What Size Generator For 200 Amp Service

If you’re considering investing in a generator to power your 200 amp service, it’s important to choose the right size that can handle the electrical load. With numerous options available in the market, finding the perfect fit might seem overwhelming. Thankfully, this article will provide you with all the essential information to make an informed decision. From understanding the power requirements of a 200 amp service to calculating the generator size needed, we’ve got you covered. Get ready to find the generator that will keep your home running smoothly, even during power outages.

Determining the Size of Generator for 200 Amp Service

When it comes to choosing a generator for a 200 amp service, it’s important to consider several factors. The size of the generator needed will depend on the wattage required, the load factor, and the surge rating of the generator.

Calculating the Required Wattage

The first step in determining the size of the generator for a 200 amp service is to calculate the required wattage. This can be done by adding up the wattage of all the electrical appliances and devices that you plan to power during a power outage. Make sure to take into account both the running wattage and the starting wattage of each device.

Considering the Load Factor

Next, it’s important to consider the load factor. The load factor refers to the average power demand as a percentage of the total capacity. In other words, it’s the ratio of the average power used to the maximum power that can be used. For a residential setting, the typical load factor is around 70%.

Assessing the Generator’s Surge Rating

Lastly, it’s crucial to assess the surge rating of the generator. The surge rating refers to the generator’s ability to handle a temporary increase in power demand, typically caused by the starting of motor-driven appliances like refrigerators or air conditioners. It’s recommended to choose a generator with a surge rating that is at least 25% higher than the total starting wattage of all the appliances and devices.

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Factors to Consider When Choosing a Generator

Apart from the size, there are several other factors to consider when choosing a generator for a 200 amp service. These factors include the type of load, backup power duration, fuel type, noise level, and maintenance requirements.

Type of Load

The type of load you plan to power with the generator is an important consideration. Different types of loads require different amounts of power and have different starting requirements. For example, motor-driven appliances like refrigerators or air conditioners usually have a higher starting wattage compared to lights or electronics.

Backup Power Duration

Consider how long you expect to use the generator during a power outage. If you only need backup power for a few hours, a smaller generator with a shorter runtime may be sufficient. However, if you anticipate longer power outages, it’s better to invest in a generator with a longer runtime or one that can easily be refueled.

Fuel Type

Generators can run on different types of fuel, including gasoline, diesel, propane, or natural gas. Each fuel type has its pros and cons, such as availability, cost, and storage requirements. Consider which fuel type is most convenient and accessible for your needs.

Noise Level

Generators can be quite noisy when in operation, so it’s important to consider the noise level of the generator you choose. If you live in a quiet neighborhood or have close neighbors, a quieter generator might be a better option to ensure everyone’s comfort.

Maintenance Requirements

All generators require regular maintenance to ensure proper functioning. Consider the maintenance requirements of the generator you choose. Some generators may require more frequent maintenance or specialized servicing, which could affect the overall cost and convenience of owning the generator.

Choosing the Right Generator Size for 200 Amp Service

After considering the factors mentioned above, there are a few additional steps to take in order to choose the right generator size for a 200 amp service.

Consulting an Electrician

Before making a final decision, it’s highly recommended to consult with a licensed electrician. They can assess your specific electrical system and make expert recommendations based on your needs and the requirements of your home.

Sizing based on Load Calculation

An electrician can perform a load calculation to determine the exact size of the generator needed for a 200 amp service. This calculation takes into account the wattage requirements of all the appliances and devices, the load factor, and any surge demands. This ensures that the generator is appropriately sized to handle your electrical needs.

Considering Future Expansion

If you anticipate expanding your electrical system in the future, it’s important to take that into account when choosing the size of your generator. It’s generally recommended to select a generator that is slightly larger than your current needs to accommodate any potential future expansions.

Selecting a Generator with at least 20% Overload Capacity

To ensure the longevity and durability of your generator, it’s advisable to choose a generator with at least 20% overload capacity. This means that the generator can handle a temporary surge in power demand without getting overloaded and potentially getting damaged.

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Examples of Generator Sizes for 200 Amp Service

To give you an idea of the different generator sizes available for a 200 amp service, here are a few examples:

Generator Size for Essential Circuits

If you only want to power the essential circuits in your home during a power outage, a generator with a capacity of around 7,500 to 9,000 watts would typically be sufficient. This size can power important appliances like a refrigerator, lights, TV, and a few other essential devices.

Generator Size for Partial Backup

If you want to power more circuits or appliances during a power outage, a generator with a capacity of around 12,000 to 15,000 watts would be more suitable. This size can handle a larger load and power additional devices like air conditioners, sump pumps, and more.

Generator Size for Whole-House Power Backup

For those who want to power their entire home during a power outage, a generator with a capacity of around 20,000 to 25,000 watts would be needed. This size can handle the high power demand of a complete household, including all appliances, lights, heating, and cooling systems.

