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30 Amp RV Shore Power Calculator

Estimate the running current of AC devices used together on a North American 30 A RV shore connection. Enter each device’s running amps, or its real watts with operating voltage and power factor. The result shows how the combined load compares with 30 A.

Not sure what to enter? Read the step-by-step guide.

Your inputs

AC load 1

Use running AC input amps for a 120 V device. If entering watts, use real AC input power, operating voltage and the actual power factor. Do not use VA as watts; dividing watts by volts alone assumes a power factor of 1.

Include every AC load drawing from shore power at the same time, including the battery charger if active. Use its AC input current, not DC battery current. Inputs stay in this browser.

30A shore power comparison

How your running loads compare

Combined running current compared with the 30 A connection rating.

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Current by device

    Enter the AC devices that may run together on this 30 A shore connection.

    This compares running current with the 30 A connection rating. It does not predict breaker trips, motor startup current, long-duration load rules, voltage drop, individual receptacle/circuit limits, or whether a specific RV and pedestal are safe to use. Check their ratings and applicable guidance separately.

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    See calculation details, assumptions and sources

    A TT-30 RV shore connection is a single-phase 30 A, 120/125 V class connection. For each device, use its running RMS AC current. If only real running power is known, amps = real W ÷ (RMS V × power factor) for a single-phase AC load. Multiply by the number of devices and add all loads running together: total shore A = Σ(quantity × device A). Compare that total directly with 30 A; the difference is 30 A − total shore A.

    For example, one air conditioner drawing 12 A, a charger drawing 8 A AC input, and two lights drawing 1 A each total 22 A. That is 8 A below the 30 A rating. For a 960 W real AC load at 120 V and PF 0.8, the estimated running current is 960 ÷ (120 × 0.8) = 10 A. Watts alone cannot identify AC current when PF is unknown.

    The result is a running-current comparison only. A value below 30 A does not prove that motor startup will avoid a breaker trip, that a smaller RV branch circuit can carry its own load, or that the connection can sustain a given duration. No blanket 80% factor, startup multiplier, or power-assist contribution is assumed. A 50 A RV connection has two legs; use the 50 A calculator to compare them separately.

    References: Hubbell TT-30R specification identifies the 30 A single-phase RV connection; Victron Energy Meter manual distinguishes real W from RMS V × A when power factor differs from one. See the site methodology.