The Smooth Start STP-1000T DC-to-AC Power Inverter power inverters are electronic devices that convert the low voltage 12 VOLTS DC from a battery or other power source to 115 VAC to run standard household appliances. The Smooth Start feature is designed to handle the power surge that is created when some appliances are turned on. This feature helps protect both the appliance and the inverter from excessive power draws and surges. When the power switch is turned on, the STP inverter smoothly brings up the AC power. This circuitry also activates under excessive loads, even short circuits, to quickly turn off power to protect the device and the inverter. The STP inverter then attempts to smoothly bring up the AC power, unless it detects an excessive load.