Since you say you want to build from scratch, and not convert an ICE car, you may want to read the following report that I found for a small EV.
http://www.ohio.edu/mechanical/design/projects/team2_design_report_final.pdf
You can scale up to meet your desires. 250-300 kW is a lot of power for an electric motor, and is equivalent to a 1000 HP (peak) ICE. So that is the realm of serious racing cars and dragsters, or heavy trucks and buses.
If you are really just starting out with little experience in electrical and mechanical engineering, I would suggest first "cutting your teeth" on a small test project, which could be a bike or a tractor or golf cart. You should be able to get something up and running in a few months and the experience will carry over to your main project. You can afford to make mistakes and start over a few times if you are building a $300 bike or a $600 tractor, but for a monster like you are planning, mistakes can be costly and quite dangerous!
Good luck, have fun, learn much, and be safe!
http://www.ohio.edu/mechanical/design/projects/team2_design_report_final.pdf
You can scale up to meet your desires. 250-300 kW is a lot of power for an electric motor, and is equivalent to a 1000 HP (peak) ICE. So that is the realm of serious racing cars and dragsters, or heavy trucks and buses.
If you are really just starting out with little experience in electrical and mechanical engineering, I would suggest first "cutting your teeth" on a small test project, which could be a bike or a tractor or golf cart. You should be able to get something up and running in a few months and the experience will carry over to your main project. You can afford to make mistakes and start over a few times if you are building a $300 bike or a $600 tractor, but for a monster like you are planning, mistakes can be costly and quite dangerous!
Good luck, have fun, learn much, and be safe!
