Hmmmm, I have been doing some looking around, and have found some information concerning Amp production of Delco alternators at different ranges of RPMs. Here is a graph:



 This shows several Alternators, and the power production curve for each over the range of RPMs.

 From what I have learned here, my 100' of head plus my 20+ gallons of flow per minute should allow me to spin a alternator @2200 RPMs.
 My projected energy needs are 400 Amps per day, or 16.66 amps per hour, according to the chart I should be easily able to produce the needed power and more with the larger stock Delco alternators. And it looks like there will be room for more improvement.

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