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Date: Wed, 26 Dec 2007 17:58:28 -0500
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From: "Douglas Brunner" <douglasbrunner@earthlink.net>
References: <list-2612526@logan.com>
Subject: Re: [LML] Batteries - 2 x 12 = 24
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In my Legacy, I have a dual battery, dual alternator setup using 4 x 12 volt 
batteries.  I used 4 Odyssey batteries and wired each pair in series.  My 
electrical system also has a separate 12V bus for accessories that need 12V.

De-Ice is currently being installed by RDD.  On a Legacy, the second 
alternator goes on the front of the engine, not on the back.

We are waiting for Kelly to develop the regulator that allows the de-ice 
alternator to step down from 70 volts to 24 volts and feed the 2nd bus.  In 
the meantime, I am operating the plane on a single alternator - cross tied. 
I am told that Kelly will have the regulator "soon".  If not, I can put a 
second alternator on the back of the engine.

Doug

----- Original Message ----- 
From: "Thomas O'Grady" <ogrady@gci.net>
To: <lml@lancaironline.net>
Sent: Monday, December 24, 2007 11:45 PM
Subject: [LML] Batteries - 2 x 12 = 24


>I have a 24v system with one battery.  I have decided to install the  RDD 
>(Kelly Aerospace) anti-ice system, which puts a second alternator  at the 
>right rear of the engine, where the battery is now.  I was  looking at 
>using 2 each 12 volt batteries, probably Odyssey 625's,  rather than a 
>single 24 volt.  It looks like they will be easier to  fit in the cockpit. 
>It also seems that this would let me use 12v  accessories, as long as they 
>did not draw much, like a CD player, or  if they were balanced on two 
>sides, like a set of seat heaters.  You  could, in a pinch, unhook both 
>batteries, and put them on a standard  charger individually.  Finally, if 
>one cell goes bad, you can replace  one unit.  Any thoughts?
>
> Tom O'Grady
> N241DM
> LIVP
>
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