My Reply follows quote. On 30/07/2003 06:20 [EMAIL PROTECTED] 
said:  

>I have 2 SE-30's.  I would like to use these with a PASCO interface box to
>collect field data for my chemistry classes.  I will be using Science
>Workshop 2.3.3 on the SE-30's.  I would like to run the computer's from a
>deep cycle marine battery connected to a DC to AC power inverter.  Will this
>work?  Anyone have any idea how long the battery will last?  I could use
>some input.
------------
How many amp/hours in the battery?

How many watts does the SE/30 use?

How efficient is the inverter?

Plug in the conversion factors, make a couple of assumptions about 
efficinecy, turn the crank on the calculator.

Ken

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