To convert electricity, you need either a transformer or a converter. Solid State type voltage converters can only be used with non-electronic heating appliances. They do not produce a normal sine wave output and will damage motorized or electronic appliances. Converters should ONLY be used with an electric appliance, for short periods of time, up to a maximum of three hours. Transformer type voltage converters can be used with any electrical appliance that meets the transformer wattage rating requirement.
Transformers produce a sine wave output that is identical to normal household electricity.
They can be used with electric AND electronic appliances. So if you have a 500 watt transformer, it can be used continuously ONLY with an appliance up to 400 watts. To determine the correct model voltage converter or heavy duty transformer you need, you must know the voltage and wattage requirements of your appliance. You can find this information listed on the appliance manufacturer's label located on the back or bottom of the appliance or in the specifications section of the appliance owner's manual. If only the amperage rating is shown, multiply the input voltage by the amperage rating to find the wattage rating.