This will vary dramatically based on the generator and the load. The average 10-kilowatt generator will consume a little under a gallon an hour at full load, while a heavy-duty 200-kilowatt generator will likely consume up to 15 gallons per hour. Consult the product manual for detailed specifications on the generator’s fuel consumption rate. Check out our Project Uptime article, Hydrogen Generators: An Emissions-Free Solution to Portable Power.