James di Paulo wrote in a message to All:
 JdP> Does anyone know how to convert the KWH number (total used in 
 JdP> one month) from a utility bill to a number useful in estimating 
 JdP> how much solar power (PV and/or wind generator) equipment might 
 JdP> be needed to replace the same amount of electricty, or a 
 JdP> percentage of the currently used amount?
 JdP> I had a book that gave all this information but it seems to 
 JdP> have been eated by gremlins, whatever; now I need a 
 JdP> "guestimate" by this weekend, no time to re-order the book. 
 JdP> 
I'm not sure about one or two aspects of this...
KWH is kilowatt-hours,  and watts can be roughly guesstimated as volts times 
amps.  The typical line voltage is 115-120 volts, divide that number into the 
KWH figure and you'll have an AH (amp-hour) figure for the whole month.  If 
you have an idea as to how long a battery backup/storage facility would need 
to be able to go without input,  that should enable you to roughly estimate 
the capacity.
PV and wind power are often rated in watts output,  sometimes amps,  but you 
need to figure how much of the time they're going to be producing.
I hope this gives you something to start with.
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