Been reading mine for a while..
http://ecorenovator.org/forum/conser...-yourself.html
As I said above,
"It's not just accurate, it's exactly what you will be charged for.."
So, if you need to know exactly what a load is costing you,
A. You will need to know how much power it uses. (turn off everything else).
B. What your total cost per kWh is. (total bill/total kWh used).
C. How long your load is running.
If you buy a TED or other whole-house-meter, you can use
your power co. meter to determine the TED's accuracy.
Most Whole-House units can be calibrated.