Marina electrical calculations, from one dock panel to multiple substations.
Coordinate shore-power demand, pedestal circuits, boat lifts, other marina loads, distribution equipment, schedules, vertical one-lines, and complete PDF reports in one project.
Built around the real workflow
Marina projects rarely stop at a single demand total. Pedestal combinations, looped feeders, conductor sizing, boat lifts, landside loads, phase loading, schedules, and one-lines 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.
55-second product walkthrough
Full-frame captures from the current application show the project and distribution screens, per-circuit sub-meter controls, the complete seven-step workflow, and the optional Branded Reports add-on without cropping tables, schedules, or diagrams.
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
Define the upstream connection, source distance, panel, pedestal circuits, receptacle layouts, wiring methods, conductor materials, boat lifts, and other marina loads.
Multi Panel Marina
Configure the low-voltage MDP or switchboard, add dock panels, assign pedestal, boat-lift, and other loads, 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 downstream 120/240V pedestal, boat-lift, and other-load calculations.
Actual application screens
Every image below is built from the current ShorePowerCalc 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.
Record project metadata, select the NEC calculation basis, and choose the marina distribution mode.
Add the source, MDP, panels, or substations and establish the equipment hierarchy.
Assign equipment, receptacle combinations, circuit IDs, distances, materials, and wiring methods.
Model motor loads, controller supplies, service receptacles, simultaneity, conductors, and actual OCPD.
Include lighting, buildings, pumps, controls, security, EV charging, and user-calculated branches.
Start with warnings, then inspect demand, sizing, phase loading, feeders, branches, and schedules.
Review the tagged vertical one-line, retain the .mlc project, and export the complete standard PDF report.
See the finished work
The sample PDF shows the standard report a customer can export from ShorePowerCalc, including project metadata, calculation summaries, schedules, equipment hierarchy, one-line diagrams, notes, and assumptions.
Optional Branded Reports add-on
The separately licensed add-on applies your company name, contact information, credential, tagline, logo, and report colors to supported PDF presentation and metadata. It does not change the ShorePowerCalc interface or calculation workflow.
$59.99 one-time add-onRequires an active ShorePowerCalc base license and a separate Gumroad key.
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.
Current release
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.
The version history lists the current release and the calculation, reporting, activation, and workflow changes included in each public update.
No. The base license exports standard ShorePowerCalc reports. Customer branding requires the separate Branded Reports add-on, an active ShorePowerCalc base license, and a second Gumroad license key purchased with the same customer email.
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 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 through Gumroad and download both Windows builds, the 37-page user guide, and supporting files.
