Is there a device to measure electrical usage over a span of about a day, and plot a graph of power use versus time? If it can transfer logged data to a computer that would be even better.
I want to measure the power consumption of appliances like refrigerator, dehumidifiers, air con, and get an idea of their duty cycle. These appliances cycle between high and low power, so something like a "kill-a-watt", which I already have, can't give me an overall picture of power consumption.