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05-03-2017, 03:26 PM
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Super Moderator
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Join Date: May 2005
Location: Locust Grove, GA
Posts: 2,626
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Quote:
Originally Posted by DanH
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Look at the dual power supply wiring diagram. By pulling the 10 amp breaker and putting the B ignition to the aux source, and watching the voltmeter, you should be able to test the aux battery. You could even run it in flight that way every once in a while.
Vic
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 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
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Author "Pre-Buy Guide for Amateur-Built Aircraft"
www.Baselegaviation.com
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05-03-2017, 03:42 PM
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Join Date: May 2014
Location: Fort Worth, Texas
Posts: 436
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Quote:
Originally Posted by AlexPeterson
Good point - I do check the voltage of this battery prior to startup before every flight. I also full time monitor its voltage during flight to be sure the proper charging voltage is being applied. The test I do annually is a capacity check, where I run it down to perhaps 10 volts, to determine amp-hr capacity.
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Here's a method of very accurately determining battery capacity I used in when I was heavy into glider flying:
http://aviation.derosaweb.net/batter...ingFeb2012.pdf
I flew with 2 identical SLA batteries, and this load test was a great way of discovering one that was starting to decline.
Very important in a glider (with all the electronic gizmos nowadays) that doesn't have a non-electric variometer...
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Rob Schroer
RV-7/N75WV
YIO-360-M1B
New Braunfels, Texas (KBAZ)
VAF Monthly Donor
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05-03-2017, 05:58 PM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Quote:
Originally Posted by vic syracuse
Look at the dual power supply wiring diagram. By pulling the 10 amp breaker and putting the B ignition to the aux source, and watching the voltmeter, you should be able to test the aux battery. You could even run it in flight that way every once in a while.
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Ah, voltage monitoring over an extended time. That works. I was hoping he had some sort of interesting capacity test circuit....sorta like a standard automotive resistance load tester, or the test rig in the article Rob linked.
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Dan Horton
RV-8 SS
Barrett IO-390
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