I would like to have a data logger that can track the KWs being used in my
home. I need to know load times/days etc. I have seen a number of items that
do this by attaching to the power cable from the consumer unit and then
sending this data using RF to a display unit.
(http://www.electrisave.co.uk/) but this does not have a PC interface so I
cannot use it to log data over a long period of time.
Question: How does this device collect/measure the total electricity used?