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  #11  
Old 03-02-2023, 02:09 PM
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Lkitson Lkitson is offline
 
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Location: Harleysville, PA
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Here are some photos of how I routed the cables in my 8. Note: I had to fabricate a spacer to move the contractor outboard to line the stud up with the cable.
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Last edited by Lkitson : 03-02-2023 at 02:17 PM.
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  #12  
Old 03-02-2023, 02:15 PM
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Lkitson Lkitson is offline
 
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Quote:
Originally Posted by TimR View Post
I'm going to jump in here. I'm at the same point in my -8 QB. Where did you all mount the master and starter relays? I need to get my hands on OP10 and 11, but looking to the brain trust right now. Right now, I have the master relay mounted to the battery tray, but I've been pondering placement of the starter relay. The master relay could be moved to the firewall and then place both relays under the hood. Thoughts?
If the master contactor is on the firewall the cable from the battery to the firewall will always be hot and you won't be able to cut power to it in the event of a short. That's why I put it on the battery tray. I put the starter relay on the firewall.
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  #13  
Old 03-03-2023, 07:25 AM
TimR TimR is offline
 
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Location: mURFREESBORO, tn
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Quote:
Originally Posted by Lkitson View Post
If the master contactor is on the firewall the cable from the battery to the firewall will always be hot and you won't be able to cut power to it in the event of a short. That's why I put it on the battery tray. I put the starter relay on the firewall.
Excellent point! Thanks so much
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  #14  
Old 03-05-2023, 08:12 AM
Vbug Vbug is offline
 
Join Date: Dec 2013
Location: Hoschton, GA
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Default aft battery cable routing

Grounds to lower longerons, power wires along mid longerons(armrest level). If you use welding cable getting around the flap actuator is a non issue. I had no room to run these cables on the floor.
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  #15  
Old 03-05-2023, 08:33 AM
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Carl Froehlich Carl Froehlich is offline
 
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Rod,

No overboard vent on your batteries?

Carl
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  #16  
Old 03-05-2023, 08:40 AM
Vbug Vbug is offline
 
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I don't recall that being an option when I bought mine. When replacement time comes I will switch to vented.
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  #17  
Old 03-06-2023, 09:13 AM
vomatic vomatic is offline
 
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Carl, can you expand on your question? Does a sealed battery need to be vented (i.e. 680) or just lithium? Do you have any pics?
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  #18  
Old 03-06-2023, 09:38 AM
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Carl Froehlich Carl Froehlich is offline
 
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Quote:
Originally Posted by vomatic View Post
Carl, can you expand on your question? Does a sealed battery need to be vented (i.e. 680) or just lithium? Do you have any pics?
Just lithium. For you Earthx battery people mounting the battery(s) anywhere aft of the firewall this would be the something like the EXT-900-VNT (VNT for vent).

Nothing to stop you from using a non-vented EarthX - but watching the EarthX videos it seems they recommend it. If I ever was to use an EarthX and mounted it aft of the firewall I would only use the vented version.

For my RV-8 I mount one PC-625 battery in the the forward baggage well, the second in the normal aft location. Both are mounted using modified stock Vanís RV-8 battery trays. I did this as my W&B calculations (IO-360-M1B, Hartzell BA prop, Grove gear) worked out best this way. 370 hours on the plane and Iím very happy with the W&B.

Carl
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  #19  
Old 03-06-2023, 05:46 PM
dmn056 dmn056 is offline
 
Join Date: Aug 2014
Location: Sydney, Australia
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I'm also planning on two aft batteries, with two power cables running forward. Because of the weight, I was thinking about using aluminium wire.

Does anyone have any experience with aluminium wire in this application? I'd welcome any information or advice.

Thanks for your help
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  #20  
Old 03-07-2023, 12:37 PM
bob865 bob865 is offline
 
Join Date: Feb 2021
Location: Greenville, SC
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Quote:
Originally Posted by Carl Froehlich View Post
Just lithium. For you Earthx battery people mounting the battery(s) anywhere aft of the firewall this would be the something like the EXT-900-VNT (VNT for vent).

Nothing to stop you from using a non-vented EarthX - but watching the EarthX videos it seems they recommend it. If I ever was to use an EarthX and mounted it aft of the firewall I would only use the vented version.

For my RV-8 I mount one PC-625 battery in the the forward baggage well, the second in the normal aft location. Both are mounted using modified stock Vanís RV-8 battery trays. I did this as my W&B calculations (IO-360-M1B, Hartzell BA prop, Grove gear) worked out best this way. 370 hours on the plane and Iím very happy with the W&B.

Carl
I'm a long way from working on electrical, but I'm curious why you're running two PC-625s. Is one not enough? I assume the 625 represents cranking amps. Do you need the power from two? Is 625 amps not sufficient for starting? Are you running them in parallel so you run higher current and lower voltage or series for higher voltage and lower current?
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