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jconner2424(at)gmail.com
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 Posted: Thu Aug 24, 2017 1:45 pm Post subject: SDSFI redundant power wiring with Z-14 |
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Hello,
Looking for input on the following. I am installing a SDSFI system on the 540 for my RV-10 project. The power schematic for the SDSFI system is attached. I will be using a dedicated fuse buss for this engine system. http://sdsefi.com/aircraft.html
I am considering 2 different scenarios for redundant power to the system using rear mounted Odyssey P625 batteries.:
1. Running 2 - 10GA dedicated power feeds to the SDSFI engine buss with the aux feed only being switched and fused like shown in the attached schematic.
2. Running main buss power from the pass through firewall power lug that I plan to use with the 2 AWG power wire. Running 1 - 10 GA aux power feed from the rear aux battery.
Questions:
- What pros and cons do you see in the above compared scenarios?
- What benefit is the crossfeed contactor usage covering battery contactor failure at each rear mounted battery?
- Should I run the system with both aux battery contactors closed and the crossfeed contactor closed at all times?
Thanks for your input / help!
Jeff
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user9253
Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan
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| Posted: Thu Aug 24, 2017 4:08 pm Post subject: Re: SDSFI redundant power wiring with Z-14 |
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The aux battery needs to be automatically isolated during engine cranking to prevent blowing its 30 amp fuse.
There is something wrong with the ECU selector switch circuit. It appears to select both ECUs at once.
If a ground fault occurs on the master switch feeder, will the aux battery fuse blow?
Your post mentions contactors and heavy wires, but they are not shown on the schematic. A picture is worth a thousands words. I would rather see a schematic than try to understand a description.
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Joe Gores |
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