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  #11  
Old 04-27-2016, 10:37 PM
RV10Rob's Avatar
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Quote:
Originally Posted by stamper View Post
I went with the earthX saved 17lbs.
My CG is so far forward, the extra weight is a benefit
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  #12  
Old 04-28-2016, 04:56 AM
vic syracuse vic syracuse is offline
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Default Charging voltage

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Originally Posted by BobTurner View Post
I too use an Odyssey 925. But I put mine on its side, because Odyssey said I could, and it's a good fit to the existing tray that way (just a small additional angle to keep it from moving fore-aft).
However, I am not happy with its lifetime. Two batteries in a row seem to lose about 20% of their capacity very quickly (under even a small load, the voltage drops quickly to 12.2 volts. After that it shows a normal rate of loss). I wonder if mounting on its side is really not so good, despite what Odyssey says. It still starts fine, just not much reserve.
What do you have your alternator output voltage set at? The Odyssey's like a good 14.5 volts and if you have the typical 13.8 v output then the life of the battery will diminish as well as the reserve capacity.

Vic
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  #13  
Old 04-28-2016, 11:00 AM
BobTurner BobTurner is offline
 
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Originally Posted by vic syracuse View Post
What do you have your alternator output voltage set at? The Odyssey's like a good 14.5 volts and if you have the typical 13.8 v output then the life of the battery will diminish as well as the reserve capacity.

Vic
Thanks for the suggestion Vic. Buss voltage in flight is 14.4 volts. Think that is just a bit too low?
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  #14  
Old 04-29-2016, 07:14 AM
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Bill.Peyton Bill.Peyton is offline
 
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Bob,
My buss voltage is 14.4-14.5 and I am using a 925L for 3 years without issues. I have noticed that the resting voltage has declined slightly from the 12.8V, but never as bit of an issue.
Have you ever performed the de-sulfation process on the battery that is detailed on their website http://www.odysseybattery.com/docume..._Procedure.pdf

I have brought back several friends 680s on the field by doing this.
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  #15  
Old 04-29-2016, 07:34 AM
vic syracuse vic syracuse is offline
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Originally Posted by BobTurner View Post
Thanks for the suggestion Vic. Buss voltage in flight is 14.4 volts. Think that is just a bit too low?
14.4 should be ok, but it depends on where you ar measuring it. Put a voltmeter right on the battery and run the engine and see what you get. The rv-10 battery is quite a distance and you can get a voltage drop across that length that you may not be aware of. While you're at it, disconnect the + lead and put an ammeter in series between it and the battery and make certain you don't have a parasitic leak from something that is wired hot to the battery.

Vic
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  #16  
Old 04-29-2016, 09:06 AM
BobTurner BobTurner is offline
 
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Thanks for the suggestions.
1. I did have a parasitic load (clock keep alive) but that has been removed, thought I fixed the problem but second battery suffered the same loss-of-capacity fate.
2. Performed the deep discharge-recover technique, that seemed to work. Battery is sitting on my shelf marked 'probably okay'.
3. I have not measured voltage at the battery, engine on. Guess that is the next step.
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  #17  
Old 05-17-2016, 12:12 AM
BobTurner BobTurner is offline
 
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Vic,
You may be on to something. My D6 showed 14.4 volts on the main buss, but the GRT showed just 14.1 on the avionics buss. I ran a wire from the battery up to the cockpit and put a voltmeter on it, engine running; showed 14.1 volts.
So I guess I'll put a diode in the sense line, to pick up the alternator output, unless there's an easier way(?)
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  #18  
Old 05-17-2016, 05:47 AM
vic syracuse vic syracuse is offline
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Default Spare wire?

Any chance you ran a spare wire to the back? If so, you can sense it right at the battery.
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Kitplanes "Unairworthy" monthly feature
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