Travel & Transport

Campsite Power Load Budget Calculator

A campsite pedestal’s nominal watts are voltage multiplied by amperage, but continuous use should stay below the applicable circuit limit and motor loads can surge at startup. This calculator compares appliance demand with a user-set continuous-load share and adds one startup surge. It does not verify wiring, adapters, grounding, or code compliance.

Planning estimate only. Check measurements and real-world constraints before buying materials or making a commitment.

Last Updated: July 9, 2026

Calculate your scenario

Change any input. Results update immediately.

Supply voltageNominal pedestal voltage.VCircuit ratingBreaker or service rating.AContinuous-load planning shareUse the rule appropriate to the equipment and jurisdiction.%Total running appliance loadLoads expected to operate together.WLargest added startup surgeExtra watts above running load during startup.W

Your results

Continuous planning capacity

2,880 W

Based on the entered planning share.

Estimated startup peak

3,100 W

Running demand plus largest added surge.

Peak margin

-220 W

Reduce simultaneous loads.

How the calculation works

The calculator applies this relationship to the inputs above. Keep every measurement in the unit shown.

planning capacity = volts × amps × continuous-load share

Supply voltage120 V

Circuit rating30 A

Continuous-load planning share80 %

Total running appliance load2400 W

Largest added startup surge700 W

Worked example

Use this example to check the calculator by hand before relying on a result.

Find nominal power

Voltage times amperage gives nominal watts.

120 × 30 = 3,600 W

Apply 80% share

This is the continuous planning value.

3,600 × 0.80 = 2,880 W

Add startup surge

The peak exceeds the planning value by 220 watts.

2,400 + 700 = 3,100 W

Assumptions behind the result

• Voltage remains near nominal.
• Loads and surges are measured or reasonably estimated.
• Only one largest surge is added.
• Adapters do not increase circuit capacity.
• Electrical equipment is safe and approved.

Mistakes that change the answer

• Adding adapter ratings to create capacity.
• Ignoring air-conditioner or compressor startup.
• Confusing watt-hours with watts.

Questions about campsite power load budget calculator

Can a 30-amp adapter power a 50-amp RV fully?

No. An adapter changes the connection, not the available pedestal current. Manage loads within the actual supply.

Why add only one startup surge?

This model assumes the largest motor starts while other loads run. Simultaneous motor starts need a more conservative analysis.

Does this calculate battery runtime?

No. Runtime requires energy capacity in watt-hours, conversion losses, and a load profile over time.

What to calculate next

Luggage Weight Distribution Calculator Road Trip Rest Stop Time Calculator Fuel Range Reserve Buffer Calculator

Calculator methods and editorial structure reviewed July 11, 2026. Results are estimates; verify regulated rates, eligibility rules, and professional decisions with the cited primary source.