That is an American Engines PedalPower electric tricycle.
It uses two 12 Volt batteries to make a 24 Volt battery pack. We recommend using a 24 Volt 1000 Watt controller such as our SPD-241000 with that trike.
If it still has the original loop style handlebar then a hand throttle will not fit onto it, however, a foot throttle could be used or new handlebars that a hand throttle fits onto could be installed.
Dean G Bagley