How To Determine The Power Of A Backup Generator

When the power goes out, a backup generator can keep your home supplied with electricity. But how do you determine how much power you need? There are a number of factors to consider when sizing a backup generator for your home. Keep reading to find out more.

How Do You Calculate The Power Of A Generator?

Generators have a limited output capacity, which is measured in watts. Watts are computed by multiplying the voltage by the amperage (Watts = Volts x Amps) of the electrical equipment under consideration.

Volts x Amps x Watts = Power

To figure out how much electricity your house would consume during a power outage, add up the Total Watts. To calculate kilowatts, multiply the total wattage by 1000. Add a safety buffer of 1.25 kilowatts to the kilowatts to provide for future power requirements. For your residence, this is the minimum Generator Capacity.

How Much Power Does A Backup Generator Produce?

While the biggest portable generators provide roughly 17 kilowatts of clean electricity to handle all your appliances, including delicate electronics, backup generators may generate 150 kilowatts or more. They must do so in order to keep your complete home running for days or even weeks.

What Will A 7.5 kW Generator Run?

A 7500-watt generator can power most home appliances, including your refrigerator, hot water heater, well pump, freezer, light, and oven, depending on the devices you have.

Related Questions and Answers

What will an 8kw generator power?

Its constant output is rated at 8000 watts, with a 10-kilowatt surge capability. This is the equivalent of four 15-amp convenience circuits in a contemporary house, plus extra power for starting air conditioners or pumps. Watts (W) and Kilowatts (kW) are the units of power measurement (kW).

Is It Easy To Hook Up A Portable Generator?

There are in fact easy ways to hook up a portable generator. This video should help:

What size generator do I need for a 220 pump?

You can operate a 3/4-hp 220v pump with a 4000-watt generator.

How do I calculate wattage?

When it comes to calculating wattage, the calculation is as follows: W (joules per second) = A (coulombs per second) x A (volts per second). Wattage is the amount of electricity generated or used in a second. A 60-watt light bulb, for example, consumes 60 joules per second.

How do I calculate generator fuel consumption?

What is the simplest formula for determining a diesel generator’s fuel consumption? In order to estimate the amount of fuel used, multiply the kWh output by 0.27 to get the liters used.

What can a 10 kVA generator power?

A 10 kva generator that is on-site can power a refrigerator, microwave, six lights, two TVs, two air conditioners, three computers, a monitor, and one printer.

How many Amps can an 8000-watt generator run?

An 8-kilowatt generator can provide up to 8,050W of power at 240V, which equates to around 33A per phase, or about 66A per phase at 120V.

Can a 6500w generator power a house?

Generators of this size are capable of running a wide range of domestic equipment, including refrigerators and television sets.


Determining the power you need from your backup generator is not difficult if you know the right equation. Once you figure this out, you are on your way to increased home safety.

The “what size generator do I need for a 1,500 square foot house” is a question that many people have. To answer this question, you will need to find the wattage that your system requires.

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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