Tips on How to Connect Generator to House without Transfer Switch


Do you often experience a sudden loss of electricity in your home? Do you want to know how to connect the generator to the house without a transfer switch? If you often experience sudden power loss in your home, you probably want to use generators for backup power. And it’s easy to use an extension cord to connect the generator to the house without a transfer key, but it would be a bit messy.

Can I connect a generator to an outlet?

A generator isn’t supposed to be plugged into an outlet. Although physically possible, there are significant risks involved. Not only is this illegal in some areas, but it can also cause permanent damage to your home’s electrical system through backfiring.

Can I connect directly to the generator?

You can securely operate devices that are directly connected to the generator. You can power your refrigerator, power tools, and computer (for example) by connecting long extension cords to the generator. Start the generator and connect the cables. Then go inside and connect the loads to the extension cord.

Can an electrical box connect to portable generator in the event of a power outage?

When there is a power outage, there is no question that the best way to provide emergency power to a home is with a standby generator system. In cases where a standby generator is not practical or cannot be installed for some reason, a portable generator can provide power during a power outage.

How much is it to set up a transfer switch for a portable generator?

With one switch, you can turn all this on and skip the extension cords. Allow $500-$1,500 for the switch, including installation, which typically takes less than a day.

Which generator size is sufficient to power a house?

With a 5,000 to 7,500-watt generator, you can power even the most critical appliances, including refrigerators, freezers, well pumps, and lighting circuits. All of these devices can be operated at the same time with a 7,500-watt generator.

Can a portable generator use an automatic transfer switch?

Any type of generator can use both manual and automatic transfer switches. If you have a towable, PTO, or portable generator, you usually prefer a manual switch. Standby models, such as our PSS or diesel generator sets, utilize an automatic transfer switch.

Step by step guide on how to use a generator transfer switch without any Generator

  • Create a place in your preferred location for departure

To do this, using your wood and drywall oscillating tool, cut a rectangular hole in the wall to fit your outlet. You can also utilize your drill for a concrete cement wall.

  • Drill a hole to plug in your generator wires

Using your drill, drill a hole to run the wires from the outside of your home. Make sure your cables are larger than the expected diameter. In this way, you can avoid damage to the electrical wiring when installing it in your outlet kit.

  • Install the weatherproof box on the exterior of your wall

On the exterior wall, install your waterproof box. This box is to protect your end cap from potential damage. You can use any lock box, like this Sigma Electrical Box, to lock the end plug. However, you may need to find a larger lock box to put your cables in.

  • Plug the cord toward the wall outlet

To connect the cables to your wall outlet kit, plug the other end of the cables into an outlet outside your home. After installing the line, you can now mount the outlet kit inside.

When you have installed the outlet and cable, you can seal the outer and inner hole with a sealant. You need it to waterproof your pipes.

  • Plug the generator into the outlet and test

To test this plug-in type connection, turn on the generator power, plug in the input plug, and connect the extension cord to the generator’s input plug. Plug in your power consumption tester and plug in a few devices that have a compatible wattage rating with your generator to read how many watts your generator produces.

How Many Appliances and Devices Can I Use with a 3000 Watt Generator?

The answer depends on how many watts your devices have or how many devices you have in your home. You can use several lights with a lower voltage at the same time, and even some electrical devices, such as a phone charger and a laptop.

This means you can operate multiple fixtures and lights as long as they don’t exceed the maximum capacity of the generator.

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However, if you need to operate power-hungry appliances, such as a portable electric kettle, you may need to operate it separately. This is to prevent overloads that could damage your generator’s circuitry. It is also good practice to make any necessary checks on your appliances power supply before using it on your backup power supply.

Note: Incorrect power calculation can cause overloads which can damage your generator circuit. So instead of aiming for a maximum wattage of 3,000 watts, you should only aim for 2,500 to 2,800 watts. This will prevent damage and extend your generator’s life.

A 15 Kilowatt Generator Will Power a House

Most average home appliances use a circuit wattage of 3,000 to 6,500 watts. So if you have a 15 kW generator, you can probably run all your appliances and lights with it. Also, it is generally compatible with 120 and 240 volt electrical outlets and allows you to operate both low and high wattage machines.

With a simple explanation, 1 kW is equal to 1000 watts of power. Therefore, a 15 kW generator set has a power of 15,000 watts. However, if you have more powerful devices that you use at the same time, even a 15 kW generator may not be enough. Before you run it all on your generator, you need to figure out the requirements for your home.

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In addition, it is essential to use manual transfer switches or generator lockout or automatic transfer switch on the 15 kW backup power supply. In this way, you can easily switch to the main electrical power supply when the power returns.

Because if your backup electricity is running at the same time as your main power supply, it can damage your generator.


For connecting a generator to a house without a transfer switch installed, this method is suitable, especially if you only need a small electric generator. You can use any lockbox for this application, especially if you want to use extension cords.

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So what do you think of this step-by-step guide on how to connect the generator to the house without a transfer switch? 

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