How To Choose a Manual Transfer Switch for Your Generator


A manual transfer switch is crucial for homeowners looking to power their homes safely during power outages. Serving as a bridge between a generator and your home’s electrical system, the right switch ensures smooth power transition, allowing for a seamless shift between utility and backup power. 

In this blog, we’ll outline how manual transfer switches work, their many benefits, and the crucial factors to consider when choosing the best option for your generator.

How Does a Manual Transfer Switch Work?

A manual transfer switch allows you to safely connect a generator to your home’s electrical system. In the event of a power outage, the device enables you to easily shift from the main power source to the generator.

Once activated, it isolates the circuits you’ve pre-selected to back up, ensuring that the generator doesn’t overload and the house wiring is protected. 

This process prevents dangerous backfeed to the grid, and when utility power returns, you can manually return back to the main power, disconnecting the generator. The switch ensures a seamless, safe transition between power sources.

What Are the Benefits of Installing a Manual Transfer Switch?

Let’s cover a few of the benefits that come with installing a manual transfer switch:

Improved Safety

The primary benefit of installing a manual transfer switch is the enhanced safety it provides. Manual transfer switches prevent backfeed, ensuring that electricity from your generator doesn’t flow back into the main power grid. Doing so is crucial as backfeed can endanger utility workers repairing power lines and potentially damage your generator.

Ability to Power Hardwired Appliances

Not every device or appliance in your home can be easily plugged into a portable generator. With a manual transfer switch, you can directly power hardwired systems such as your home’s heating or cooling system, ensuring uninterrupted comfort during power outages.

Streamlined Power Management

A manual transfer switch provides homeowners with the convenience of selecting which circuits or appliances to power during an outage. This ability lets you prioritize essential devices, ensuring optimal power distribution while keeping the generator load in check.

What to Consider When Choosing a Manual Transfer Switch

Here are some things to keep in mind when you’re looking for the right manual transfer switch for your needs. It’s essential to make sure that your transfer switch is compatible with what you’re aiming to accomplish.


The amperage you’ll require depends on your generator’s specifications and the specifics of your property. Large properties with significant electricity consumption are likely to require a large generator and a manual transfer switch with higher amperage. EcoFlow Home Backup Transfer Switch provides a rating of either 60A at 125 VAC or 30A at 250 VAC. 


The number of circuits a transfer switch supports is crucial. With EcoFlow Transfer Switch, homeowners can designate up to six essential areas of the house to have on separate circuits — for example, the kitchen, garage door, and main living areas. Ensure the transfer switch supports the number of separate circuits (and the wattage/amperage of the appliances) you aim to back up.


Start by determining the starting and running wattage of all the appliances you want to operate simultaneously with your generator. Make sure that the generator you purchase supplies sufficient wattage to meet your electricity consumption needs.

You can learn more about how to calculate your household consumption here.

Your transfer switch needs to be capable of handling at least the total wattage consumed by the appliances you want to operate. Don’t forget to factor in starting watts (surge power).


When assessing manual transfer switches, it’s essential to prioritize specific features that promote safety, convenience, and efficiency. Selecting a model with the right features ensures you get the best performance, compatibility, and longevity.

There might be additional factors that are important for your situation, but here are some features to look for:

  • Pre-wired for Easy Installation: A pre-wired switch, much like EcoFlow model, simplifies the installation process. This feature reduces the chance of wiring errors, ensuring that power transitions are seamless and safe.
  • Wattmeters: Integrated wattmeters let you monitor power consumption in real-time, which helps in managing your power load efficiently, ensuring you don’t overload your generator.
  • Compatibility: Ensure the transfer switch is versatile and can work with multiple generator types. The EcoFlow model, for instance, integrates well with several EcoFlow products like EcoFlow DELTA Pro and EcoFlow DELTA Max

As you can see, there is a lot to consider when choosing the right transfer switch. In addition to the above, you’ll also want to confirm that your transfer switch is suitable for your circuit breaker panel. For example, EcoFlow’s transfer switch is viable only with indoor circuit breaker panels.

When deciding on a transfer switch, it’s not just about choosing a device; it’s about securing peace of mind. With power outages becoming more frequent, investing in a quality transfer switch like the one from EcoFlow can make all the difference during blackouts.

Remember, your transfer switch must be installed by a licensed professional electrician and in accordance with the instructions from the manufacturer and the National Electrical Code, as well as all local electrical codes.

Frequently Asked Questions

What Size Manual Transfer Switch Do I Need?

The size of the transfer switch you need depends on a number of factors and your specific circumstances. Choosing the right transfer switch for your needs involves considering what you require in terms of factors such as amps, circuitry, wattage, and features. 

Final Thoughts

Choosing the right manual transfer switch for your generator is paramount in ensuring safe and efficient power backup during outages. As we’ve outlined, understanding how these work, recognizing their benefits, and considering crucial factors like amps, wattage, and key features will guide your decision. 

So much peace of mind comes from having a whole home generator and a reliable transfer switch like those we offer at EcoFlow. Take the first step to energy independence, and browse our selection today.

EcoFlow is a portable power and renewable energy solutions company. Since its founding in 2017, EcoFlow has provided peace-of-mind power to customers in over 85 markets through its DELTA and RIVER product lines of portable power stations and eco-friendly accessories.

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