I'm a newbie to the forum, I have recently bought a watermill in south-
west france.  There are three francis turbines in place one of which 
is currently rigged up for electricity production.  When I spin up the 
turbine it produces nothing because the alternator is not exciting 
itself.  I can excite it with a car battery and it works but as soon 
as I remove the battery it stops working and with the load removed the 
turbine overspins.  My question is, how can I research the problem and 
could a solution be to feed the excitation coil directly from the grid?

Many thanks...Alastair Trower








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