Re: June 29, 95 mph winds

Posted by Dave G9N on July 23, 2023 at 13:40:02 from (24.220.196.59):

In Reply to: June 29, 95 mph winds posted by Geo-TH,In on July 23, 2023 at 03:42:39:

WGen5300DFcv - Dual Fuel with CO Sensor

Fuel used so far none. Had it almost a year.

While this is not helpful, I am going to make the point that running a generator with a much larger engine than needed will burn a lot more gas than a smaller engine for the same power.

You need a generator that is large enough for your needs, but excess capacity is expensive. I sized the generator to keep enough things running, but not as many as I would like. Running the AC or electric oven is out of the question for instance. I don't get so much hot weather here, and have gas heat because we do get cold. I got dual fuel because propane doesn't go bad like gasoline or diesel, and you don't have to drain the tank and carb every time you use it. For a little used backup, I paid more upfront to avoid a lot of maintenance down the line. Propane is more expensive, but gas is an option if I need to run for a long time.

You can estimate run time at full load by using the average efficiency of engines in general. For each 10 hp a gas engine will burn about 0.81 gallons per hour and a diesel will burn about 0.57 gph. At lower loads, the engine is less efficient, so the run time at half load is less than twice the full load run time. I calculated fuel consumption per horsepower hour for the advertised run times and they did show that the efficiency drops at lower loads. What it boils down to is that if you size your generator much larger than needed for the actual load, you fuel consumption will be high for the amount of power used.

Based on my generator's 5300 watts, the 274cc engine is running 7.1 hp, which assumes a 100% efficient generator. I calculated the fuel consumption for this generator under full load without correcting for the generator efficiency, which I don't know. It is less than 8 hours and the engine is putting out more than 7 hp. The point is that the advertised run times do show that the fuel consumption is higher under partial loads than it should be based on the power output alone.

Advertised fuel consumption

Code: Fuel Tank Capacity 4.7 gal. (18 L) Gasoline Run Time @ 25% 14.5 hrs Gasoline Run Time @ 50% 11 hrs. Propane Run Time @ 50% 9 hrs.

Theoretical

Code: gas full load 8.1 hr 0.5 lb/hp hr gas at 50% 11 hr 0.74 lb/hp hr gas at 25% 14.5 hr 1.1 lb/hp hr

So that's what the code button does. Never tried it before. Without using 'code' the tabs were single spaces.[/code]

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