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Generator Buying Guide

Things to Know Before You Buy

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Buying a generator can be a daunting process. However, you can take control by being informed and getting organized. Here is a simple checklist to use to help in choosing the correct generator to protect your home and family.

• Determine wattage needs. Determine how much power you need for the items you care about. For help, try our power selection worksheet. If you decide to purchase a portable generator, don't forget you will also need a transfer switch to safely power the circuits in your home.

• Understand electrical terms. You’ll see a lot about watts, volts, amps and more. Review the glossary for definitions.

• Decide: Standby or portable? Considering your budget, convenience, and power needs, choose which type of generator you want.

• Take care of home power issues. Locate your existing electrical service panel and gas line to target any potential problems before buying a generator. Portable generators should be used with a transfer switch.

• Perform product comparisons. Compare power outputs, run times, and prices, as well as what’s included in those prices, such as accessories, warranties, support and installation.

• Determine financing options. Some retail stores offer financing options for generator purchases. Amazon offers FREE Super Saver Shipping and provides no interest financing on select items.

• Consider included items. Does the generator come with warranty or maintenance package? What about a power cord, oil, wheels, and funnel?

• Consider additional costs. How much more will it cost for installation by a qualified professional? Will you need an accessory like a cover for protection from the elements or a transfer switch?

• Establish your budget. Generator prices fall across a wide range, so determining how much you’d like to spend is important.


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What Types of Generators Are There?

Generators come in two basic types: standby and portable. There also are inverters, which are not generators but may meet your needs. The source of backup power you ultimately choose will be determined by many factors, including your power requirements.

Standby generator
Standby Generators: A standby generator is permanently installed outside your home or commercial building and wired directly into the electrical system to provide power to some or all of your home's circuits during a disruption of normal utility power. Depending on the model, they may start automatically when the power goes out and stop when the power returns. Standby generators are fueled by liquid propane or natural gas and require professional installation, often with a permit.

The number of circuits to which a standby generator can provide power--and the number of appliances you can run on those circuits--is determined by the power capacity of the generator.

Standby generators are typically fully enclosed and vary in size. Check the dimensions carefully. A standby model may cost as little as $1,500 or as much as $15,000 or more--the greater the power capacity, the higher the cost.

Portable generator
Portable Generators: Portable generators are versatile. You can use them for emergency power at home, for power in remote locations where utility power is unavailable, or for recreational purposes, like boating or camping.

Portable generators are fueled by gasoline and include 120-volt power outlets like the ones in the walls of your home. When the generator is running, you can plug appliances and tools directly into these outlets. Some generators also include 120/240 or 240-volt outlets. These are especially useful for running powering into a transfer switch.

Portable generators range in cost between a few hundred dollars to several thousand dollars depending on the capacity and features.

Inverters
Inverters: Inverters turn DC power into AC power, the type of current that powers everyday appliances. A common use of an inverter is to connect one into a car's cigarette lighter and then plug small home appliances into the inverter.

Inverters have added features over the years, and today many inverters include emergency radios, lights, or their own internal battery to store power.

When you purchase an inverter, you need one that can handle the wattage of the appliances you intend to connect to it. Some inverters are made specifically to power low-wattage appliances, like portable phones or digital music players. Others can handle heavy-duty power tools.

If you're buying an inverter that's powered by its own battery, you'll have to consider how many hours the inverter can provide power before needing a recharge.

Inverter-Generator
Inverter-Generators: These gasoline powered generators are typically smaller and run quieter than the open frame generators and they often vary the engine speed to the required load, saving gas and wear and tear on the generator. These generators are great for camping where noise may be a concern and for powering sensitive electronic equipment.


Portable propane generators
Propane-Powered Generators: Similar to portable and standby generators, these cleaner burning generators run on propane - making them ideal solutions in emergency situations where gasoline is scarce. Additional propane tanks can be saved and used as backup tanks, keeping the power on.

The rest of this buying guide focuses solely on standby and portable generators.


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How Much Power Do I Need?

There are two basic power measurements for generators: starting watts (also known as startup power, max watts, or peak power) and continuous or running watts. Starting wattage is required for appliances at startup or when they are running at their highest levels of power consumption. Continuous power is the wattage required for operation of those appliances under normal load. Both are measured in wattage.

We've provided a worksheet to help you determine your specific needs based on the peak and continuous wattage requirements of the appliances you want to power. What's below is a general guide.

Standby Generators

Standby generators create from 5,000 to 25,000 watts or more of power. You'll have to choose a generator that supplies sufficient peak and continuous wattage for the appliances on the circuits you need to power.

You can choose between an air-cooled and a liquid-cooled model standby generator. Generally, liquid-cooled models are bigger and create more power.

Portable Generators:

A small 1,000-watt portable generator may be all you need for recreational purposes. And you may use up to 8,000 watts if using a generator to power tools on the jobsite.

Because you plug appliances directly into a portable generator, you'll also want to make sure that your model has the number and type of outlets you need. The size of the fuel tank also is crucial. The bigger the tank, the longer your generator can run without refilling and produce power.

If you want to use a portable generator to power specific circuits in your house, a transfer switch is required. For running an entire house, follow the guidelines for choosing a standby generator.


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What Features and Accessories Do I Need?

Aside from pure power production, there are some useful features and accessories to consider when buying a generator.

Transfer switch - If you want to use your generator to power part or all of your home, you'll need a sufficiently sized generator and a transfer switch. The transfer switch safely closes off the utility power line to your house's electrical system and opens a direct line to the generator and reverses the process when utility power is restored.

