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  #21  
Old 05-03-2017, 03:26 PM
vic syracuse vic syracuse is offline
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Quote:
Originally Posted by DanH View Post
Vic, got a link? Found these two (both appear to be voltage monitoring)...

http://lightspeed-aero.com/Manuals/PS_Diagram.htm

http://lightspeed-aero.com/Images/du...ator-LSEr4.pdf

...but nothing to test battery capacity.

Re voltage monitoring, these are less than $5 delivered, and can be configured to alarm:

http://www.vansairforce.com/communit...&postcount=166
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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  #22  
Old 05-03-2017, 03:42 PM
Aggie78 Aggie78 is offline
 
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Quote:
Originally Posted by AlexPeterson View Post
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.

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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  #23  
Old 05-03-2017, 05:58 PM
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DanH DanH is offline
 
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Quote:
Originally Posted by vic syracuse View Post
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.
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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