I applaud your efforts to want to make an EV. There should be more of you around, as the world would be a better place. With research and time, you will be able to answer all your questions. At first glance, you are faced with a couple challenges. In my humble opinion, your biggest obstacle is your vehicle choice. One method that can be helpful in deciding on what vehicle to convert is that if it is a big, bulky, fuel inefficient vehicle to begin with, it will be a big, bulky, hard to power vehicle as an electric. While an electric motor is way more efficient than an internal combustion engine, you still need to consider basic physics: the bigger and heavier, the more energy it will take to move it. Batteries can only hold so much energy......
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