What will a 12000 Watt Generator Run?

In a protracted power loss, a 12000-watt generator is a massive backup power supply. Fortunately, the 12000-watt generator is available in a portable version for home and commercial use.

Whether you live in an off-grid farmhouse or a region prone to power outages, this is a complete package for your home.

A portable generator with a capacity of 12000 watts can power all or portion of your home’s appliances.

It can offer your entire home a constant source of electricity. For building operations, a 12000-watt generator is an excellent choice.

Even though a 12000-watt generator is large and heavy, it can be readily moved from one location to another. Because, like the 3000-watt portable generator, this generator comes with wheels.

In this article, I will go over the capabilities of a 12000-watt generator as well as some real-world examples. Let us venture into the basics, shall we?

Building site

Let us say you wish to deploy a 12000-watt generator on a job site where there are expectations of power outages.


It could even be a place where there are connections to the grid. A 12KW portable generator could be an excellent option in these situations.


From a 12000-watt generator, this generator will produce 9000 watts -9500 watts of net energy. You should also not use your generator at more than 75% of its capacity to avoid harming it. Indeed, it is critical.


A circle saw a handheld drill, compressed air, and a battery charger are common construction project appliances.


Used at home

A portable generator with a capacity of 12000 watts will suffice for a medium-sized residence. This massive portable generator might power some garage tools in addition to fulfilling the demand for your household appliances.

Lights are vital to running during a power loss, followed by air conditioners, refrigerators, freezers, electric cookers, coffee pots, sump pumps, and well pumps.

Appliances Charts

General Appliances

Appliances Watts (rated) in use With
a 60-watt light bulb 60 0
 70 watts light bulbs 70 0
1/3 HP sump pump 1140 2850
A 1/3 HP water well pump 575 1440




Fridge 700 220
625 watts microwave oven 625 0
A 1000 watts microwave oven 1000 0
Coffee maker 1000 0
Dishwasher 1500 1500
 8in element electric stove 2100 0
food processors 450 1
Toaster ovens 1250 1
Toasters 855 1




Laundry Tasks



Ironing 1250 0
Washing machines 1100 2200
Electric clothes dryers 5400 6750





Space heater 1800 0
13 Gal humidifier 175 0
 Blower-1/2 Furnace blower 700 1400
12,00 BTU window AC 3250 9750
BTU 10,000 Central AC 1600 4400
Central AC BTU 3700 11500
Heat Pumps 4800 4600



VCR 110 1
Stereo 440 1
27 inch Coloured Television 600 1
Video game systems 60 1
Systems 550 0
Electric grills 1550 0
FM/AM Radio 150 0
DVD/cd Player 110 0
Mobile Phones Charger 11 1


Bottom line

A portable generator is a must-have item when preparing for hurricane or ice storm season. This is, without a doubt, a lifesaver. However, you will need a different power system for commercial uses. As a result, using a generator to keep everything in order is a great idea.

You could get a 12000-watt generator if you have the means. It is unquestionably worthwhile. You will not have to worry about a power outage with this massive generator.


Can A 12kW Generator run my House?

Yes, a 12,000-watt generator qualifies as a “whole-home” generator. It can power refrigerators, freezers, electric appliances, air conditioning/HVAC, electric heaters, lights, and other electrical goods in addition to most equipment in the home.

The 12,000-watt generator may also be the first place where 50A receptacles appear. These receptacles are ideal for every home because they may help you save money and time.

Lights, fans, heaters, air conditioners, and other 120V or 240V equipment can all be connected to a single 50A receptacle.

Will a 12000-watt generator run a 3-ton air conditioner?

A three-ton central air conditioner utilizes 3500 watts in an hour, while a 12,000-watt window unit uses 1200 watts within an hour as a general rule.


Thus a 12000-watt generator is enough to run an air conditioner


How big of a generator do I need to run a house?

