> ## Documentation Index
> Fetch the complete documentation index at: https://docs.plantpredict.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Losses

> Configure DC losses including module quality, mismatch, wiring losses, and thermal model parameters

The Losses page allows you to specify DC-side losses for the DC Field, including module quality factors, mismatch losses, wiring losses, and thermal model parameters. These inputs directly affect energy yield calculations by accounting for real-world inefficiencies in the DC system.

<Frame caption="DC Field - Losses (Bifacial Losses, SunSolve import off)">
  <img src="https://mintcdn.com/terabaseenergy/BZq7yMM4x1OhD5lk/images/power-plant-builder-dc-field-losses-bifacial-ui.png?fit=max&auto=format&n=BZq7yMM4x1OhD5lk&q=85&s=26305e32cbaec543f780df947a855ab8" alt="DC Field Losses tab with Bifacial Losses: SunSolve Bifacial Parameters Import off, Structure Shading, and Backside Mismatch" width="1024" height="678" data-path="images/power-plant-builder-dc-field-losses-bifacial-ui.png" />
</Frame>

<Frame caption="Bifacial Losses with SunSolve Bifacial Parameters Import enabled">
  <img src="https://mintcdn.com/terabaseenergy/BZq7yMM4x1OhD5lk/images/power-plant-builder-dc-field-losses-sunsolve-bifacial-on-ui.png?fit=max&auto=format&n=BZq7yMM4x1OhD5lk&q=85&s=87b325d4b6aa67f9c83013b86b22f2dc" alt="Bifacial Losses with SunSolve import on: SunSolve Structure Shading, Combined Front + Back Mismatch, and Transmission Gain" width="628" height="226" data-path="images/power-plant-builder-dc-field-losses-sunsolve-bifacial-on-ui.png" />
</Frame>

## Overview

The DC Field - Losses page is organized into the following sections:

1. **DC Field Header** — Shows the DC Field identifier with Edit, Clone, and Remove buttons.
2. **Tab Navigation** — Access different aspects of DC Field configuration: Table, Field, Losses, and Objects.
3. **DC Losses** — Configure percentage-based losses for module quality, mismatch, degradation, wiring, and health factors, plus tracker power consumption.
4. **Thermal Losses** — Configure the module temperature model including heat balance parameters and temperature coefficients.
5. **Bifacial Losses** — Standard structure shading and backside mismatch inputs, or optional [SunSolve](https://www.sunsolve.com/)-style parameters when **SunSolve Bifacial Parameters Import** is enabled (see [rear irradiance](/models/poa-irradiance/rear_irradiance)).
6. **Surface Temperature Time Series** — Enable custom time series data for module surface temperature.
7. **DC Field Visualization** — Preview of the field layout for reference.

***

## User Inputs

<table>
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  </colgroup>

  <thead>
    <tr>
      <th>#</th>
      <th>Input</th>
      <th>Type</th>
      <th>Units</th>
      <th>Description</th>
      <th>Related Documentation</th>
    </tr>
  </thead>

  <tbody>
    <tr>
      <td>**1**</td>
      <td>**Block** (Hierarchy)</td>
      <td>Button</td>
      <td>—</td>
      <td>Toggle view to show the Block-level hierarchy bar displaying system summary: MWdc, MWac, DC:AC ratio, GCR, Array Count, and Inverter Count.</td>
      <td>[Block Overview](/user-guide/ui/power-plant-builder-block)</td>
    </tr>

    <tr>
      <td>**2**</td>
      <td>**Table** (Tab)</td>
      <td>Tab</td>
      <td>—</td>
      <td>Navigate to the Table tab to configure module selection, mounting type, and table geometry.</td>
      <td>[Table](/user-guide/ui/power-plant-builder-dc-field-table)</td>
    </tr>

    <tr>
      <td>**3**</td>
      <td>**Field** (Tab)</td>
      <td>Tab</td>
      <td>—</td>
      <td>Navigate to the Field tab to configure string count, layout arrangement, terrain, and field-level settings.</td>
      <td>[Field](/user-guide/ui/power-plant-builder-dc-field-field)</td>
    </tr>

