Some things I have learned. Always start the unit without a load. Once exaction voltage shows up then apply a load. Apply the load gently in stages not all at once a full load. If too much load is applied the unit will fall out of exaction and the voltage will drop to zero. I have found that this sometimes can cause the motor to loose residual magnetism and rezapping then becomes necessary. If you are not generating more than .2 volts or so then zapping will be needed.
Notes and Lessons learned on How to use an Induction Motor used as AC Generator
