If the compressor is currently being operated with a 25HP motor. Then the compressor only requires 25-27.5 HP to run steady state. Where the confusion arises is that a 25HP electric motor can make 50-60HP for brief periods of time. While these brief demands can be handled with the electric motor. These overloads will bring a 25HP gas or diesel to a quick stall. Hence a 40Hp minimum diesel engine with good torque rise is required to replace a 25HP electric motor. This will handle a brief torque demands a "50HP" peak load requires. A 40-50HP turbo diesel will loaf along at 25HP burning less fuel than a 50HP natural aspirated diesel. The turbo engine doesn't pump extra air when it isn't required. Being it's a reciprocating compressor that is always spinning at 100% speed. There is no real surge when the unloaded calls for air. Compared to rolling a reciprocating compressor from 0 to full rated rpms. 40HP is lots and 50HP is wasting fuel. A 25HP diesel running a max output with a wee trace of black in the exhaust. Will burn less fuel than a 50HP diesel on the same 25HP load. Ask jdemaris to backup the data.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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