Online Only! Free Delivery on Generac Standby Generators Sold by Sears!24/7 power protection for your home or business from unexpected power outages with the prepackaged Guardian® Guardian® Series 8 kW automatic standby generator and transfer switch. When your electricity is interrupted, the generator detects the problem and goes to work. The automatic transfer switch safely disconnects the utility line and transfers to generator power. Power is simultaneously restored within seconds. Once the utility is restored, the generator returns to standby mode. The system works whether you are home or away, runs on your home’s existing LP or natural gas supply, and sits outside just like a central air conditioner.