Standby models can work either with a manual or an automatic transfer switch. The benefit of an automatic transfer switch is that it senses when utility power has been lost and automatically switches to generator power.

Wheeled Frames - As the name suggests, portable generators can be transported to different locations. The smallest portable generators are comparatively light--perhaps 50 pounds--and can be carried. Larger models can weigh as much as several hundred pounds, making a wheeled frame essential for moving it out of the garage or shed to power up when you lose power.

Noise - Generators aren't necessarily quiet. Some offer extra features to reduce the noise created during operation. Look for large mufflers if noise is a concern.


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How Do I Install and Operate a Generator?

Standby generator installationStandby generator: Standby generators are wired directly into your current electrical system and generally require professional installation. Installing a standby generator by yourself may void the unit's warranty or violate local building codes, so research these issues before you begin. The basic steps are as follows.

First, mount the unit outside your home on a concrete pad or plastic mounting pads that come with the generator. You may need a contractor to pour the concrete foundation and mount the generator.

Next you'll need to contact your gas or propane company to connect the unit to its fuel source.

Last, you'll have to call an electrician to hook the generator up to your home's electrical system. Some generators come with pre-wired kits that make it easier for the "do-it-yourselfer" to do the wiring. In most cases, it's probably safest and best to have this work done for you by a licensed professional.

Once installed, operation depends on whether you've used a manual or an automatic transfer switch. With an automatic transfer switch, if the generator senses a disruption in utility power, it turns itself on and takes over power production until utility power resumes. With a manual transfer switch, you have to handle these chores yourself.

On a standby model, you'll have to change the oil and filters on a regular basis. Many manufacturers provide maintenance kits to make this easier.

Standby generator installationPortable Generator: Setup for portable generators is easy. Just make sure to keep the exhaust port pointed away from your house, and to have the proper distance from your windows and other house openings. If you're not planning to hook your portable generator into your home or building's electrical system, there is not a lot of setup involved other than finding a safe place outside your home for the generator. Because portable generators create carbon monoxide, you should never run them inside a building, beneath a window, or near any opening to your house (doors, vents, etc.).

Once situated, fill the generator with the required type of gasoline and oil and start the unit. Startup can be as simple as pressing a switch, but on some you'll have to yank a manual recoil pull-cord.

Of course, you will have to plug the appliances you want to power into the generator, refuel it as necessary, and shut the generator off when you're finished with it.

If you want to connect your generator to your home's electrical system, you'll need a manual transfer switch. Make sure your generator's manufacturer supports connecting your model to a transfer switch. If supported, comply with your model's safety and warranty guidelines as well any local building codes during the installation. In general, it's best to hire an electrician to handle the wiring of your home to the generator and transfer switch.

However you use your generator, over time you'll have to change filters, oil, and spark plugs. Plus, you should not store gasoline in the generator when you're not using it. Either run the generator empty or add a gasoline stabilizer that will prevent the gasoline from "gumming" up. Many manufacturers sell tune-up kits for their models.Follow the instruction manual closely.


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Safety Tips and Sever Weather Preparation

Generator Safety: Always read the owner’s manual and instructions for your generator and carefully follow all instructions and warnings in order to safely start and operate the generator. These tips are merely supplemental and are not intended to substitute reading of the owner’s manual.

• Never run a generator indoors or in partly enclosed areas such as garages. Only use outdoors and away from windows, doors, vents, crawl spaces and in an area where adequate ventilation is available. Using a fan or opening doors and windows will not provide sufficient ventilation.

Operate the generator only on level surfaces and where it will not be exposed to excessive moisture, dirt, dust or corrosive vapors

Do not overfill the fuel tank. Always allow room for fuel expansion.

Never add fuel while unit is running or hot. Allow generator and engine to cool entirely before adding fuel.

Never store a generator with fuel in the tank where gasoline vapors might reach an open flame, spark or pilot light.

Do not connect your generator directly to your home's wiring or into a regular household outlet. Connecting a portable electric generator directly to your household wiring can be deadly to you and others. A generator that is directly connected to your home's wiring can 'back feed' onto the power lines connected to your home and injure neighbors or utility workers.

The generator must be properly grounded. If the generator is not grounded, you run the risk of electrocution. We strongly recommend that you check and adhere to all applicable federal, state and local regulations relating to grounding.

Allow at least five feet of clearance on all sides of the generator when operating.

Inspect the generator regularly and contact the nearest authorized dealer for parts needing repair or replacement.

Do not overload the generator. Do not operate more appliances and equipment than the output rating of the generator. A portable electric generator should be used only when necessary, and only to power essential equipment.



Severe Weather Preparedness: Be prepared for severe weather or other events with this emergency checklist of emergency necessities. Store loose items in sturdy, easy-to-carry containers, and keep them together in an easily accessible place. This list is for introductory purposes only; you should customize your own Family Disaster Plan.

3-day supply of bottled water (1 gallon per person per day) and canned goods

First Aid kit with prescription medications

Flashlight

Extra generator fuel and extension cords

Non-electrical can opener

Batteries

Weather radio/portable radio

Blankets

Emergency telephone numbers

Having a generator for your emergency backup power is an additional way to be prepared for any event that threatens utility power. An emergency backup generator will keep the lights on and the freezer cold, providing your family that feeling of safety and security.


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Need to Know How Much Wattage?

Power requirement worksheet
Download our worksheet (PDF) to help determine your power requirements.