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Paul,
I have a similar dual system design in my IV-P. It's a very small modification of Bob Nuckolls' design (AeroElectric Connection) to use a Schotky diode bridge in place of separate bus switches to feed the avionics bus. This system has functioned for 5+ years without any malfunction...until last month. Turned out to be a loose cannon plug at the firewall pass through, which was easily fixed...after considerable effort to isolate/identify the intermittent problem.
...but back to the thread: I have four Odessy PC 680s in 437RP (dual 28v systems) and could not be happier. Last year I changed out the #1 set of batteries 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 change 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 complete; 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 group to go home and the entire main bus went offline as soon as a blade turned 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 myself 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 when they fail, they fail fully and without notice.
Paul
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