This is an non-invasive Energy Monitor with a SCT-013-030 Sensor. I mesure the energy consumption of a room dryer that consumes about 1400W. In low energy it doesn't give accurate results, that's why I set all mesurements up to 60W to 0W. Mabe a SCT-013-005 gives better mesurements for low currents. I started to play with arduino last november and this is my second mysensor project. Fritzling file is shared http://fritzing.org/projects/sct-013-030-energy-meter