Controller board

Need a controller that will have 4 DC motors connected (inputs) but will only allow current to pass through 1 and once that motor has x amount of volts passing though it (user defined) it allows the 2nd motor to connect and allow voltage to pass through it as well as the 1st motor until the 2nd motor reaches a certain voltage(user defined)then engage the 3rd motor and allow voltage to pass through it as well as the first 2 until the 3rd motor reaches a certain voltage (user defined) etc.. etc for up to 4 motors. This controller must also disengage the motors as they decline in voltage and reverse the action. Should be capable of continuous operation at very high voltages and amps. Up to 600v and 200amps. I'm not sure if the amps are as much an issue however voltage is. Would be great to monitor voltages somehow and all voltage that engage each motor should be user defined from 12 volts up to 600v. This needs hard wired inputs and outputs. Needs to be able to handle varying voltages input(pass through)from 1v to 600v. This will be used for a DC charging system using hydro system. As rpm increases so does voltage, if rpm/voltage gets high enough controller engages 2nd DC generator, if rpm can still go higher so does voltage so 3rd DC generator kicks in to make more power. But if adding addition generator slows rpm then that generator shall be disconnected from system. But there will need to be a buffer (lack of better word) so if rpm is to close it will not kick on and off to many times. Maybe a separate engage voltage and separate disengage voltage (User defined) would solve problem? Please quote me on this type controller, does not need to be boxed, can be just the board as long as I get a clear diagram. Please tell me how you would build this and the quality of the parts used so I know what I'm getting. I need you to explain how you would build this and how it would be controlled so I know you understand exactly what I need. We need to be on the same page for this project. I respond very fast so don't hesitate to email me. If this is not clear (I know it's not very clear) just ask me some questions and we'll work it out. Please be dependable and knowledgeable about these type controllers.