10,000 Watt Generator ~ Things To Consider | How To Size

Generator Sizes

With an emergency generator, you can keep the essential equipment working in your house.

Although low-watt generators can power lamps and small fans, higher-watts can run the refrigerator and central air-conditioner.

That way, when electricity eventually comes back, your household won’t miss a beat.

Will a 10,000 Watt generator run central air? Yes, a 10,000-watt generator can run your centralized air-conditioner. Any generator below 10,000 watts can only run smaller appliances and tools in your home, such as lights and fans.

If you do not have the right-sized generator for your home, you are risking both your and your house’s safety.

Here is a complete guide to help you determine the right size for your home A/C.

Things To Consider In A New Backup Generator

Aside from lowering the insurance premium, backup generators will fuel your home for a few days.

It will allow your house to stay efficient and relaxed, even amid a blackout. It is essential for households of young and older people.

Also, if you run your company out of your house, you’re probably going to want uninterrupted electricity.

Don’t fear missing jobs worth a day or a week due to an electricity outage! It makes sense to have a generator, especially in areas where there is a daily power interruption.

How To Size Your Generator

1. List The Starting And Running Wattage

The starting and running wattage of appliances and systems are usually visible on the label of the unit.

If not, you can see that in the owner’s manual. Many of the owner’s guides are available online now, so you can look them up if you can’t find them.

You can also measure the energy usage of your appliance with this US energy calculator.

2. Calculate The Wattage

If the power specifications are laid out in amps, you can quickly convert them to watts using this formula: Watt = Amp x Volt. Note that 1 kilowatt = 1,000 watts.

When calculating the generator capacity, you can always convert Amps to kW.

Combine all the necessary watts that you will be powered simultaneously. This sum would be the general size of the generator you use.

Shortcut Generator Sizing Guide

The easiest way to assess your generator is to determine your HVAC machine’s electrical demand by far the most significant electricity source in your house.

Find your air conditioning unit and search for loads, BTUs, or Amps. If you can’t spot the machine’s sticker, look for the A/C breaker on your circuit board.

  1. If you have a 3-ton or 30-Amp, 36,000 BTUs HVAC, you need at least a 14 KW generator.
  2. If you have a 4-ton or 40-Amp, 48,000 BTUs HVAC, you need at least a 17 KW generator.
  3. If you have a 5-ton or 50-Amp, 60,000 BTUs HVAC, you need at least a 20 KW generator.

The Best Generator For Central Air Available

A 10,000-watt generator is a perfect option to fuel most of your household appliances during a power outage.

But not every 10,000-watt generator is the same. Since the generators that big don’t come cheap, you can only invest in a top-quality model.

Westinghouse WGen9500DF Dual Fuel Generator

WGen9500DF is among the strongest generators Westinghouse has ever offered, and it received overwhelmingly positive feedback from its users throughout the years.

This excellent dual fuel generator will power a host of standard household appliances, including the refrigerator, freezer, and lights.

The generator generates 9,500 working watts and 12,000 starting watts while gas is used.

Liquid propane gas gives you an output of 8500 watts and 11200 watts. The intuitive control panel monitors the machine with two ground fault circuit interpreters.

The two are known as house 5-20R 120 Household Duplex and L14-40 120/240V twist-lock outlet control.

This generator has a huge 6.6-gallon fuel tank. Also, it comes with a propane hose that you can use to attach to a propane tank.

Fuel performance is a significant selling point for this engine. You should be able to power it on gas and liquid propane for up to 17.5 hours.

Users love this generator’s remote start function, and it helps you start a generator with a key fob even though you’re far from it.

The portable generator begins with the press of a single button without any problems.

The battery device configuration is self-charged to prolong the battery’s life and the operation of the generator.

DuroMax XP5500EH Electric Start

The DuroMax XP12000EH, Or “The Beast,” is a mighty 10,000-watt generator, and it’s got the original Duromax 457 cc OHV engine.

The motor gives you a choice of gas and propane, allowing you better working time and more freedom.

Lower cost of service is another central selling point. But no matter what type of gasoline you plan to use, the engine will get a lot of power out of it.

It will take up to 12,000 watts to start and 9,500 watts to work.

The amount of energy given by this generator is enough to run several machines smoothly simultaneously.

It includes refrigerators, A/Cs, and loads of other items on top of that.

Its engine can supply power through several ports equal to 120 volts or 240 volts.

The control panel is fitted with a 50 AMP outlet for a large RV or attaching it to a home transfer switch, and the generator has a 30 AMP socket and a 120V/240V twist-lock outlet.

There are also a second 120V 30 AMP outlet and two 120VAC 20 AMP outlets.

CARB and EPA accredit the dual-fuel generator for safety and environmental standards in all 50 states.

The machine will run on one propane tank or 8.3 gallons of fuel blended for more than 15 hours.

It also has built-in noise-reduction features, making it relatively quiet for a portable generator of this scale.

All Power America APGG10000GL

The 8-gallon fuel tank can run for 11 hours at 50 percent of its total capacity of 10,000 watts.

It only makes 76 dB of noise when 8,000 watts of power is drawn.

This generator emerges with an hour meter so that you can see how long your generator has been working.

You can power your home with the NEMA L14-30 socket that delivers up to 30 amps of power.

Installing A Generator To Power Your HVAC System

If you have a generator in your home, you can connect it to your HVAC and get the heat you need.

If you do this, you ought to get it mounted and planned well before the power outage.

Working On The Transfer Switch

The furnace is directly connected to the circuit of most households. You cannot connect the generator until a transfer switch is mounted between your furnace and the circuit breaker.

A licensed electrician should carry out this installation. If you already have a shift switch installed, you can contact the electrical worker before finishing the operation.

Preparing The Space

  1. You have to turn off the circuit breaker to your furnace before you do something else.
  2. Be sure the power is off, or expect to electrocute yourself.
  3. Collect all the materials you’re going to need.
  4.  From the wire cutters to the extension cord and the generator itself, you should have the materials ready to finish the rest of the job.

Rewiring The System

  1. You’re going to have to cut the wire that runs from the furnace to the circuit breaker.
  2. Then install the outlet on the breaker panel. Make sure that the wires run from the circuit breaker to the furnace with the extra outlet so that you can plug the generator when you need it.

Installing The Plug

  1. You need to install the plug on the side of the furnace.
  2. Then screw in the furnace and reset the breaker. Make sure the heater is still running well, and make sure that the engine is working in the boiler, too.

What To Know When Plugging In The Generator

You should keep it away from children and drinks. Run an outdoor extension cord from your boiler to the generator when the electricity comes on—making sure you don’t overwhelm it.

Otherwise, you’re not going to end up being able to heat your house.

Why It Is Important To Choose The Right Generator Size

  • Increase the usable life of the generator
  • Decreased chance of overheating and electrical fire
  • Reduction of frequency and operating costs
  • Reduced risk of injury to properties
  • Increased protection of staff
  • Increased convenience and repair pace
  • The output of stable production
  • The limited occurrence of power overload
  • The limited occurrence of sudden device malfunction


It is indeed tempting to skimp on the size of your generator because doing so will save you a few bucks.

But using a generator that has watts too small for your generator will only result in a failed formula.

Not only can it damage equipment and machines connected to it, but it can also pose a threat to your home.

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