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The SOL23 Direct Current (DC) Network Design Tool, developed within the Shift2DC project (WP2, Task T2.1), provides a methodology for the: Electrical sizing of DC networks (cross-section of cables, nominal power of converters) Performance evaluation (energy losses, voltage distribution, etc.) of DC networks. The tool addresses the lack of open-source solutions tailored to DC systems, offering functionalities for load flow (LF) analysis, component sizing, and Key Performance Indicator (KPI) assessment. It is particularly suited for Low Voltage Direct Current (LVDC) applications in data centers, buildings, industrial facilities, and ports, where DC networks can offer efficiency and reliability benefits. The deliverable is structured as follows: Chapter 1 introduces the tool and its scope, objectives, and requirements, emphasizing its role in the Shift2DC project. Chapter 2 presents the “Read me” of the tool. It details the installation steps, the file structure, the usage, the operational workflow, and the limitations of the tool. Chapter 3 outlines the input data structure of the tool, categorizing parameters essential for network modeling, load flow, and sizing. Chapter 4 describes the sizing methodology, highlighting the algorithm steps, including the load flow calculations. It also presents the time-step load flow under droop control as a key feature for performance evaluation. Chapter 5 presents the performance assessment methodology, focusing on energy, efficiency, and economic KPIs, which quantify the benefits of DC networks compared to Alternative Current (AC) alternatives. Chapter 6 presents the summary of the main findings and conclusions. The SOL23 tool is implemented in Python, leveraging power system modeling libraries such as pandapower, and is designed to be accessible to engineers and researchers without deep expertise in DC networks. Starting with a Technology Readiness Level (TRL) equal to 3, the developments aim to enhance its capabilities and usability, with a target TRL of 6. This deliverable serves as a comprehensive guide to the tool, providing a foundation for further refinement and application in real-world DC network design.