I'll take a guess....10 amps(approx) . I believe the battery is in that range . The alt might put out 15 or even 20 at full load maybe, but thats what a reg/rectifier is for . Hopefully this answers yer question .
I am going to have to modify the output to at least 1.1 Gigawatts in order to get the Flux Capacitor to operate, then I must get up to 88MPH in first gear for the envelope to allow my entrance into the continuum.