    <tr>
      <td>**4**</td>
      <td>**Losses** (Tab)</td>
      <td>Tab</td>
      <td>—</td>
      <td>Currently selected tab. Contains DC loss factors and thermal model configuration.</td>
      <td>—</td>
    </tr>

    <tr>
      <td>**5**</td>
      <td>**Objects** (Tab)</td>
      <td>Tab</td>
      <td>—</td>
      <td>Navigate to the Objects tab to configure near-field shading objects specific to this DC Field (legacy workflow).</td>
      <td>[Objects](/user-guide/ui/power-plant-builder-dc-field-objects)</td>
    </tr>

    <tr>
      <td>**6**</td>
      <td>**Module Quality**</td>
      <td>Text Field</td>
      <td>%</td>
      <td>Percentage loss due to module manufacturing quality variation from nameplate rating. Positive values indicate underperformance relative to rated power.</td>
      <td>[DC Losses](/models/dc-performance/dc_system_losses)</td>
    </tr>

    <tr>
      <td>**7**</td>
      <td>**Mismatch**</td>
      <td>Text Field</td>
      <td>%</td>
      <td>Percentage loss due to electrical mismatch between modules in a string or array. Accounts for variations in module I-V characteristics.</td>
      <td>[DC Losses](/models/dc-performance/dc_system_losses)</td>
    </tr>

    <tr>
      <td>**8**</td>
      <td>**Light Induced Degradation**</td>
      <td>Text Field</td>
      <td>%</td>
      <td>Percentage loss from initial light-induced degradation (LID) that occurs in the first hours of module operation. Applies primarily to crystalline silicon modules.</td>
      <td>[DC Losses](/models/dc-performance/dc_system_losses)</td>
    </tr>

    <tr>
      <td>**9**</td>
      <td>**DC Wiring at STC**</td>
      <td>Text Field</td>
      <td>%</td>
      <td>Percentage loss in DC wiring and connections at Standard Test Conditions (STC). Includes string wiring, combiner boxes, and DC home runs.</td>
      <td>[DC Losses](/models/dc-performance/dc_system_losses)</td>
    </tr>

    <tr>
      <td>**10**</td>
      <td>**DC Health**</td>
      <td>Text Field</td>
      <td>%</td>
      <td>Percentage loss representing ongoing DC system degradation and health issues not captured by other loss categories. Can be used for aging adjustments.</td>
      <td>[DC Losses](/models/dc-performance/dc_system_losses)</td>
    </tr>

    <tr>
      <td>**11**</td>
      <td>**Tracker Actuator Load**</td>
      <td>Text Field</td>
      <td>MWh/MWp/Year</td>
      <td>Annual energy consumption of tracker motors and actuators, expressed per MWp of DC capacity. Only applicable to tracker-mounted systems.</td>
      <td>—</td>
    </tr>

    <tr>
      <td>**12**</td>
      <td>**Module Temperature**</td>
      <td>Dropdown</td>
      <td>—</td>
      <td>Select the module temperature calculation method. Options: **Heat Balance**, **Sandia**, **NOCT**.</td>
      <td>[Module Temperature](/models/dc-performance/overview#cell-temperature-models)</td>
    </tr>

    <tr>
      <td>**13**</td>
      <td>**Cell to Module Temp. Difference**</td>
      <td>Text Field</td>
      <td>°C / °F</td>
      <td>Temperature offset between the module backsheet (measured) and cell junction temperature. Accounts for thermal resistance within the module.</td>
      <td>[Module Temperature](/models/dc-performance/overview#cell-temperature-models)</td>
    </tr>

    <tr>
      <td>**14**</td>
      <td>**Conductive Coefficient**</td>
      <td>Text Field</td>
      <td>Uc</td>
      <td>Conductive heat transfer coefficient (Uc) for the heat balance model. Represents constant heat loss independent of wind speed.</td>
      <td>[Module Temperature](/models/dc-performance/overview#cell-temperature-models)</td>
    </tr>

