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Erich_Weaver(at)URSCorp.c
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 Posted: Tue Feb 17, 2009 9:44 am Post subject: aux battery and diode alternative? |
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Bob:
My RV-7A is wired per Z-13/8 and I want to modify it to avoid EFIS brownout during starting. I have reviewed Z-35 and Z-10/8, but Z-35 adds a switch to my panel that I would like to avoid, and Z-10/8 appears to add complexity/parts count with two relays and two fuses along the alternate feed path from the battery bus to the ebus. If all I need to do is keep a single EFIS screen on during start up, cant I simplify things by just connecting the aux battery to the EFIS and keep it charged by having an additional connection from either the main bus or battery bus with a diode to prevent discharge during starting? Im probably missing something, but doesnt seem like I am gaining anything by the addition of relays.
thanks
Erich
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hotwheels
Joined: 01 Jun 2007
Posts: 240
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| Posted: Wed Feb 18, 2009 5:45 am Post subject: Re: aux battery and diode alternative? |
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One option to consider... RV10 auto sag power circuit is attached.
Fused power from the Main bus contactor activates relay whenever main bus power is present. Relay supplies power from small battery to desired devices.
Relay output drives GRT HX displays, one AHRS and an EIS (not shown for some reason). Output is protected by a fusible link.
A Schottky diode is used to charge the small battery.
The relay could be eliminated in favor of a switch but this setup doesn't require any intervention to work. If the relay were to fail the symptom would be EFIS screens "browning out" during engine start.
Cheers,
Jay
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