Even the most vital domestic equipment, such as a refrigerator, freezer, well pump, and lighting circuits, can be powered by a generator with a 5,000 to 7,500-watt output. All of these gadgets can be powered by a 7500-watt generator.


Is a 12000-watt generator good?


Twelve thousand watts is enough to power three to four power tools simultaneously without having to turn any off to start another. A generator with a run time of 5 to 10 hours is ideal for various applications on remote construction sites.


How much is a 12000-watt generator?


The cost of a generator will vary depending on the manufacturer, amenities provided, and wattage output. You should expect to pay roughly $1300-$1500 for most 12,000 watt generators.


Price increases can be attributed to higher quality and modern features, while price reductions attributions can be too minimalist.


It may not be accessible to power the central air conditioner with a 12 kW generator because you’ll need a 15 kW generator at the very least, but a 17 kW unit will ensure it.

Will a 12000-watt generator run a 4-ton AC unit?

Depending on the size of the house, a 3,000-square-foot home with two central air conditioners, an electric stove, and a Jacuzzi tub may demand 25kW to 30kW.

A “load-management system,” a generator that can power everything in your house except at the same time, is a newer choice.

How big of a generator do I need to run for A 3000 sq. ft. house?

You will need at least a 17 KW generator if you have a 4-ton air conditioner (40-amp, 48,000 BTUs). You will need at least a 20 KW generator if you have a 5-ton air conditioner (50-amp, 60,000 BTUs).

How do I calculate what size of generator I need?

Ø  Make a list of everything your backup generator should be able to power. Do not skip this stage because it varies widely based on the type of business you run.

Ø  At a retailing location, you might need to power any or total of your payment lights, terminals, security equipment, and mission-main data servers.

Ø  There may require lighting, telecommunications, security, and other basic infrastructure for an office building to safely allow people to exit the premises.

Ø  For food establishments, HVAC systems, refrigeration, and various equipment that need the power to protect foods from deteriorating should all be considered.

Ø  Pay special attention to life-saving systems, such as breathing and dialysis machines, in a healthcare facility or clinic.

Ø  When sizing a commercial generator, one-phase or three –phase voltage, power, and overall power release are all aspects to consider.


There is need for a reserve or surge capability is required in most commercial applications, especially for big motors run by numerous units independently.

·       With a clamp based on the ammeter on every leg of the electrical supply, determine the overall amps consumed by the organization.

·       Multiply the overall amps by 3 in the case of three-phase current and two in the case of single-phase current. To calculate the number of kilowatts needed, multiply the outcome by the supplying voltage, then by one thousand.

·       Subtract the kilowatt used by each emergency safety system from the kilowatts required to achieve total load kilowatts, as stated in NEC articles 700, 701, 702, and 708. (KW).

Overall amps multiply the supply voltage / 1,000 = total kW at the full load

Full load kW x 0.25 Equals reserve capacity.

Generator size equals total load kW plus reserve capacity for 100 per cent electricity.

How many watts do I need to power my house?

A typical home requires between 5000 and 7000 watts to important power items. Gives you the quantity of continuous or running watts your generator needs to produce.

How many watts do a 4-ton unit use?

The actual quantity of Watts required for a 4-ton air conditioner is determined by the unit’s make and model and how frequently it is used.

It requires 14,000 Watts, or 4 Kilowatts, to make a safe estimate. To ensure that you have enough power, utilize a 17 KW generator.

How big of a generator do I need to run a 12000 BTU air conditioner?

Between 990 and 1,335 watts are used by a 12,000 BTU air conditioner. Window air conditioners with 12,000 BTUs use about 1,060 watts on average.





About Steve Stuart

Steve Stuart is an electrical engineer who developed interest on generators during his school years. After school, he became a generator enthusiast. This is after encountering power supply problems at the area of residence where he lived. Power would be on and off and so food would go bad and the room heater would go off especially during winter. After trying the different generator brands for several years, Steve now provides information on the available brands and products in the market today. Based on his experience, he gives the do’s and the don’ts when it comes to generator use.

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