just go to the dmv and register it if they ask if it will go over 30 tell them no
for electrics the federal law says if its under 750 watts has working pedals and goes less than 20 mph it is not required to be registered
but even if its over 750 watts and goes over 20 mph theres not really any way they will know
if it doesnt have pedals like an Ego or Emax then it gets registered as a moped