Hi there Peter, Can I ask - how are you acheiving motor control in all of this. Do you have a PWM unit lined up such as 4QD supply, or are you thinking of using a large resistance, or something else? Also, do you have any details from the makers/ratings plate on the alternator? Yours, Rich. On Wed, 30 Mar 2005, Peter Sheppard wrote: > John, > > Thanks for that. > > I note the use of the diode, but shouldn't it be the +ive terminal to the > battery ? (the pointy end!) > > With regard to the petrol/electric bit, my main concern is that when the motor > is pulling serious current (it limits at 96A on 24v dc) then the alternator > will try and fill that gap (or at least it will try until it current limits). > > I only have a 3/4 hp petrol engine driving the alternator, so I have visions > that it may stall. The only thing I suppose is to try it. I have no idea > what > the maximum charge current of a 24v alternator is - any suggestions? > > Cheers > > Peter MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.