Planning calculator

AC shore power and generator load

Estimate continuous current, startup current, source VA and breaker margin from the loads you expect to run together.

System voltage (V)Continuous load (W)Additional startup/inrush load (W)Other startup load (W)Power factorPlanning marginBreaker or supply limit (A)

Load estimate

Continuous current

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Startup current

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Recommended source

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Breaker margin

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Estimated startup load: —

Safety note: Never bypass a breaker or RCD/GFCI to accommodate a calculated load. Generator and shore-power systems need correct earthing, transfer isolation, cable protection and local-code inspection.

Safety and limitations

This tool provides planning estimates only. It is not a substitute for a qualified design, inspection or local code compliance.
Use the exact manufacturer documentation for the equipment, materials, limits and installation method you intend to use. Do not select hardware from the result alone.
Verify every input, unit, operating condition, environmental limit and installation derating before relying on the result.
Protection devices, emergency controls and final commissioning must follow the manufacturer’s instructions and applicable local standards.
Electrical, gas, fuel, towing, structural and fire-safety work must be reviewed or completed by a suitably qualified professional where required.
This result does not include local approval, exact product compatibility, site-specific conditions, fault studies or commissioning measurements.

If any input is unknown, stop and obtain the datasheet or professional verification before purchasing or wiring components.