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From: Robert R Pastusek <rpastusek@htii.com>
To: Lancair Mailing List <lml@lancaironline.net>
Subject: RE: [LML] Lousy Odyssey batteries and dual bus
Thread-Topic: [LML] Lousy Odyssey batteries and dual bus
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Date: Wed, 1 May 2013 13:07:29 +0000
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Paul,
I have a similar dual system design in my IV-P. It's a very small modificat=
ion of Bob Nuckolls' design (AeroElectric Connection) to use a Schotky diod=
e bridge in place of separate bus switches to feed the avionics bus. This s=
ystem has functioned for 5+ years without any malfunction...until last mont=
h. Turned out to be a loose cannon plug at the firewall pass through, which=
 was easily fixed...after considerable effort to isolate/identify the inter=
mittent problem.=20

...but back to the thread: I have four Odessy PC 680s in 437RP (dual 28v sy=
stems) and could not be happier. Last year I changed out the #1 set of batt=
eries that I'd had since 2006--during building. Put them on my electric tow=
 where they are very happy...and still working fine. Probably time to chang=
e out the second set at this annual as they are 5 years old now,, but that =
would be precautionary...a practice I normally don't subscribe to for most =
things. Still, I recognize that when they fail, it's usually sudden and com=
plete; no "poor cranking" before as a warning.

Bob

-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Paul=
 Miller
Sent: Tuesday, April 30, 2013 7:58 PM
To: lml@lancaironline.net
Subject: [LML] Lousy Odyssey batteries and dual bus

I was on a run down to Valkaria a few weeks ago, went to start with the gro=
up to go home and the entire main bus went offline as soon as a blade turne=
d over.   No problem, went to the second buss, started, flew home.   Traced=
 one of the four Odyssey batteries (2 main buss, 2 secondary buss) had just=
 completely failed.  I was a little upset until I checked the date code of =
2008.  I got another from Amazon for $116 and everything is good to go.

I can't say enough about the dual buss design in my Legacy.  I've saved mys=
elf at least three times from having to be stuck somewhere:
1) Main alternator failure (diodes)
2) Standby alternator failure (did not require the second buss to operate)
3) main battery failure twice.

The Odyssey batteries are giving good service in the 4-6 year range but whe=
n they fail, they fail fully and without notice.

Paul
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