Check the required input wattage for the electronic device or appliance. The continuous wattage rating of the inverter will need to be the same or greater than the rating of the product you are trying to power.
PowerLine inverters are designed to power 120 volt products only. Sometimes the input rating of a product is listed as volts and amps instead of watts. To convert a rating like this to watts, simply multiply the volts times the amps. For example:
Input Voltage: 120 VAC
Input Current: 0.8 Amps (or 800 milliamps)
Multipy 120 X 0.8 = 96 Watts
In this case you would need to use an inverter rated at 96 watts continuous or greater. Many electronic devices and appliances need more power to start up than they need to run continuously. Sometimes this can cause the inverter to shut down when the device is initially turned on. If this is happening, try plugging the device into the inverter first, and then turn the inverter on (either via its switch or by plugging it into the cigarette lighter socket).