Diesel generator question: What is the typical fuel consumption rate of a 5kW, 10kW or 20kW unit at various load factors? How much does this vary (in litres per hour, or per day) between the same sizes of unit from different manufacturers?
I am doing the math to calculate the yearly operating costs for a telecommunications system to be installed in a third world nation.
The city has reliable 230V power approximately 75% of the time, which can be filtered and passed to equipment via a heavy duty voltage regulator and UPS system. That's not a problem.
The other 25% of the time, occurring randomly throughout the day there is no power whatsoever, frequently for extended periods in the middle of winter, or peak hours during summer when people are running their air conditioning. Thus the requirement for a generator.
The power budget for the whole system fits within 3/4 load factor on a 5kW generator. However we may end up with a larger unit such as 10kW to provide future expansion capability.
This Approximate Diesel Generator Fuel Consumption Chart found on Google provides basic info, but I don't know how much I can rely on it for accuracy. It covers 20kW units and above, but I don't know if a 10kW unit at 0.50 load would consume the same as a 20kW unit at 0.25 load factor...
I'm searching for a formula or chart from a major generator manufacturer saying something like "If you have a 10kW generator and operate it at Y percentage load factor for N hours, it will consume approximately Z litres of diesel per hour". The price of diesel fuel here is relatively stable, but I intend to estimate pessimistically for the price to rise 15-20% over the next 12 months.
Does anyone know how much the fuel consumption rate formula would vary between competing manufacturer's 5kW or 10kW units?