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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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