Curtis, the mainstay of the EV industry. The 1231C is the top of the range Curtis controller. Suited for most motors this controller will power vehicles up to 2 tonnes.Comes in 120V and 144V with mounting brackets.120VOperating voltage: 72V to 120VPeak current: 550AContinuous current: 225A144VOperating voltage: 96V to 144VPeak current: 500AContinuous current: 225A