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  #1  
Old 05-28-2017, 02:40 PM
sritchie sritchie is offline
 
Join Date: Jun 2015
Location: Boulder, CO
Posts: 130
Default dual battery location for RV10?

Hey folks,

I'm currently planning out my firewall and battery locations and trying to decide where to mount my dual EarthX ETX900 batteries. Couple of options:

1. try and fit both on the firewall. (I know folks will be concerned about temps here.)
2. mount both on a dual tray system like Bob Condrey's done here:



3. mount one on the firewall (primary) and one in the back (backup) in the stock location. I'd do the primary up front because the wire run is shorter.

Is there any reason I should do #3? I'm leaning toward #2 or #3, since it's a pain to find spots for two batteries on the firewall, assuming that #3 isn't totally unreasonable.

Would love to hear your thoughts!
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  #2  
Old 05-28-2017, 02:59 PM
bcondrey bcondrey is offline
 
Join Date: Jan 2005
Location: Bellevue, NE
Posts: 513
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I actually changed that after the first year to move CG forward. Put a PC-680 on the firewall and a 925 in back, worked well and several others have since done the same.

On an RV-10 you can always add some weight in the baggage area to shift CG aft, but not really anything you can do (from a loading perspective) to move it forward from empty. Ideal situation is to have the empty CG near the forward limit.
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  #3  
Old 05-28-2017, 03:05 PM
sritchie sritchie is offline
 
Join Date: Jun 2015
Location: Boulder, CO
Posts: 130
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that's really good to know. Any reason you didn't move both batteries forward vs having one forward and one back?
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  #4  
Old 05-28-2017, 03:11 PM
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Carl Froehlich Carl Froehlich is offline
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 2,073
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Sam,

Send me a PM with your email and I'll provide photos of my dual PC-625 install and power distribution design.

Carl
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  #5  
Old 05-28-2017, 03:17 PM
sritchie sritchie is offline
 
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Location: Boulder, CO
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PM sent! Thank you sir.
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  #6  
Old 05-28-2017, 04:28 PM
bcondrey bcondrey is offline
 
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Location: Bellevue, NE
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The reason I kept one back and moved one forward was all about CG
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  #7  
Old 05-29-2017, 03:33 PM
Nukeflyboy Nukeflyboy is offline
 
Join Date: Aug 2007
Location: Granbury, TX
Posts: 96
Default Dual battery for RV10

Put them both behind the baggage compartment in the tray. I did not have enough room side-by-side so I stacked them, one above the other. They can be mounted in any orientation. I have an Oddessy 925 and a 680 with the 680 on its side on top.

The 10 really needs the weight aft. Even with 2 batteries there I carry 40 lbs of sand in the baggage compartment when there are just 2 on board.
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  #8  
Old 05-29-2017, 03:46 PM
BobTurner BobTurner is offline
 
Join Date: Dec 2011
Location: Livermore, CA
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Quote:
Originally Posted by Nukeflyboy View Post
The 10 really needs the weight aft. Even with 2 batteries there I carry 40 lbs of sand in the baggage compartment when there are just 2 on board.
Most 10's I've seen are already a bit tail heavy. Where's your empty cg? Do you have a heavier-than-normal prop, or ac up front?
BTW, I recommend water in plastic containers instead of sand, for ballast. If you fly solo somewhere to pick up passengers, it's easy to just pour out on the ground. And vice versa, most airports have water available.
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  #9  
Old 05-29-2017, 05:55 PM
Nukeflyboy Nukeflyboy is offline
 
Join Date: Aug 2007
Location: Granbury, TX
Posts: 96
Default Dual battery location for RV10

My empty CG is 107.82 with design range of 107.84 to 116.24.
Front seat passengers and fuel sit close to the CG making most RV10's nose heavy, not tail heavy. If you put back seat passengers and baggage the CG moves appropriately aft.

My a/c is stock with a 2-blade Hartzell.

With only front seat passengers and no ballast there is not enough trim authority to flare and land, hence the weight needed in the baggage compartment.
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  #10  
Old 05-29-2017, 08:14 PM
sjhurlbut sjhurlbut is offline
 
Join Date: Jan 2005
Posts: 643
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You live in Colorado so one thing I would consider is preheating the engine compartment. I live in Canada so battery in engine compartment is preferred because when you preheat engine for winter ops the batteries get some residual heat as well.

Very curious about the forward CofG on mentioned RV10. So far I've heard everything opposite which is another reason I'm going battery on firewall.
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