How much fuel does a 250 kVA generator use?
250 kVA Generator with 51.4L/h (100% load) fuel consumption. QAS diesel generators are high quality heavy duty industrial generators.
150 kVA Generator with 30.6L/h (100% load) fuel consumption.
A standard 5-kilowatt generator will typically consume about 0.75 gallons per hour. As of July 2018, the average price for gasoline is $2.89 a gallon in the United States. If you ran the portable generator for a day, that would consume about 18 gallons, meaning the cost to run the generator would be around $52 a day.
Generator Size (kW) | 1/4 Load (gal/hr) | 1/2 Load (gal/hr) |
---|---|---|
300 | 6.8 | 11.3 |
350 | 7.9 | 13.1 |
400 | 8.9 | 14.9 |
500 | 11.0 | 18.5 |
Watts = Volts x Amps
Companies use watts to rate a generator's output. The wattage is calculated by multiplying the voltage by the electrical device's load capacity in amperage (Watts = Volts x Amps). For example, a generator may be listed as 1,500 watts delivering 120 volts.
Generator Size (kW) | ¼ Load (per hour) | Full Load (per hour) |
---|---|---|
250 | 5.7 gal/hr21.5 ltr/hr | 18.0 gal/hr68.1 ltr/hr |
300 | 6.8 gal/hr25.7 ltr/hr | 21.5 gal/hr81.3 ltr/hr |
350 | 7.9 gal/hr29.9 ltr/hr | 25.1 gal/hr95.0 ltr/hr |
400 | 8.9 gal/hr33.6 ltr/hr | 28.6 gal/hr108.2 ltr/hr |
To sum up, a portable gasoline generator can run continuously on a tank of gas but not longer without stopping. Typically 12-18 hours. Using a large propane tank, you will find that your limiting factor is probably mechanical in nature (typically engine oil). For most propane generators that means around 5-8 days.
Generator operating costs
With high availability and reliability, they can be 30-50% cheaper to run than other options. The downside is if your power or gas supply went out at the same time then the generator would not run without fuel being added manually.
60 kVA generator with 14L/h (100% load) fuel consumption. QAS diesel generators are high quality heavy duty industrial generators. They are tough which means that they can be used as a permanent source of power or moved regularly.
How do I calculate generator fuel consumption?
You can ESTIMATE the fuel consumption by multiplying the energy out (kWh) by 0.27 to get litres consumed. If it is a very small diesel (under 10 kW) then maybe closer to 0.3 litres per kWh and if it is a modern, high-speed, diesel over 900 kW then closer to 0.26 litres per kWh.
The KVA of a generator required to run your home comfortably; For an average home, the required KVA should be at least 3 KVA to 5 KVA. With this power in a generator, you will comfortably be able to run all your household appliances. This includes your ACs and Fridge, as well as other items that use a heavy duty point.

Please note that when a generator is used for bigger loads, the fuel consumption will be higher. When it is used for loads below 50 percent, the fuel consumption will be significantly lower. The generator is a reliable backup source of electricity when the regular supply is interrupted.
Theoretically, a generator can continue running as long as it has fuel to do so. However, some fuels might be more difficult to obtain a continuous supply of during a natural disaster or other emergency. In essence, you can keep your generator running as long as you have access to the fuel needed to run it.
In theory, standby generators will run indefinitely or for however long fuel is supplied to the generator. Most standby generators are fueled by natural gas (NG) and, thus, there is no need for a fuel tank since there is an endless supply of NG from your utility company.
Yes, portable generators can run continuously as long as proper maintenance intervals are given; since gasoline is highly flammable, you'll want to stop the engine before fueling or refueling any generator.
Rating | 350 kW (437 kVA) Standby |
---|---|
Frequency | 60 Hz |
Voltage | 208 to 600V |
Electrical (@ 0.8 PF) | 1214 amps at 208V 3P 526 amps at 480V 3P 421 amps at 600V 3P |
Fuel Consumption | 95.7 L/hr @ 100% load 73.4 L/hr @ 75% load 52.3 L/hr @ 50% load |
For sets >150 kVA rating, the number of litres per hour used is approximately 1/5th of the rating of the set in kVA. (e.g. a 500 kVA unit will use approximately 100 L/h). For sets <150 kVA rating, this figures rises to 1/4th of the rating of the set in kVA (e.g. a 100 kVA unit will use approximately 25 L/h).