Different Generator Brands and Models for 200 Amp Service

There are several reputable generator brands and models available for 200 amp service. Here are a few examples:

Brand A – Model X

Brand A’s Model X is a reliable generator known for its durability and performance. It offers a range of sizes suitable for various needs and comes with advanced features such as automatic voltage regulation and low oil shutdown for added safety.

Brand B – Model Y

Brand B’s Model Y is a highly-rated generator that offers excellent fuel efficiency and quiet operation. It provides reliable power for both essential circuits and whole-house backup, ensuring that your electrical needs are met during a power outage.

Brand C – Model Z

Brand C’s Model Z is a popular choice among homeowners looking for a generator that combines power and convenience. With its user-friendly interface and advanced features like remote monitoring and electric start, this generator makes backup power effortless.

Installing and Connecting the Generator for 200 Amp Service

Once you have chosen the right generator for your 200 amp service, proper installation and connection are essential for safety and optimal performance.

Positioning the Generator

Place the generator in a well-ventilated area, away from any flammable materials. Ensure that it is positioned on a level surface and not in a flood-prone area. Follow the manufacturer’s guidelines for proper clearance around the generator.

Connecting to the Electrical Panel

To connect the generator to your electrical panel, a transfer switch is required. The transfer switch allows you to safely switch between generator power and utility power without backfeeding. It also helps protect your generator, appliances, and utility workers during an outage.

Meeting Local Codes and Regulations

It is important to comply with your local codes and regulations when installing and connecting a generator. These codes are in place to ensure the safety of your household and prevent any potential hazards. It’s recommended to hire a licensed electrician to handle the installation to ensure that all requirements are met.

Maintenance and Safety Tips for Generator Usage

To keep your generator running smoothly and ensure safe operation, regular maintenance and following safety precautions are important.

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Regular Maintenance Checklist

Check the generator’s oil levels regularly and change the oil according to the manufacturer’s recommendations. Clean or replace air filters as needed to maintain optimal performance. Inspect the spark plugs and replace them if necessary. Keep an eye on fuel levels and add fuel stabilizer to prevent fuel degradation.

Proper Fuel Storage

If you plan to store fuel for your generator, it is crucial to do so safely. Store fuel in approved containers in a well-ventilated area away from potential ignition sources. Use fresh fuel and rotate it regularly to prevent degradation. Follow local regulations for the maximum amount of fuel that can be stored.

Safety Precautions

When operating a generator, always follow safety precautions to prevent accidents or injuries. Keep the generator in a dry location and never operate it indoors or in enclosed spaces. Use heavy-duty extension cords and avoid overloading them. Do not connect the generator to your home’s electrical system without a transfer switch. Keep children and pets away from the generator when it is in operation.

Pros and Cons of using a Generator for 200 Amp Service

As with any decision, it’s important to consider the pros and cons of using a generator for a 200 amp service.


Using a generator for a 200 amp service provides backup power during a power outage, ensuring that essential appliances and devices can continue to function. Generators can be more cost-effective in the long run compared to other backup power options. They can also provide peace of mind by offering a reliable solution for unexpected power interruptions.


Generators require regular maintenance and refueling, which can be inconvenient for some users. Noise and emissions can also be a concern, especially for those living in close proximity to others. Additionally, the initial cost of purchasing a generator and the installation expenses can be significant.

Generator Accessories and Extras for 200 Amp Service

There are several accessories and extras available that can enhance the functionality and convenience of your generator for a 200 amp service.

Transfer Switches

Transfer switches allow for seamless switching between generator power and utility power. They eliminate the need for manual connection and disconnection of appliances and circuits during a power outage.

Remote Monitoring Systems

Remote monitoring systems enable you to keep an eye on your generator’s performance and status from anywhere. You can receive notifications about any issues or maintenance requirements via your smartphone or computer.

Cold Weather Kits

Cold weather kits are particularly useful if you live in an area with freezing temperatures. These kits include accessories like battery warmers and oil heaters to ensure reliable starting and operation in cold weather conditions.

Wheel Kits

If portability is a priority, consider investing in a wheel kit for your generator. This allows for easy transportation and maneuverability, making it more convenient to use and store the generator.


Choosing the right size generator for a 200 amp service involves calculating the required wattage, considering the load factor, and assessing the surge rating. It’s important to also take into account factors like the type of load, backup power duration, fuel type, noise level, and maintenance requirements. Consulting an electrician and considering future expansion can help in making the right decision. Examples of generator sizes for 200 amp service include those for essential circuits, partial backup, and whole-house power backup. Various reputable generator brands and models are available to suit different needs. Proper installation, maintenance, and following safety precautions are crucial for optimal generator performance and safe operation. While generators offer backup power during outages, they come with pros and cons that need to be considered. Accessories and extras like transfer switches, remote monitoring systems, cold weather kits, and wheel kits can enhance the functionality and convenience of a generator for a 200 amp service.

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Albert Stein

Starting this site about today's portable power options was an easy choice as it's one of my passions. Tech changes constantly so you need to make an informed decision before purchasing the wrong products. -Thank you.-

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