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Lightweight rechargeable battery backup unit

 
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nuckolls.bob(at)aeroelect
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PostPosted: Mon Mar 27, 2017 2:32 pm    Post subject: Lightweight rechargeable battery backup unit Reply with quote

At 11:16 AM 3/27/2017, you wrote:
Quote:
Bob,

Hesitate to display my ignorance but with the schematic you drew won't the ASX-1 draw power from the higher voltage source, the batteries, until they are depleted to below the E-bus voltage? Won't replacing the diodes and SPST switch with a SPDT (even an on - off - on) with the center contact going to the ASX-1 solve the issue and provide the same functionality?

Tom Kuffel

Nothing ignorant about your observation my friend . . . good
eye! Your suggestion eliminates the conflict you noted.
Here's another alternative. The diodes prevent back-feeding
of either source to the opposite source. The switch
isolates the standby batteries.

Preflight would be modified to close the sb battery
switch first to see that the ASX-1 lights up. Then
turn it back off for remainder of that flight op.

Thanks for the catch!


[img]cid:7.1.0.9.0.20170327161256.0099e920(at)aeroelectric.com.0[/img]



Bob . . .


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BobD



Joined: 05 Jan 2016
Posts: 65
Location: Sheffield UK

PostPosted: Tue Jul 04, 2017 3:46 am    Post subject: Re: Lightweight rechargeable battery backup unit Reply with quote

Just as a follow up to the various posts on this and similar threads, here is the schematic of the final wiring diagram I settled on.
The switch used incorporates a warning light when the Battery Backup is activated. There are probably cheaper ones than that quoted (but I had a few spares from my old panel, so no cost to me). The Battery Holder is cheap, and fitted into a blank on my panel I had made for a potential Dynon AP at a later date.
Obviously, it does not provide a rechargeable option, but I took on board Bob's calculations that if not used in anger, the batteries should be good for 12 months, so test as part of pre-flight checklist, and replace batteries at Annual.
It is offered here with absolutely no warranty whatsoever, i.e. use at your own risk.
I have yet to have the unit approved by the UK LAA.
Thanks to all those who contributed to the thread.


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Bob Dawson
Europa XS TG || 912 ULS || G-NHRJ || Dynon Skyview || PilotAware || SmartAss3
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