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What Size Generator for a 200 Amp Service?

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Your interest in this article is much appreciated, and I believe in the need of having ready access to a generator in the event of a blackout. 

So that you can make a well-informed decision, I am here to help you sort through the maze that is generator selection. 

How big of a generator would I need to power my home, which is now wired for 200 amps? is something that many homeowners wonder, so that's what we'll be talking about today.

The vast majority of consumers likely already know that generators come in a variety of shapes and sizes, each with its own set of features.

It can be difficult to decide which generator is best for your home. Don't worry though; I am here to lend a hand. This post is designed to help you choose a generator for your 200 amp service by outlining the considerations you should keep in mind.

When all is said and done, I want you to rest easy knowing that your home is prepared for a power outage with a generator that can keep up with your needs. No matter if you've bought a generator before or this is your first time, we're here to help you find the right one for your house and family.

What Size Generator for a 200 Amp Service?

Champion Power Equipment 100837 14kW Home Standby Generator System, 200-Amp aXis Automatic Transfer Switch

If all you need is a rough notion of what sizes you'll likely be working with in the future, the simpler approach is ideal.

The "advanced" option is the best bet for those who want a more effective, optimal, and maybe safer configuration.

Although I suggested you not put too much stock in the service's 200-amp capacity, it is important to note that this is the absolute most that may be employed under the given conditions.

Size-wise, this means you can't get much bigger than 48,000 watts with 100 amps. At 24,000 watts, a 200 amp service uses only half of the power available from a standard 100-amp circuit.

Furthermore, some electricians may recommend that you use no more than 80% of the service's total capacity, which is something that I do not seem to be bothersome.

If your circuit is rated at 200 amps, the maximum amount of power that can be used is 38,400 watts. However, this would push the service too hard and would be risky long term. 

In reality a 15 kW generator is the absolute minimum and a 20 kW generator is the absolute maximum that can be used in this situation.

With a 200-amp service, a generator of this capacity is regarded to be medium-sized.

Since things like central air conditioners often consume the most electricity of all household appliances, these numbers are generally approved by electricians.

The problem with this approach is that it could lead you to oversize or undersize your generator.

When running electrical equipment, a generator that is too tiny can trip the breaker repeatedly and could cause damage. However, a generator that is too large might lead to higher costs, decreased efficiency, and wet stack. These conditions we've been talking about can reduce the generator's useful life.

What to consider when buying a 200 amp generator

Generac 7043 Home Standby Generator 22kW/19.5kW Air Cooled with Whole House 200 Amp Transfer Switch, Aluminum

When planning for a power outage, it can be difficult to decide which portable generator to buy, especially if you want to run all of your home's appliances. 

Some generators have a load control mechanism that cuts off electricity to certain devices when the system is at capacity. 

Getting a generator the size of a small castle is not necessary. It is possible to have a separate sub-panel for only the necessary loads in the event of a power outage. Here are some tried-and-true guidelines for picking a home generator.

Fuel supply

Most power outages occur for no apparent reason. Unless the blackout is continuous, you have no way of knowing when the electricity will be restored. When the temperature outside is low or when the next gas station is far away, having a large fuel tank allows you to keep the generator running for extended periods of time.

If you really need electric heat, which will reduce your fuel economy, a huge fuel tank is your next best bet.

Having a large fuel tank is helpful for any generator, single-phase or three-phase, but especially for the former. Both liquid propane and natural gas can fuel the generator. Be sure you have enough of either to run everything that needs to be run on your home's electrical system, from the pool heater to the hair dryer.

Provision for a circuit breaker slot

Either a permanent installation or a portable generator, a circuit breaker slot is necessary for overload protection. 

The logic behind the load-management plan is the same. However, if a single-pole breaker is installed in the single breaker slot, it will function efficiently and swiftly.

However, you can't take any chances with a direct connection and rely only on the load management system. Another way to safeguard the generator is to have a dedicated circuit panel for use only when necessary. If your service panel can handle 200 amps or less, you can safely run the generator at full capacity.

Total harmonic distortion

If you have sensitive electronic equipment, you should use a generator that meets the THD standard. The THD will power up slowly to protect the sensitive components from being damaged. 

The sine wave variations between DC and AC power sources might cause damage. Think about how many people and what equipment you intend to serve while selecting generators to buy. 

Just be aware a generator can only power so many devices at once.


You'd want to have a generator that can be moved around easily and quickly. Starting with collapsible wheels and handles is a good idea.

Because you can't possibly carry it on your back, the generator needs wheels if you're going to be moving it solo. The generator should have more than two outputs so that users have greater flexibility and options.

Noise pollution

A low-tone muffler will keep the noise level manageable when the generator is in operation. 

A silent generator can ensure that your home continues to operate regularly even if the electricity goes out. The most silent generators are in highest demand in the current market.

Go modern

Compared to a single-phase generator, investing in a three-phase generator will yield better results due to its versatility. 

When there is a power outage, you can't function without your lights and other appliances. Bring a portable one with you if you can. 

Modern generators are of a really high standard nowadays.

Best 200 amp service generators

Let's look at some of the best generators for a 200 amp service. 

