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04-10-2015, 08:30 AM
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Join Date: Dec 2007
Location: Flagstaff, AZ
Posts: 2,653
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For those contemplating electrical system architecture, especially if your avionics are complex, be sure to check out Vertical Power.
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Patrick Kelley - Flagstaff, AZ
RV-6A N156PK - Flying too much to paint
RV-10 14MX(reserved) - Fuselage on gear
http://www.mykitlog.com/flion/
EAA Technical Counselor #5357
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04-25-2016, 12:36 PM
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Join Date: Feb 2013
Location: Charlotte, NC
Posts: 659
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John, looking at your schematic, I see that there could be a high amp continuous load on your main bus. (Consider IFR at night, landing so pitot heat, landing lights, etc). The bus manager manual says the max continuous output on the main bus is 40 amps. Did you get any feedback from EFII on that? The essintial bus being max 30 amps is pretty easy. I also realize that actual amp draw is lower that circuit protection ratings, but not sure what the variance is.
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www.N1017H.com
Tim Huneycutt, Capt, NCANG
PC-12 Pilot
N1017H RV-10 Flying 2019
EAA #: 1106970
2020 VAF Dues Paid!
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04-25-2016, 04:26 PM
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Join Date: Dec 2005
Posts: 155
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Stephen
I have a diagram for an E-bus system I designed for my plane and which is also installed on a friends Rocket. It is a reliable and simple system for one alternator and two batteries. No electronics, three busses (main, avionics and essential), one diode and two switches.
Send me an E-mail address and I will send a copy of the Rocket diagram
George, RV8, 1475 hours
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05-28-2017, 06:47 AM
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Join Date: May 2017
Location: Denver CO
Posts: 151
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Old thread but still good info.
George- can you send me the file for the ticket? Tried to send a PM but says yours is full.
Thanks
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05-28-2017, 08:26 AM
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Join Date: Aug 2007
Location: Granbury, TX
Posts: 103
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Electrical System Architecture
My system is very similar to Mike Starkey's, except I use a bus tie solenoid as specified in Nuckoll's book. There are many ways to design your system and I doubt that any 2 are alike.
The important question to ask yourself is do you plan to use electronic ignition? If so, will it require external power? If the answer is yes to both, then you will need some redundancy, particularly if you run with 2 EI systems. Two batteries and two alternators is the gold standard.
I have a G3X and GTN and they will crash if on the same bus as your starter. It won't hurt them, but your engine will run for a minute with no engine monitor as the G3X reboots. There are other products out there to temporarily hold up the voltage on the avionics during cranking if you don't want to go with two batteries.
The Dynon D-6 has an internal battery that will keep it humming even in the event of a total electrical failure of both busses. Great redundancy there.
The important concept to learn is FMEA: failure modes and effects analysis. This will find the weak point in your design (every design has a weak point) and determine if it is acceptable for your flying profile, and resale.
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Dave Moore
Granbury, TX
RV-10 and Breezy
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05-28-2017, 04:55 PM
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Join Date: Jan 2016
Location: Sugar Land, TX
Posts: 406
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To help keep the G3X from dropping out during start you should make use of the GAD 27 low voltage protection voltage stabilizer system. A TCW battery tied to the master bus will also provide power to keep the systems up during start, and these batteries are relatively low cost.
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Dave Macdonald
RV-10 First Flight April 1, 2020.  Currently in Phase 1
2020 VAF Dues Paid
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