature at Open Circuit	°C	Module cell temperature calculated for open circuit voltage conditions
Module Surface Temperature	°C	Temperature of the module back surface
Open Circuit DC Voltage at MPP Cell Temperature	V	DC field open circuit voltage calculated using cell temperature at MPP conditions
Open Circuit DC Voltage at Open Circuit Cell Temperature	V	DC field open circuit voltage calculated using cell temperature at open circuit conditions
DC Voltage at MPP	V	DC field voltage at the maximum power point before inverter limitations
Short Circuit Current	A	DC field short circuit current at operating conditions
3hr Rolling Avg DC String Short Circuit Current	A	Three-hour rolling average of DC string short circuit current, used for fuse sizing validation
DC Current at MPP	A	DC field current at the maximum power point before inverter limitations
DC Power at MPP	W	DC field power at the maximum power point before inverter limitations
DC Voltage	V	Final DC field operating voltage after inverter operating point adjustment
DC Current	A	Final DC field operating current after inverter operating point adjustment
DC Power	W	Final DC power delivered to the inverter input, calculated as DC Voltage × DC Current
Spectral Shift Factor	—	Spectral correction factor applied to account for atmospheric spectral variations from reference spectrum
Global Back POAI	W/m²	Total plane-of-array irradiance on the rear side of bifacial modules
Ave Ground GHI	W/m²	Average global horizontal irradiance on the ground beneath the array, used in bifacial calculations
Effective Global Back POAI	W/m²	Final effective rear-side POAI after all losses, used for bifacial power contribution
Effective Back POAI Lost due to BiFaciality	W/m²	Rear-side POAI reduction from bifaciality factor application
DC Power Lost due to Back Mismatch	W	Power loss from rear-side irradiance mismatch in bifacial modules