As you can most likely imagion the star/delta swithing for a genny could be acomplished in the same fashion. Most will point out that mechanical relays could accomplish the same task, and since the swithing frequency(in and out from star to delta) would be like once an hour or something like that, burning up the contact point's in the relay is not a major concern. But it is very hard to compete with a mosfet(solidstate dc relay) in terms of the power req'd to energise it. Compared to a mechanical relay(like a auto starter soleniod) mosfets use way less power to energize. Im very impressed, neat topic.