System meters, battery capacity meters and appliance energy use meters all answer the question, "Do I have enough electricity to do what I want to do?"

One type of meter which is invaluable to homeowners who make their own electricity is the Kill A Watt Meter. This handy meter measures the power usage of individual appliances. Just plug in the appliance and read the display for kilowatt hours, time in use, power factor, frequency, watts, vol-amps, volts and amps. The Kill A Watt Meter is currently selling for less than $38.