Some readers of this echo may be interested in knowing how to use
the power company's KWH meter to determine power draw at a  
particular time.
 
The information needed to do this is marked on the meter nameplate.
Look for the value listed for "Kh".  "Kh" is the number of watt-hours
per revolution of the aluminum rotor disk.
 
Here's the formula:  watts = (#rev.'s X 3600 X Kh)/ (sec.s) 
 
For example:  If "Kh" on the meter is  7.2 and it takes 40 seconds
for the meter disk to revolve 10 times, then...
watts = (10 X 3600 X 7.2)/ 40 = 6480 or 6.4KW
 
This rate of use or 'demand' is handy to know for various purposes.
In particular, one might wish to know the highest value of demand in
order to size a back-up generator or a battery bank/inverter system.
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