Marina shore-power calculations, from one dock panel to multiple substations.
Build demand calculations, pedestal and boat-lift loads, feeder sizing, schedules, one-lines, and complete PDF reports from one organized project file.
Built around the real workflow
Marina projects rarely stop at a single demand total. Pedestal combinations, looped feeders, conductor sizing, boat lifts, phase loading, schedules, and one-line notes all have to stay coordinated as the design changes.
ShorePowerCalc keeps those inputs and outputs in one Windows project so revisions move through the calculation package instead of being re-entered across separate spreadsheets and drawings.
Three project modes
Start with a single dock panel, organize multiple low-voltage dock panels, or model a 480/277V landside MDP feeding marine substations.
Single Panel Marina
Enter the source, panel, pedestal circuits, receptacle layouts, distances, wiring methods, conductor materials, and optional boat-lift loads.
Multi Panel Marina
Configure the low-voltage MDP or switchboard, add dock panels, develop each panel's pedestal circuits, and calculate the upstream distribution from the same project.
Large MDP & Substation Marina
Build a 480/277V landside MDP, add 480V single-phase marine substations, and retain the downstream 120/240V pedestal-panel calculations.
Actual v2.0 screens
Every image below is built from the current ShorePowerCalc v2.0 application, not a concept mockup.
One organized path
The app keeps source data, downstream circuits, calculations, schedules, and diagrams tied to the selected project mode.
Name the project, select the NEC calculation basis, and choose the marina distribution mode.
Add panels or substations, pedestal circuits, receptacle layouts, distances, and wiring methods.
Include boat-lift motors, accessory receptacles, looped circuits, and simultaneous-operation assumptions.
Inspect demand, sizing, phase loading, schedules, warnings, one-lines, and assumptions.
Retain the .mlc project for revisions and generate the complete PDF calculation report.
See the finished work
The sample PDF shows the format a customer can export from ShorePowerCalc, including calculation summaries, schedules, one-line diagrams, notes, and assumptions.
Who it is for
Develop and revise marina load-calculation packages without rebuilding separate schedules and one-lines by hand.
Organize the calculation basis, distribution hierarchy, panel loading, feeders, and report information in one project.
Document existing or proposed pedestal arrangements for review with qualified electrical professionals and project stakeholders.
Important: ShorePowerCalc is an informational calculation aid. It is not a licensed engineer and does not produce sealed, permit-ready, or construction-ready documents. All outputs require independent review and approval by the appropriate qualified professionals, utility, manufacturer, and AHJ.
ShorePowerCalc v2.0.0
One named user on one Windows computer. The license runs for 365 days from the original Gumroad purchase date.
Purchase securely on GumroadGumroad handles payment, receipt, license key, and download delivery.
Know before purchase
Questions before purchase
More installation and activation details are available on the support page.
Version 2.0 adds Multi Panel Marina and Large MDP & Substation Marina workflows alongside the original Single Panel mode. It also includes expanded boat-lift motor loads, upstream feeder reviews, phase loading, project-wide schedules, revised one-lines, and combined PDF reports.
No. ShorePowerCalc is a calculation aid. It does not exercise engineering judgment or create sealed construction documents. Final inputs, assumptions, equipment selections, code application, and outputs must be independently reviewed for the specific project and jurisdiction.
Normal project data is stored locally, but internet access is required for first activation and periodic license checks. Do not describe the app as permanently offline because continued license verification is part of the customer build.
Setup installs ShorePowerCalc for the current Windows user and creates normal shortcuts. Portable runs directly from its folder without a conventional installation. Both include the same v2.0 application and use the same license.
The license term begins on the original Gumroad purchase date. Delayed activation, reinstalling, or moving to a replacement computer does not restart the term.
The app provides 2023 and 2026 marina demand calculation bases. Always confirm the edition adopted for the project, local amendments, utility requirements, and AHJ direction before relying on any result.
Build the project once
Purchase ShorePowerCalc v2.0.0 through Gumroad and download both Windows builds, the user guide, and supporting files.
