If it hasn't got 5v on the cover then it isn't a 30v.
Have a look in the trunk, on the right hand side of the spare wheel well there is the datasticker which lists all the specifications of the vehicle (including any options installed). About 4 lines down it will specify the power output in kWatts. If it is 110kW then its a 12v, if its 142kW its a 30v (1.35 bhp to 1 kW)