RV Automatic Transfer Switches: When to Keep Them and When to Remove Them

An RV automatic transfer switch allows two AC power sources, usually shore power and an onboard generator, to connect to the RV while only letting one source supply power at a time.

If shore power goes out, you can start the generator without unplugging your RV from the pedestal. The transfer switch detects the available source and sends that power into the RV electrical system.

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When Do We Keep the Transfer Switch?

When installing a Victron MultiPlus inverter, we usually keep the existing transfer switch if the RV has both shore power and a working onboard generator. The transfer switch selects the power source before sending it to the inverter.

Because the MultiPlus has one AC input, it does not need to know whether the incoming power is coming from shore power or the generator.

When Do We Remove It?

We may remove the automatic transfer switch if the RV was prepped for a generator but does not actually have one.

It may also be removed when installing a Victron Quattro inverter. The Quattro has two AC inputs and its own internal transfer function, allowing shore power and generator power to connect separately.

This setup can be especially helpful when the generator provides less power than the shore connection. Each input can have its own AC current limit, helping protect the generator from being overloaded.

The right setup depends on your RV, inverter, generator and overall power goals. Visit BigBeardBattery.com, fill out the solar design form and let our team help design an RV solar and lithium battery system that fits the way you travel.