Quote:
Originally Posted by phillipandtabby
How much horsepower does an alternator pull ? You can mathematically determine the horsepower cost at any given load. (Remember, alternators respond to load. If there is no load present the alternator is basically freewheeling.)
Amps x Volts = Watts
Watts / 745.7 (one HP) = Electrical HP Produced by the Alternator
HP x 15% Efficiency Loss = HP Loss
HP + HP Loss = Total HP Used
Example:
57A x 14.9V = 849.3 Watts
849.3 Watts / 745.7 = 1.14 HP
1.14 HP x 15% = 0.17 HP
1.14 + 0.17 = 1.31 HP Total
Now we know the cost to run the electrical system. The most important question is what is the payback ? Which way does the horsepower benefit you ?
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good job thread jesus...........
anyways alternator is more than 57A. for our aleros is 102A.
1519.8 Watts
1519.8/ 745.7 = 2.038 HP
2.038 X 15% = 0.3057
2.038 + 0.3057 = 2.3427 HP total
also don't forget about A/c compressor uses hp and everything else that is driven by the crank via belt.