How Much Home Backup Power Do I Need?

Having home backup power can keep your home running when the grid fails. But how much home backup power do you really need? Here’s a quick guide to help you determine the answer.

Estimating How Much Electricity You Need

To estimate how much electricity your house will require if there is a power outage, add up the total watts. To calculate kilowatts, multiply the total wattage by a factor of 1000. Calculate kilowatts multiplied by 1.25 as a safety measure and for future power requirements. For your residence, this is the minimum Generator Capacity.

How Many Watts Do I Need To Power My House?

How many watts of electricity does an average-sized home require to run the necessities? Essential things in a normal house need between 5000 and 7500 watts of electricity to operate.

How Many kW Do I Need For A Whole House Generator?

To convert watts to kilowatts, multiply the wattage by 1,000. Select a generator output that is 20 to 25 percent greater than the peak load when making your selection (for example, if the total expected wattage is about 22 kilowatts, choose a 27 kW generator).

Related Questions And Answers

Will a 30kW generator run my house?

A 20kw generator is insufficient for the average home’s power requirements, which range from 25 to 40 kilowatts. Most American homes need anywhere between 30 and 50 kilowatts of electricity to meet their most basic electrical requirements. Your home’s power supply has to be protected by at least a 30 kW generator if the grid goes down

What is a cheap home backup power option?

Check out this video for more information:

Does a whole house generator add value to your home?

Installing a backup generator may yield a 150% return on your investment, according to a 2014 analysis by Remodeling Magazine, while Consumer Reports estimates that a full house generator can boost your home’s value by 5%.

What will an 8kw generator power?

With an output of up to 8000 watts of continuous power and a peak surge power of 10 kW, this sized generator has plenty of juice. Powerful enough to run four 15-amp convenience circuits in a contemporary house, as well as extra power to start air conditioners or pumps.

What can a 5.5 KVA generator power?

When it comes to powering your home’s refrigerator and a few other appliances such as a TV and some lights, a 5.5kVA can do the trick.

How do you plug a generator into your house?

The gen cable is easily plugged into the generator’s 20- or 30-amp outlet. Starting at the other end, you may begin attaching more extension cables securely inside your home.

How many watts does a 2000-square-foot house use?

A 2,000-square-foot house may use a 4,000-watt solar array. A system of this size might include anywhere from 12 to 18 solar panels, depending on the kind of panel you choose. Just keep in mind that the algorithm used to estimate your power use might change based on your electrical service provider!

Can a portable generator power a whole house?

Your home’s circuit breaker panel should be equipped with an interlock mechanism or transfer switch so that you may use the generator to power a full circuit instead of plugging in individual items.

Will a 9500-watt generator run my house?

Having a starting wattage of 12,000 and a running wattage of 9500, this unit is capable of powering all of your appliances in the event of a power outage.

How long can a Generac whole house generator run continuously?

It is estimated that a 1,000-gallon tank of diesel would last around 17 weeks with a generator that produces 10 kW at half-load.


The amount of home backup power you will need depends on how much energy you require to run your household. If you follow a few simple calculations, this should be an easy number to find out.

The “what size generator do I need” is a question that has been asked many times. There are many different factors to consider when determining how much power you will need.

NEXT UP: Home Backup Generator – Gasoline Or Diesel?

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Leon Ashcraft
About Leon Ashcraft

Leon Ashcraft is a Safety Instructor and consultant in Colorado with focus on OSHA, environmental health and safety, transportation safety, oil & gas, rescue operations and construction safety. Learn more about Leon here or connect with him on Twitter | LinkedIn | Medium