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Using an ICE to power a electric motor?

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I know this is used in trucks and trains but I thought it would be an interesting idea to explore for my tank build. I'm using the gs450H which you can get spinning at 40v but can go all the way up to 600v with a boost converter. My plan is around 300v and what ever amps it needs. It then goes to transfer box then to the open diff brake system. I only plan to get to 25-35MPH.
Any who, I think it would be cool to use a 1000cc motorcycle engine(already have one) and hook it up to some sort of generator and power the motor itself. The only thing is, I have no idea how to go about doing that. What generator would you use and such. Google doesn't seem to pull anything up then actual generators from like home depot and such. In a sense it would be a hybrid which would be really cool to tell people its a hybrid tank :D. Have the cool sounds of a motorcycle engine and 250kw of torque from the 2 electric motors.
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This doesn't make any sense at all.

Amps isn't "whatever it takes"...the motor cartridge in there is good for 300A...do you really need 90kW (about 120hp) of power? You need to figure out how much HP you need to run 25MPH and do your calcs from there, not "whatever".

Boost is also a very bad idea...it's lossy and the current input on the low voltage side is ampere hell.

Get the battery rightsized for the job or you'll be cooking thanksgiving turkey in your tank tracked oven.
 
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