Originally Posted by Viking Sailor
Your numbers are a bit high.
Shaft driven alternators are intended for use on long passages of many days.
A shaft driven alternator only needs to but out something like 5 amps to be useful. Five amps per hour is 120 amp hours per day. Which is a very useful amount of power. And, this would be achieved with less then a tenth of a horsepower worth of drag.
I have seen a suggestion that using a 24 volt alternator with a 12 volt regulator
, and a 3:1 pulley system might make a practical 12 volt charging
source. However, there were no details about prop size or shaft rpm
requirements. So, some experimentation would naturally be required to get the proper voltage and current
I have been trying to soak up as much info on this subject and one thing I have not seen discussed is what happens when the motor
gets turned on and does that create too many rpms for the alt that's hooked to the shaft. Also...other than the built in regulator
in the alt, would there need to be some other kind of controller to guard against over charging