I am trying to compare fuel consumption ratings on Diesel electric generators
The american ones show gals per hour of consumption at 50% load 75% load & 100% load which is what I am familiar with.
All the other generator sets are rated by g/kwh which I think is grams per Kilowatt hour?
What I'm having trouble with is a gram is a weight not a volume? Do I multiply the total kilowatt hours which in this case is 60kw x the grams per hour(in this case 230) 60x230=13,800 grams
Do I have to figure out what a gal of diesel fuel wieghs? and the convert the grams to weight?
Any help would be great.
Thanks A+
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Originally posted by anoush farzad View PostHow about 3 phases generators? i need to convert 200 g/kWh to L/h in this generator plz help me.
613 kW 1500 rpm 220 V
Any help would be great.
613 kW·h/h 200 g/kW·h = 122.6 kg/h fuel consumption
Divide by density of fuel. If diesel, density will be near 0.84 kg/L, so 146 L/h
Fuel consumption will be less when output is less than rated power.

How about 3 phases generators? i need to convert 200 g/kWh to L/h in this generator plz help me.
613 kW 1500 rpm 220 V
Any help would be great.
Last edited by anoush farzad; 09302015, 09:18 PM.
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Guest repliedRe: g/kwh to gal/h
necesito convertir 235 g/kw.h en g/h cuanto es eso.
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Guest repliedRe: g/kwh to gal/h
Originally posted by JohnS View Post210.2 g/kWh x 2650 kW x 1 t/10^6 g = 0.557 t/h
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Guest repliedRe: g/kwh to gal/h
If a 2650 kW Main Engine has a fuel consumption of 210.2 g/kWh at full load. How much it will be at t/h ? Thanks
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Guest repliedRe: g/kwh to gal/h
each KWh will consume 0.31 liters for small machines ( under 50 KVA ) , 0.26 to 0.28 for mid machines under 250 KVA , and 0.252 litres for large machines , for DS#2 fuel
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Guest repliedRe: g/kwh to gal/h
There are 453.6 grams per pound.
230 g/kw hr = ( 230/453.6 ) lb/kw hr ~= 0.507 lbm/kwhr
There are approximately 7.4 pounds / gallon for #2 D diesel fuel
0.507 lbm/kwhr / 7.4 lbm / gal ~= 0.069 gal / kwhr
If 60 kw, then hourly fuel oil usage ~= 0.069 x 60 kw ( kw drops out ) = 4.11 gal/hr
The reciprocal of "gal/kwhr" i.e. "kwhr/ gal" is a more used term of electric generator efficiency using diesel engines.
In this case 1 / 0.069 ~= 14.5 kwhr / gal. a very competitive level.
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Re: g/kwh to gal/h
Originally posted by Unregistered View Posthow to compute kwh/liter?
It varies with the heat content of the fuel and the efficiency of the engine. For a particular engine and fuel, it varies considerably with torque and rpm (the plot is called an engine map, and shows brake specific fuel consumption contours vs torque and rpm).
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Guest repliedRe: g/kwh to gal/h
how to compute kwh/liter?
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Guest repliedRe: g/kwh to gal/h
may i know in the previous calculation whether you consider the efficiency already? i looks the genset has a round 50% efficiency.
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Guest repliedRe: g/kwh to gal/h
If a 500 kW diesel generator has a fuel consumption of 208 g/kWh at full load. How much it will be at 50% and 25% load? Thanks
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Guest repliedRe: g/kwh to gal/h
Right you are. Thanks for the clarification.
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Re: g/kwh to gal/h
Originally posted by Unregistered View PostJohnS, in your last post you divided 4.16 by 0.85 to get 4.9. Shouldn't you have multiplied 4.16 by 0.85 to get 3.54............or am I mixed up?
I recommend always leaving the units attached to the numbers and working the units cancellation; it is always clear whether to multiply or divide. You can still make errors by using wrong conversion factors, but it is much easier to check all the inputs to the calculation.
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