hi, my name is karthik. i am a student and have taken a project. i am planning to convert a 22 seater mini bus to electric. it produces max power of 70 hp at 3000rpm and max torque of 222 N-m at 1750-2000rpm. max gradeability is 30%. final drive ratio is 6.574:1. max speed i am looking at is 70kmph. avg speed is 40kmph. what power motor do you suggest to use? i am planninig to use brushless dc motor. also what voltage motor to use? what batteries to use? how many of them? what Ah value? i am thinking of 12V lead acid batteries but not able to calculate the Ah value. the vehicle travels around 6hrs a day and covering 240 km. please reply as soon as possible.