The input voltage range for the AR series is anywhere from 75 to 130 volts. The output voltage is 110 volts. For a 220-volt output, the input voltage can be anywhere from 180 to 260 volts.
The output voltages are regulated to plus 4 percent, which the drift can be up to 4 percent of the stated output. For a 110-volt output, 4 percent of 110 is 4.4 volts. Adding 4.4 to 110 yields 114.4 volts, which is the maximum the voltage will rise. For 220 volts, 4 percent of 220 yields 8.8 volts. Adding the two yields a maximum output of 228.8 volts, which is still within the acceptable voltage range of most equipment.
The AR- 350 is rated at 350 watts of power, the maximum power draw the appliance can have. You find the power draw by looking at the manufacturer's tag, usually on the back of the appliance. If your appliance requires more power, this regulator is too small. You will have to use the AR-500 or larger, which can provide 500 watts of power or more. Goldsource Electric manufactures regulators that provide up to 5,000 watts of power. Add up the power requirements of your appliances, and size up a regulator accordingly.