foghorn757(at)gmail.com
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 Posted: Thu Apr 09, 2020 8:11 am Post subject: New Design Schemes and Brownout Operation |
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Bill,
Here is my electrical plan. I have SDS EFI, GRT Sport EX x 2, GPS175, EIS and GTR-200 x 2. The SDS EFI runs from the ENG BUS. The GRTs get primary power from the VP-X and secondary power from the E-BUS. The #2 GTR-200, GPS175, EIS, Stratus, GMA240, encoder and ARINC get power from the E-BUS. The number one priority is to keep the ENG BUS and E-BUS alive for continued emergency flight IFR.
Jeff Parker
| Quote: | On 9Apr, 2020, at 09:39, wsimpso1 <wsimpso1(at)comcast.net (wsimpso1(at)comcast.net)> wrote:
--> AeroElectric-List message posted by: "wsimpso1" <wsimpso1(at)comcast.net (wsimpso1(at)comcast.net)>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 the I gotta drive one Dynon, the Avidyne and the 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 independant backup batteries? Seems better to have one COTS battery, relay, and switch than a bunch of propitiatory batteries...BillskiRead this topic online here:http://forums.matronics.com/viewtopic.php?p=495724#495724
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SINGLE_FWD_BATT_SDS_Rev5.pdf |
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