REFLECTOR:Odyssey Battery

[Ronnie Brown]

On the other hand, I am using a plain old Advance Auto group 34 battery, 72
month (about $60 as I recall).  It has been in service for over a year. I am
doing my annual condition inspection this week and ran a load test with
everything on except lights. This includes a Garmin 430, Garmin 320
transponder, Navaid, Microair 760, PM4000 audio/intercom, Micro Encoder,
electric turn coordinator gyro, avionics fan, and GRT EIS engine monitor.

Battery voltage started at 12.0 volts and decayed to 11.8 volts after 3
hours.  I then switched to the normal power source which runs through a
power diode (prevents back feeding the main bus from the essential bus) and
drops the essential bus voltage to 11.0 volts.  Everything including the
Garmin 430 continued to function normally.

Good information!  I had a alternator field connector break on the way to
Florida a couple of weeks ago.  I cycled the GPS on every 15 minutes to
confirm my position and flew for 2 hours after the failure.  Now I know my
big ole car battery will run everything well over 3 hours and still have
enough juice to extend the gear.

Ronnie Brown


----- Original Message -----
From: "Jack Sheehan" <j.f.sheehan@larc.nasa.gov>
To: <reflector@tvbf.org>
Sent: Monday, February 02, 2004 2:21 PM
Subject: Re: REFLECTOR:Odyssey Battery


| John.
| Hard to say since my old battery was about 2 years old when it first
| flew. The voltage drop is really not that significant since it would
| just get below about 12.9 volts for just a second or two. The new
| battery was from sears they sell for about $120. It is an SLA battery
| as was being described earlier. The battery has about 920 CCA as
| compared to my old one which was about 680 CCA The spec sheet shows
| it being able to sustain a 25 amp load for 90 minutes down to 10.5
| volts. Since I have a fairly heavy load on my instrument panel I
| wanted a bigger battery. I think the heaviest load items normally on
| in my airplane are the strobe and landing lights.
|
| Jack
| N55XL
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