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Z19RB Engine Battery Buss Question

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ZuluZephyr

Joined: 12 Mar 2008
Posts: 6
Location: Upland CA

Posted: Fri Dec 04, 2009 12:10 am Post subject: Z19RB Engine Battery Buss Question

I am building a Sportsman with 2 batteries in the back behind a bulkhead (about a 10 to 12 foot run to the firewall).



Z19 call for the always hot Engine Battery Buss (fuse block) to be within 6 inches of the battery.  This would mean bringing about 10 hot wires forward to the panel from the buss.



What would be the downside of mounting the Engine Battery Buss (and Main Battery Buss) near the panel and resizing the 2 hot wires from the battery to the buss and adding an ANL fuse to protect the wire other than the addition of the fuse? This would reduce the wire count for this run length.



Thanks,



Rocky

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nuckolls.bob(at)aeroelect
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Posted: Fri Dec 04, 2009 5:39 am Post subject: Z19RB Engine Battery Buss Question

At 02:10 AM 12/4/2009, you wrote:

 	  Quote: 	
		  



I am building a Sportsman with 2 batteries in the back behind a 

bulkhead (about a 10 to 12 foot run to the firewall).



Z19 call for the always hot Engine Battery Buss (fuse block) to be 

within 6 inches of the battery.  This would mean bringing about 10 

hot wires forward to the panel from the buss.


	


    That's a lot of items for a hot battery bus.

    What systems make up the 10 loads and what

    are their current requirements?

 	  Quote: 	
		  What would be the downside of mounting the Engine Battery Buss (and 

Main Battery Buss) near the panel and resizing the 2 hot wires from 

the battery to the buss and adding an ANL fuse to protect the wire 

other than the addition of the fuse? This would reduce the wire 

count for this run length.


	


    It's a crash-safety thing. We'd like for wires

    that are always hot to be breakered at 5A or

    less, fused at 7A or less. A battery buss feeder

    to a remotely mounted battery would not fit

    the design goals for contemporary TC aircraft.

        Bob . . .

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ZuluZephyr

Joined: 12 Mar 2008
Posts: 6
Location: Upland CA

Posted: Fri Dec 04, 2009 10:12 am Post subject: Re: Z19RB Engine Battery Buss Question

The Engine and Main buss are basically duplicates with the following:



1. EFI   4a

2. ECU 1a

3. Pri Fuel Pump 7.5a

4. Sec Fuel Pump 7.5a  (only one running except take off and landing)

5. Electric Constant Speed Prop 4.5a  (9a peak)



Thanks,



Rocky

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nuckolls.bob(at)aeroelect
Guest

Posted: Sat Dec 05, 2009 7:12 pm Post subject: Z19RB Engine Battery Buss Question

At 12:12 PM 12/4/2009, you wrote:

 	  Quote: 	
		  



The Engine and Main buss are basically duplicates with the following:



1. EFI   4a

2. ECU 1a

3. Pri Fuel Pump 7.5a

4. Sec Fuel Pump 7.5a  (only one running except take off and landing)

5. Electric Constant Speed Prop 4.5a  (9a peak)


	


   Hmmm . . . Sounds like you're splitting engine electrical

   source duties between on battery bus and the main bus. I

   presume you're combining the dual path sources with

   a diode-pair.



   The battery bus really needs to be close to the battery

   if you subscribe to the notion of minimizing the length

   and fusing of always hot-wires. If you want to extend

   a bus feeder to some more forward location, conventional

   wisdom calls for a "mini-contactor" or power relay like

   that suggested in Z-32 for a "heavy-duty e-bus".



   I think I'd leave the relay out and run the long wires

   to small fuses.



   Bob . . .

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ZuluZephyr

Joined: 12 Mar 2008
Posts: 6
Location: Upland CA

Posted: Mon Dec 07, 2009 7:22 pm Post subject: Re: Z19RB Engine Battery Buss Question

Hi Bob,



You are correct, I am planning on using diodes.  I have not looked at Z32 but I believe long wires and small fuses make sense.



Thanks,



Rocky

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