1. The choice of the electric cable
The choice of the electric cable depends on the allowable current of the cable
and the distance between the load and the generator. And the cable section
should be big enough.
If the current in the cable is bigger than the allowable current, it will become over
hot and the cable will be burnt. If the cable is long and thin, the input voltage of
the electric appliance will be not enough, causing that the generator doesn't start.
In the following formula, you can calculate the value of the potential "e".