I don't think I've ever seen a "automatic" transfer switch for a portable set up. With portable generators you always have to manually transfer the power to the generator. One reason for that would be a situation like, the power goes off and the transfer switches to generator, you remotely start the generator and hook ups are already in place, as that generator cranks over to start the power out put would be very low as the engine turns to start, if it doesn't start, then your getting low volts going to your entire house panel. As a generator starts up, you'd have 25 volts, 50 volts, 80 volts then 120 or so, same as if it were to run out of gas and shut off, the slowing of the engine would have your volts decrease from 120 to 0 until the engine stopped turning. That could possible cause some damage to your appliances that like a steady flow of volts, like refrigerators, computers and some TVs. My friend has a portable, that is outside his house, and all the wires are wired up all the time, his power goes off, he pushes the remote key fob and starts the generator, then has to go down to the basement and manually flip the switches to transfer to generator power. He don't have to leave the house, until the generator needs refueled, and if he's not paying attention and it runs out of fuel, his TV will flicker until he engine stops running.