So at 100 ft head velocity will be less than root (64 x 100) or 80ft/sec.
The pitch circumference of the wheel is 4 x 3.14 " just over 1ft.
Speed will be 80 rps approx max theoretical on no load. Probably run at half that so that gives 40 x 60 rps or 2400 rpm. Nicely within the range of a car alternator assuming you are using 12v.
Don't know how long bearings will last in such close proximity to water and continuous duty.
Flux[ Parent ]
I would be building a frame with a waterproof shield to keep the alternator dry and isolated from the turbine. I suppose that if I had to change the alternator out every few years, or replace the bearings, that is a expense I can deal with. But I can't deal with the price gouging going on these days on this type of equipment.
I'm going to pick up some good books on the subject so I can understand the engineering a bit better, but you have certainly given me hope, thanks!
I would also be interested to hear from anyone who may have done something like I am describing.[ Parent ]
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.[ Parent ]