40 Kva Generator 415/3/50 Mwk50hr Rate POA | 150 Kva Generator 415/3/50 Mwkunl Rate POA | |
---|---|---|
Fuel Consumption 100% load [L per hr at 50Hz] | 9.96 | 34.90 |
Fuel Tank Capacity: Ltrs | 216 | 940 |
Fuel Type | Diesel | Diesel |
Height: mm | 1,582 | 2,050 |
Standby Power Rating | 200 kVA / 160 kW |
---|---|
Fuel Consumption | 43.8 litres per hour (at 100% load) |
Dimensions (L x W x H) | 3325mm x 1134mm x 1666mm |
Dry Weight | 1,931kg |
Canopy Noise Level | 80 dB(A) at 1m |
What is the price of 200 kVA transformer?
market price of 200 Kva Transformers in India is Rs 1.6 Lakh/ Piece.
250 kVA Cummins Diesel Generator, Voltage: 415 V at Rs 1200000/piece in Jaipur.
Genset Rating | kVA | 100 |
---|---|---|
Type of cooling | - | Water Cooled |
Fuel Tank Capacity | L | 250 |
Fuel Consumption at 100% load* | L/h | 22.16 |
Fuel Consumption at 75% load* | L/h | 16.90 |
Generator running load.
Running a generator on natural gas will cost you anywhere from $0.02 to $2.41 per hour (1,000W 25% load generator to 30,000W 100% load, respectively). It will consume anywhere from 1.86 ft3 to 222.90 ft3 of natural gas per hour.
Most portable generators consume about three-quarters of a gallon of gas per hour. So, factoring in an average price per gallon of about $2.75 and a 12-hour day, that's about $33 per day to run your generator.
24kW Fuel Economy
At a full load of 24kW, the generator uses 203 cubic feet of natural gas per hour while the 22kW uses 228 cubic feet to produce 22kW.
Most references on how much gasoline a generator uses report averages of three-quarters a gallon per hour at normal load. The more power required of the engine, the more gasoline it will use.
Diesel-powered generators tend to be more fuel-efficient than petrol ones, with a 120kW diesel generator achieving an efficiency of between 10.9 and 32.1 litres per hour depending on its load, which is considerably better than a petrol generator.
Do not operate the generator in wet conditions such as rain or snow. The generator must be properly grounded. If the generator is not grounded, you run the risk of electrocution.
Standby generators not limited by fuel supply can run continuously for for up to 500 hours, this is 3 weeks of continuous use. This is dependent on your standby generator's manufacturer recommendations, but at 21 days it is recommended you allow you standby generator to cool and perform general maintenance.
Do generators need a break?
During a prolonged power outage, you may need to give your generator a break. Air cooled generators, especially need a break and you can talk to your generator installer about the frequency in which you would need to give an air cooled generator a break during a prolonged outage.
Most gas-powered generators are going to stay running for anywhere from a few hours to up to 24 hours. However, some portable gas-powered generators have a large fuel tank. These generators are good enough to last for a few days.
8) How much does it cost a month to run the generator when it runs for 10 minutes a week? Depending on the price of natural gas, it shouldn't cost more than $5 or $10 per month to run the unit in exercise mode. During a power outage, under 50% load expect to pay around $20-$40/day for gas usage.
And there is some very good news for the planet: Solar and wind power, at the scale that a major utility would deploy them, are now the cheapest form of power. They're a bit less expensive than natural gas-fired power plants and considerably cheaper than coal and nuclear.
kW or kilowatt is a unit of electric power. It is equal to 1,000 Joules per second and it measures how fast the energy is transferred. That means that in DC circuits, 1 kVA is equal to 1 kW. That means that 1 kVA is equal to 1,000 watts.
On average, you can expect a five-gallon gasoline generator to consume at least 0.75 gallons per hour.
