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#12
04-23-2026, 10:10 AM
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In alternator design, there is always a trade off between cut-in speed (shaft speed where the alt starts to provide output) and max output current.
The larger diameter of a 12SI helps improve the cut-in speed (all else being equal), advantage to the 12SI. The larger fan helps cooling, also. Alternator losses due to internal heat, friction, and windage can amount to about 50%. George
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