ORIGINAL: RCVFR
ORIGINAL: Roary m
I run a Dynatron with a couple of 12v gel cells wired in series. I wouldn't bother with 12v with anything over a 40.
Greater voltage gives greater speed on the starter. Greater Amps give more "grunt" (torque). Bigger engines need more grunt.
While this might be true, it's important to note that total power is a function of both current and voltage. The total power available at 12V is not as high as it is at 24V. In addition, the wiring within the motor limits the amount of current that motor can handle. Exceed the capacity of the motor windings and you'll burn it out. Increasing the voltage reduces the current requirements as well as increasing the total power.
In more practical terms, no matter how big a battery Iuse, Ican use my hand to stall my starter when it's on 12V. When I try the same with 24V, Iget a friction burn.