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REopt Lite User Guides

Learn more about the REopt Lite™ web tool from the following user guides, including a detailed user manual, user forum, tutorials, and recorded webinars.

User Manual

The REopt Lite Web Tool User Manual provides an in-depth review of the tool, intended users and use cases, and instructions on how to get started. The user manual also contains details about the tool's data inputs, results, default values, and links to additional technical references.

User Forum

The REopt Lite User Forum contains frequently asked questions about using the REopt Lite web tool. You can browse and search discussions by topic and sign in to join discussions, ask new or follow-up questions, and leave comments and feedback.

Tutorials and Webinars

Quick-start video and fact sheet tutorials guide users through REopt Lite web tool inputs and results, and the REopt Lite application programming interface (API) and Open Source software. View the full REopt Lite Tutorial video playlist.

Overview of Tool Inputs

Learn how to choose an analysis focus, enter site data, and select a technology to evaluate in the REopt Lite web tool.

Watch the Tool Inputs Overview video.

Download the Tool Inputs Overview fact sheet.

Custom Load Profile Inputs

Learn how to add and customize load profile inputs in the REopt Lite web tool.

Watch the Custom Load Profile Inputs video.

Download the Custom Load Profile Inputs fact sheet.

Advanced Utility Rate Inputs

Learn how to customize advanced utility rate inputs in the REopt Lite web tool.

Watch the Advanced Utility Rate Inputs video.

Download the Advanced Utility Rate Inputs fact sheet.

Resilience Inputs

Learn how to enter data for a resilience modeling analysis in the REopt Lite web tool.

Watch the Resilience Inputs video.

Download the Resilience Inputs fact sheet.

Financial Analysis Results

This tutorial explains the financial modeling analysis outputs of the REopt Lite web tool.

Watch the Financial Outputs video.

Download the Financial Outputs fact sheet.

Utility Rate Analysis

Use REopt Lite to perform a utility rate analysis that compares the life cycle electricity costs of available utility rates at a given site.

Download the Utility Rate Analysis fact sheet.

Resilience Analysis Results

Learn about the resilience modeling outputs of the REopt Lite web tool.

Watch the Resilience Outputs video.

Download the Resilience Outputs fact sheet.

API Overview

Embed REopt Lite into your own applications for dynamic analysis using the Application Programming Interface, or API.

Watch the API Overview video.

Open Source Software

Learn how to access REopt Lite Open Source and explore the source code, build custom capabilities, and contribute new models.

Watch the Introduction to REopt Lite Open Source webinar.

International Locations

Learn how to make adjustments in the REopt Lite web tool's inputs to run analyses for international locations.

Download the International Locations fact sheet.

Recorded webinars explore REopt Lite features and functionality.

Designing Hybrid Combined Heat and Power Systems: An Introduction to New Features in NREL’s REopt Lite Tool
Clean Energy Group Resilient Power Project webinar, Mar. 2, 2021

Energy Master Planning for Resilient Public Communities
National Academies of Sciences Federal Facilities Council workshop, Oct. 13–16, 2020

Introduction to REopt Lite Open Source
NREL webinar, Mar. 17, 2020

Save Money and Build Resilience with Distributed Energy Technologies
DOE Better Buildings webinar, Feb. 4, 2020

Designing Solar+Storage to Power Critical Loads: An Introduction to New Resilient Power Features in NREL's REopt Lite Tool
Clean Energy Group Resilient Power Project webinar, Feb. 21, 2019

Simplifying Resilient Power Design with REopt Lite: A Look at New Features Added to NREL's Solar+Storage Tool
Clean Energy Group Resilient Power Project webinar, July 25, 2018

REopt Lite: Sizing Solar+Storage for Savings and Resiliency with NREL's New Tool
Clean Energy Group Resilient Power Project webinar, Nov. 1, 2017