Quick Answer
Diesel generators generally have a higher fuel efficiency compared to gas generators, with a typical fuel-to-power ratio of 0.3-0.4 pounds per kilowatt-hour for diesel versus 0.5-0.6 pounds per kilowatt-hour for gas.
Diesel vs Gas Generator Fuel Efficiency
Diesel generators are often preferred for off-grid power generation due to their higher fuel efficiency. This efficiency translates to lower fuel costs and extended periods of operation between refueling. For example, a 20-kilowatt diesel generator can run for up to 12 hours on a single 30-gallon tank of diesel fuel, whereas a similar gas generator may only operate for 6 hours on a 30-gallon tank of propane.
Calculating Fuel Costs
To calculate the cost of fuel for a generator, you’ll need to consider the cost of the fuel itself, as well as the generator’s efficiency. Assuming a cost of $3.50 per gallon for diesel and $2.50 per gallon for propane, the cost of fuel for the 20-kilowatt diesel generator mentioned above would be approximately $1.75 per hour (based on a 30-gallon tank and 12 hours of operation). In contrast, the cost of fuel for the gas generator would be approximately $2.50 per hour (based on a 30-gallon tank and 6 hours of operation).
Maintenance Expenses and Cost per Kilowatt
While diesel generators may have higher upfront costs than gas generators, they can offer longer lifespans and lower maintenance expenses over time. In general, diesel generators require less maintenance than gas generators, with fewer components to replace and less risk of oil contamination. When considering the cost per kilowatt, diesel generators may offer a more cost-effective option in the long run.
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