baby AC/DC?
try another combination
fyi
a fuel cel just put out dc power,
the best and modern electric vehicle use ac motors, in fact three phase ac motors.
so the fuel cel output is "inputed" to a DC/AC converter, coming out with three hot wires (three phase)
then AC is "inputed" to a controller, to control speed (no multigear transmission needed)
your next assigment is to figure out how to sound Boooom, Boooomm