Marty, where in Central IL?During harvest here in central Il. we leave the combine(JD S780) in the field over night to get an early start.
It requires around 250 gl.of diesel to fill after a regular days run, some times more.
We have fuel/support trailer to facilitate this process,usually takes around 15 minutes to do this.
I have no idea how big a battery would be needed to match that "energy density"but I doubt it could be charged in 15 mins.