Champion Power Equipment 15,000/12,000-Watt Portable Generator 

Champion Power Equipment 100111 15,000/12,000-Watt Portable Generator with Electric Start and Lift Hook

If you'd like to have access to home electricity wherever you go, the Champion Power Equipment 100111 15,000/12,000-Watt Portable Generator is a fantastic investment.

This portable generator packs a powerful punch, making it ideal for use at home or on the road. 

It's easily transportable and lightweight.

This generator runs on nothing more than water and air, so it can meet all of your needs with ease.

Champion Power Equipment's portable generator features a gas-powered engine that runs quietly and reliably for long periods of time.

This generator is quite light at 330 pounds, making it easy to transport.

Whether you're at home or on the go, you'll be able to meet your power needs with this product thanks to the smart gauge that displays voltage, hertz, and run-time hours.

The Champion Power Generator has four 120V 20A GFCI outlets spread throughout. Each outlet is protected by its own individual safety system.

For those with stricter needs, this unit has a lockable 220v 30 amp plug in addition to two regular outlets.

The gasoline tank reservoir on this portable generator is conveniently located behind a door on one side of the unit. This makes refueling a simple and quick operation.

Anytime you need electricity, whether at home or on the road, the Champion Power Equipment 100111 Generator is a great investment.

The generator has a nine-hour operating time, even on an empty tank, so it would be more than sufficient in the event of an emergency.

This generator is backed by a three-year limited warranty, so you know you'll receive your money's worth and can confidently recommend it to customers with heavy electricity demands.

Generac GP15000E 

Generac GP Series GP15000E Model 5734-0 Portable Generator (49 State)

When it comes to fulfilling the demanding power needs of today's households, the Generac GP15000E Gas Powered Portable Generator is an unstoppable force.

This generator has a maximum running power of 15000 watts and a maximum starting power of 22500 watts. Perfect for stocking an emergency supply kit at home.

A 16-gallon gasoline tank, an idle control that lowers noise and fuel consumption, and a sturdy steel frame are just some of the features of this generator. You can use it for up to 10 hours if you keep the load below 50%.

The generator can power everything in your home thanks to its 120 volts and two 3000 watt outlets (one L14-30R twist-lock and one L14-30P socket).

For your convenience, the generator was built with a low oil cutoff and an hour meter.

Two twist-locking 12V L14-30R outlets and four heavy-duty rubber feet provide maximum stability on the job site or in other demanding environments.

You can buy with confidence knowing that the Generac GP15000E Gas Powered Portable Generator includes a two-year guarantee on parts and labor and an additional year of protection against power outages.

The 992cc OHVI engine has more than enough power for any task, even in the most difficult conditions.

This generator has an electric start mechanism, so you won't have to waste time twisting a hand crank to get it running again if you accidentally switch it off. As an alternative, you need not waste any time getting back to business as usual.

Generac 7077 Guardian Series, 20kW/17kW

Generac 7077 Guardian Series 20kW/17kW Air Cooled Standby Generator with Aluminum Enclosure - 3 phase

If a typical home were to use one of the 20kW or 17kW units in this series, power would be maintained at up to 200 amps during a power outage or blackout.

The Guardian Series has a variety of features that make life easier and more comfortable in the event of a power outage, and they also help to extend the useful life of sensitive devices. Your time spent without electricity will be less stressful and more convenient thanks to this.

Generac offers a 20kW/17kW air-cooled standby generator in their 7077 Guardian series, and it can run on 200 amps of current.

While an automatic transfer switch is not included with the generator, it is possible to purchase one separately. The case's all-aluminum construction makes it resistant to the elements, and its detachable panels make it simple to get in and out.

To ensure that your sensitive electronics and household appliances run as smoothly as possible, this generator has Generac's "TruePower Technology," which is the best in its class.

Generac's evolution controller streamlines operation of the generator's many features.

Features such as generator health, utility power availability, and service needs are all indicated via LED lights.

The two types of generators in this set are suitable for most homes that need 200 amp service and can serve as a backup power source in the event of an emergency while camping, boating, hunting, or using other recreational vehicles.

The generator has a number of features that, in addition to extending the life of delicate electronics, will make your time without power as convenient and comfortable as possible.


Finding the optimal generator for a 200 amp service requires careful consideration of a number of aspects, including power output, fuel type, and run time, but is ultimately worthwhile so that you can keep using your home's energy even in the event of a power outage. 

Never forget to factor in the generator's type, benefits, and drawbacks when planning. The installation of your generator is only as good as its capability, so have it checked thoroughly by a professional to be safe. 

I hope you'll have picked up some tips and tricks that will aid you in your quest to find the best home generator. To ensure your generator lasts as long as possible, regular maintenance is a must. Kindly use caution in the event of a power outage; we appreciate your reading this.

About Tom Bell

Hey, I’m Tom, the owner of Generator Reviews! I built this website to help you get the very most out of your generator and select the correct one for your personal circumstances. This site contains reviews of virtually every generator, detailed buying guides, as well as maintenance advice to help you keep yours in tip-top shape!


Generator.Reviews is an independent review business. I am not affiliated with any manufacturers and do not accept paid reviews. When you buy through my links, I may earn a commission which helps me to maintain this website and keep the reviews coming your way!

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