Generator Size (kW) | ¼ Load (per hour) | Full Load (per hour) |
---|---|---|
250 | 5.7 gal/hr21.5 ltr/hr | 18.0 gal/hr68.1 ltr/hr |
300 | 6.8 gal/hr25.7 ltr/hr | 21.5 gal/hr81.3 ltr/hr |
350 | 7.9 gal/hr29.9 ltr/hr | 25.1 gal/hr95.0 ltr/hr |
400 | 8.9 gal/hr33.6 ltr/hr | 28.6 gal/hr108.2 ltr/hr |
Rating | 350 kW (437 kVA) Standby |
---|---|
Frequency | 60 Hz |
Voltage | 208 to 600V |
Electrical (@ 0.8 PF) | 1214 amps at 208V 3P 526 amps at 480V 3P 421 amps at 600V 3P |
Fuel Consumption | 95.7 L/hr @ 100% load 73.4 L/hr @ 75% load 52.3 L/hr @ 50% load |
A 20-kilowatt diesel generator uses approximately 1.6 gallons per hour. Many homeowners and property owners prefer to have a diesel generator because the fuel is less flammable compared to other fuel options and safer to store.
On average, it takes 0.12 litres of petrol to generate 1kWh of power, meaning smaller households use 0.08 litres per hour of generator use, higher-energy homes use 0.14 litres per hour, and houses on the high-end of energy consumption use 0.22 litres per hour.
How do you calculate the fuel consumption of a generator?
For example, if a 50-kW generator consumes 8.48 L/hr at 25 kW output, and 15.3 L/hr at rated output, the slope of the fuel curve is (15.3-8.48)/(50-25) = 0.273 L/hr/kWoutput. This fuel curve is plotted below. The Fuel Curve Calculator helps calculate the fuel curve slope and intercept coefficient.
Please note that when a generator is used for bigger loads, the fuel consumption will be higher. When it is used for loads below 50 percent, the fuel consumption will be significantly lower. The generator is a reliable backup source of electricity when the regular supply is interrupted.
Watts = Volts x Amps
Companies use watts to rate a generator's output. The wattage is calculated by multiplying the voltage by the electrical device's load capacity in amperage (Watts = Volts x Amps). For example, a generator may be listed as 1,500 watts delivering 120 volts.
Standby Ratings | 125kW / 150kW / 175kW / 200kW |
---|---|
Voltage | 220V/240V/440V/480V/600V |
Frequency | 60 Hz |
Dimensions | 93 x 44 x 51 inches |
Weight | 2570 lbs |
40 Kva Generator 415/3/50 Mwk50hr Rate POA | 150 Kva Generator 415/3/50 Mwkunl Rate POA | |
---|---|---|
Fuel Consumption 100% load [L per hr at 50Hz] | 9.96 | 34.90 |
Fuel Tank Capacity: Ltrs | 216 | 940 |
Fuel Type | Diesel | Diesel |
Height: mm | 1,582 | 2,050 |
60 kVA generator with 14L/h (100% load) fuel consumption. QAS diesel generators are high quality heavy duty industrial generators.
Most diesel generators have a 24-hour fuel tank, although 48- and 72-hour fuel tanks are available. If your generator is diesel or LP, you probably already have a relationship with a refueling service that will stop by your home or business to top off your tank.
On average, a standby generator can run for up to 3,000 hours powering a medium-sized home, though it is recommended you do not run a generator for longer than 500 hours continuously.
24kW Fuel Economy
At a full load of 24kW, the generator uses 203 cubic feet of natural gas per hour while the 22kW uses 228 cubic feet to produce 22kW.
Most portable generators consume about three-quarters of a gallon of gas per hour. So, factoring in an average price per gallon of about $2.75 and a 12-hour day, that's about $33 per day to run your generator.
Why do generators use so much petrol?
Accumulation of the carbon deposits on the engine can cause excessive consumption of fuel. Therefore, you need to remove them on time and clean your generator using a gentle chemical detergent, or you can handwash the components.
By overloading the generator with an increase in demand for power than recommended, it will result in an increase in power demand and ultimately require an increase in fuel consumption.