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04-27-2016, 10:37 PM
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Join Date: Mar 2007
Location: Woodinville, WA
Posts: 533
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Quote:
Originally Posted by stamper
I went with the earthX saved 17lbs.
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My CG is so far forward, the extra weight is a benefit 
__________________
Rob Kochman
RV-10, Flying as of March 2011 ( blog)
Paine Field (KPAE)
EAA Chapter 1440
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04-28-2016, 04:56 AM
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Super Moderator
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Join Date: May 2005
Location: Locust Grove, GA
Posts: 2,627
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Charging voltage
Quote:
Originally Posted by BobTurner
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.
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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
__________________
 Vic Syracuse
Built RV-4, RV-6, 2-RV-10's, RV-7A, RV-8, Prescott Pusher, Kitfox Model II, Kitfox Speedster, Kitfox 7 Super Sport, Just Superstol, DAR, A&P/IA, EAA Tech Counselor/Flight Advisor, CFII-ASMEL/ASES
Kitplanes "Unairworthy" monthly feature
EAA Sport Aviation "Checkpoints" column
EAA Homebuilt Council Chair/member EAA BOD
Author "Pre-Buy Guide for Amateur-Built Aircraft"
www.Baselegaviation.com
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04-28-2016, 11:00 AM
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Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,797
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Quote:
Originally Posted by vic syracuse
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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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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04-29-2016, 07:14 AM
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Join Date: Sep 2009
Location: St. Louis, MO
Posts: 1,788
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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.
__________________
Bill Peyton
RV-10 - 1125 hrs
N37CP
First Flight Oct 2012
Aviation Partners, LLC
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04-29-2016, 07:34 AM
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Super Moderator
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Join Date: May 2005
Location: Locust Grove, GA
Posts: 2,627
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Quote:
Originally Posted by BobTurner
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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14.4 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
__________________
 Vic Syracuse
Built RV-4, RV-6, 2-RV-10's, RV-7A, RV-8, Prescott Pusher, Kitfox Model II, Kitfox Speedster, Kitfox 7 Super Sport, Just Superstol, DAR, A&P/IA, EAA Tech Counselor/Flight Advisor, CFII-ASMEL/ASES
Kitplanes "Unairworthy" monthly feature
EAA Sport Aviation "Checkpoints" column
EAA Homebuilt Council Chair/member EAA BOD
Author "Pre-Buy Guide for Amateur-Built Aircraft"
www.Baselegaviation.com
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04-29-2016, 09:06 AM
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Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,797
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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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05-17-2016, 12:12 AM
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Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,797
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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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05-17-2016, 05:47 AM
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Super Moderator
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Join Date: May 2005
Location: Locust Grove, GA
Posts: 2,627
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Spare wire?
Any chance you ran a spare wire to the back? If so, you can sense it right at the battery.
__________________
 Vic Syracuse
Built RV-4, RV-6, 2-RV-10's, RV-7A, RV-8, Prescott Pusher, Kitfox Model II, Kitfox Speedster, Kitfox 7 Super Sport, Just Superstol, DAR, A&P/IA, EAA Tech Counselor/Flight Advisor, CFII-ASMEL/ASES
Kitplanes "Unairworthy" monthly feature
EAA Sport Aviation "Checkpoints" column
EAA Homebuilt Council Chair/member EAA BOD
Author "Pre-Buy Guide for Amateur-Built Aircraft"
www.Baselegaviation.com
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