    <tr>
      <td>**15**</td>
      <td>**Convective Coefficient**</td>
      <td>Text Field</td>
      <td>Uv</td>
      <td>Convective heat transfer coefficient (Uv) for the heat balance model. Represents wind-dependent heat loss; multiplied by wind speed in the thermal calculation.</td>
      <td>[Module Temperature](/models/dc-performance/overview#cell-temperature-models)</td>
    </tr>

    <tr>
      <td>**16**</td>
      <td>**Enable Time Series Data**</td>
      <td>Checkbox</td>
      <td>—</td>
      <td>When enabled, allows import of custom module surface temperature time series data instead of using the calculated thermal model.</td>
      <td>—</td>
    </tr>

    <tr>
      <td>**17**</td>
      <td>**SunSolve Bifacial Parameters Import**</td>
      <td>Toggle</td>
      <td>—</td>
      <td>When **ON**, PlantPredict uses the SunSolve-style inputs below and applies the rear-irradiance adjustment documented for SunSolve import on [Rear (bifacial) plane-of-array irradiance](/models/poa-irradiance/rear_irradiance) (for example, combined front + back mismatch overrides the **Mismatch** value in **General DC Losses**, and transmission-related handling follows the in-app tooltips). When **OFF**, use **Structure Shading** and **Backside Mismatch** in this section.</td>
      <td>[Rear (bifacial) plane-of-array irradiance](/models/poa-irradiance/rear_irradiance)</td>
    </tr>

    <tr>
      <td>**18**</td>
      <td>**Structure Shading**</td>
      <td>Text Field</td>
      <td>%</td>
      <td>Rear-side loss from structure shading. Shown when **SunSolve Bifacial Parameters Import** is **OFF**.</td>
      <td>[Rear (bifacial) plane-of-array irradiance](/models/poa-irradiance/rear_irradiance)</td>
    </tr>

    <tr>
      <td>**19**</td>
      <td>**Backside Mismatch**</td>
      <td>Text Field</td>
      <td>%</td>
      <td>Mismatch on the back side. Shown when **SunSolve Bifacial Parameters Import** is **OFF**.</td>
      <td>[Rear (bifacial) plane-of-array irradiance](/models/poa-irradiance/rear_irradiance)</td>
    </tr>

    <tr>
      <td>**20**</td>
      <td>**SunSolve Structure Shading**</td>
      <td>Text Field</td>
      <td>%</td>
      <td>Shown when **SunSolve Bifacial Parameters Import** is **ON** (0–100%).</td>
      <td>[Rear (bifacial) plane-of-array irradiance](/models/poa-irradiance/rear_irradiance)</td>
    </tr>

    <tr>
      <td>**21**</td>
      <td>**SunSolve Combined Front + Back Mismatch**</td>
      <td>Text Field</td>
      <td>%</td>
      <td>Shown when **SunSolve Bifacial Parameters Import** is **ON** (0–100%). Overrides the **Mismatch** value under **General DC Losses** while import is on.</td>
      <td>[Rear (bifacial) plane-of-array irradiance](/models/poa-irradiance/rear_irradiance)</td>
    </tr>

    <tr>
      <td>**22**</td>
      <td>**SunSolve Transmission Gain**</td>
      <td>Text Field</td>
      <td>%</td>
      <td>Shown when **SunSolve Bifacial Parameters Import** is **ON** (0–100%). System-level gain applied in the rear-irradiance model; use the in-app info tooltip to avoid double-counting with module-level transmission settings.</td>
      <td>[Rear (bifacial) plane-of-array irradiance](/models/poa-irradiance/rear_irradiance)</td>
    </tr>

    <tr>
      <td>**23**</td>
      <td>**Advanced 3D Design**</td>
      <td>Button</td>
      <td>—</td>
      <td>Opens the advanced 3D design interface for detailed field layout customization, including individual row placement and terrain modeling.</td>
      <td>[3D Shading](/models/shading/3d_shading_dc_field)</td>
    </tr>
  </tbody>
</table>

***

## Saving Changes

Click **Save Power Plant** in the top-right corner to save all DC Field configuration changes and return to the [Block Overview](/user-guide/ui/power-plant-builder-block). Click the **X** button to cancel and discard changes.