I think they may have emailed them to me. Mine is the largest one they seem to list, actually it is two welded back-to-back. Their alternator is a different design than most, both stator and field windings are stationary with a toothed wheel switching the flux, no brushes or slip rings at all. Mine produces about 180 amps at 1800 shaft RPM at the shunt into the batteries (somewhat more at the alternator shunt), and 280 at 2500, pretty closely matching the spec. I know the field takes about 15 or 20 amps to energize:at 800 rpm idle it will draw about that much, producing very little. What is one of the reasons I switch to the other, more conventional alternator when maneuvering (it runs at about 2.5:1 pulley ratio). The Electrodyne begins to produce positive current at about 1100 rpm. When I asked Electrodyne what maintenance was required they suggested repacking the bearings every 20,000 hours or so!