A real world example.  A new Sears diehard 650 CCA aux battery will last 4
hours until completely dead running the 8 AMP fridge.  On 12 V the fridge
runs continously pulling 8 amps.  So assume 50% depletion in 2 hours = 16
Amps available.

>From: Loren Busch <starwagen@GMAIL.COM>
>Reply-To: Loren Busch <starwagen@GMAIL.COM>
>To: vanagon@GERRY.VANAGON.COM
>Subject: Understanding Amp Hours
>Date: Tue, 20 Jun 2006 08:43:35 -0700
>
>The answer to another question here on the list raised this question.
>Given
>that we have the amp hour rating for a battery and also given that we don't
>want to draw it down below about 10.5 volts, about 80%.  Does that amp hour
>rating assume draw down to the 80% level, or draw down to 'dead', zero?
>I've always assumed that if I have a 50 amp hour battery that I can draw 1
>amp for 50 hours before reaching the point that will require charging, or
>will I only get 20% of that, 1 amp for 10 hours, before reaching the point
>where I need to recharge?