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Hi Daniel,
I have made further investigations with the Nema 23, connected capacitors but nothing improved, still the same 0.5A for a little bit more V (48)...

I have to test with a Nema 11 but as I need at least 12V to have useful current to charge the battery :-/

Maybe an axial flux generator could achieve better efficiency at low speed ?
I have read you tested building your own generator but you didn't have useful current. I have seen your pictures, the problem is that you have no iron in your generator.

I have seen interesting designs for axial flux generators but they lack iron backing...