About ShorePowerCalc

ShorePowerCalc is a Windows‑based marina shore‑power load calculator built around the 2023 National Electrical Code (Articles 555 & 220). It supports 120/240 V single‑phase and 120/208 V three‑phase services, with all pedestal locations currently treated as single‑phase at the selected voltage. The tool automates marina load calculations by generating demand loads, breaker and conductor sizes, panel schedules and one‑line diagrams eliminating guesswork so you can focus on design and compliance.

Instant Load Sizing

Enter your project and pedestal details to instantly calculate total demand load, demand current, breaker size and service conductor requirements.

Auto‑Generated Schedules

ShorePowerCalc produces detailed panel schedules with circuit IDs, volt‑amps per phase, breaker ratings, voltage drop and wire specifications.

One‑Line Diagrams

Generate professional one‑line diagrams and export them as PDFs for permit submittals and stakeholder presentations.

Offline & Secure

Work entirely on Windows 10/11 without an internet connection. Save and reopen your .mlc project files to keep your data private, and choose between a full installer with Start Menu shortcuts or a portable executable that runs from any folder without admin rights.

Comprehensive Inputs

Capture every critical design parameter, project names, addresses, panel names, distances, voltages, wire materials, ambient temperatures and sub‑meter options in a single, intuitive form.

Save & Export

Save your projects for later editing or review, and export the final panel schedules and one‑line diagrams as clean, professional PDFs for your documentation.

App Screenshots

Get a glimpse of ShorePowerCalc in action. Click any image to view a larger version.

Project information screen — Start your design by entering the project name, address, panel name, distances, voltage and other essentials.

Initial circuit details screen — Add and manage circuits in the Pedestal Circuit Details table. Set installation types, wire materials, distances and more.

Filled circuit details with demand factors — Populate both sides of the pedestal with receptacles and see how ShorePowerCalc automatically calculates total receptacles and demand factors.

Panel schedule summary — Review the computed panel schedule including breakers, distances, wire sizes, materials, conduit sizes and demand summary.

One‑line diagram — Visualize your design in a concise one‑line diagram showing connections between panel and pedestals along with conductor sizes and breakers.

Export PDF button — When you’re satisfied, export the results to a PDF document for sharing or printing.

What's Included

ShorePowerCalc Setup 1.2.5 (Windows installer)
ShorePowerCalc‑1.2.5 (portable executable—no installation required)
INSTALL_ShorePowerCalc.txt (step‑by‑step installation guide)
ShorePowerCalc User Guide v1.2.5 (illustrated instructions)
SHA256SUMS.txt (optional integrity checks)

Frequently Asked Questions

Is there a Mac version?

ShorePowerCalc is currently available for Windows 10/11.

Setup vs. portable?

The Setup version installs ShorePowerCalc with Start Menu shortcuts. The portable version runs directly from any folder without requiring installation or admin rights.

Is ShorePowerCalc code compliant?

ShorePowerCalc is an engineering aid based on our interpretation of NEC Articles 555 and 220. Always verify calculations with an engineer, local codes and authorities having jurisdiction.