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chkaharyer99(at)yahoo.com
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 Posted: Thu Aug 31, 2017 1:50 pm Post subject: Aeroelectric Figure Z-35. Non-Cranking (Small) Aux Battery |
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Greetings,
My name is Charlie and this is my first Matronics post.
I have a RV-8 with IO-360. It has a simple electrical system with one alternator and one PC-680 Battery on the firewall. My mission is daytime VFR. I am preparing to install dual electronic ignitions (Simple Digital Systems - CPI). In consideration of an alternator failure, I want each EI circuit to be independent of the other. To achieve this, I am going to add a non-cranking (small) 7 AH AGM auxiliary battery to operate one ignition. The other ignition will operate off the main battery.
In reference to Z-35, I have a few questions please.
1. Why are the wires marked with an * required to be (quote) "As short as practical. 6-inches long is ideal, 12-inches long max"?
2. In reference to the 12 AWG wire that runs from the battery contractor to the S704-1 AUX Battery Relay. What are the positives and/or negatives of placing a Schottky diode in that circuit between main battery contractor and the S704-1 AUX Battery Relay.
3. Is there a preference for which battery, Main vs Aux, powers the S704-1 AUX Battery Relay?
4. If I included a copy of my proposed wiring diagram could I get a peer review of it?
Thank you,
Charlie
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user9253
Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan
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| Posted: Thu Aug 31, 2017 5:41 pm Post subject: Re: Aeroelectric Figure Z-35. Non-Cranking (Small) Aux Batt |
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1. The * wires are not protected by fuses. The shorter they are, the less chance of them getting in trouble.
2. The main advantage of a diode is that it prevents aux battery current from flowing to unwanted locations. The disadvantage is that the aux battery will be charged at a lower voltage. But that might not be a problem since the aux battery will seldom be discharged.
3. I would energize each relay or contactor by its own respective battery. How would the aux relay be energized if the aircraft electrical system and main battery are dead?
4. It seems that Bob is reluctant to comment on proposed wiring architecture. Many have tried to improve upon his proven designs but few succeed. It will not hurt to post your wiring diagram.
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