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wsimpso1
Joined: 04 Nov 2018
Posts: 33
Location: Saline MI
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 Posted: Thu Apr 09, 2020 5:39 am Post subject: New Design Schemes and Brownout Operation |
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I am a pretty good mechanical engineer, but electrics, well, please bear with me as I learn.
Designing up my IFR electrics system, 2 Dynon displays and associated bits, Avidyne, LED lighting, I was all set to go Z-14. Now Bob is talking new scheme to be lighter, easier to build, maintain, and fly. I do not feel like I can really judge what is needed and not, how to pick, etc. Done the reading, just not experienced...
In the process, I have figured out that I need 30 amps continuous to turn on everything and a few more amps to transmit. Hey, there are alternators at B&C that can make Plan B just turn on the standby alternator and motor on. Cool!
Now to getting it cranked up without rebooting the electro-whizzies. Dynon makes backup batteries. Avidyne has yet to answer on how they prefer to avoid brownout reboots. Then we have brownout bus designs with relays and even have advice to use DC-DC converters to keep 12VDC at the boxes. Remember, I am an ME, my electric savvy is puny. Given the current state of knowledge, are we better off with a 7-10 AH battery and the brownout bus or with the boosters, or even both? Anybody have some brands and model numbers that are known to be pretty reliable for these DC-DC gadgets?
With the stated 10,000 hour life of these alternators, maybe I should say two on them plus the battery is enough and stop there. But let's say both are dead, and I need an hour to get to a suitable approach. I can cut off the outside lights and pitot heat, but I gotta drive one Dynon, Avidyne and transponder someway. Sounds like a good argument for a brownout battery that is an infrastructure item rather than having backup batteries for each of several boxes. Or does the FMEA score better with several independent backup batteries? Seems better to have one COTS battery, relay, and switch than a bunch of different proprietary batteries...
Billski
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user9253
Joined: 28 Mar 2008
Posts: 1931
Location: Riley TWP Michigan
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| Posted: Thu Apr 09, 2020 9:13 am Post subject: Re: New Design Schemes and Brownout Operation |
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The simpler the electrical system is, the better. It will easier to understand
and build. It will cost less and weigh less. And there will be less chance of
failure or pilot error. So add features that you need, but not those that you
might need. However, there should be a plan B for any failure.
A DC-DC converter used for brownout protection seems like a good idea.
I do not know if anyone has actually installed one yet.
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Joe Gores |
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wsimpso1
Joined: 04 Nov 2018
Posts: 33
Location: Saline MI
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| Posted: Thu Apr 09, 2020 4:08 pm Post subject: Re: New Design Schemes and Brownout Operation |
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I shall repeat my questions without the distracting associated information:
Given the current state of knowledge, do we appear to be better off with a 7-10 AH battery on a brownout bus or with the boosters, or even both?
Anybody have some brands and model numbers that are known to be reliable for these DC-DC gadgets that could be used as brownout boosters?
Which gives better reliability (scores better on FMEA) for backup power - backup batteries on the individual boxes or a single battery, switch, and relay?
Billski
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