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-   -   Battery backup versus standby alternator (https://vansairforce.net/community/showthread.php?t=149176)

vic syracuse 05-03-2017 03:26 PM

Quote:

Originally Posted by DanH (Post 1170502)
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

Aggie78 05-03-2017 03:42 PM

Quote:

Originally Posted by AlexPeterson (Post 1170393)
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...

DanH 05-03-2017 05:58 PM

Quote:

Originally Posted by vic syracuse (Post 1170511)
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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