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  #1  
Old 12-16-2019, 01:54 AM
jliltd's Avatar
jliltd jliltd is offline
 
Join Date: Sep 2013
Location: Rancho San Lorenzo
Posts: 1,213
Wink With pics: EarthX EXT900-VNT in aft battery location

I have been following the Earthx discussions and have a friend whom I helped install an EXT680 on his RV-8 firewall after Oshkosh 2017. It has worked great for him.

My RV-8 had the aft battery location with a Concord AGM aircraft battery. The airplane was down for a few months while Barrett Performance went through the engine. The battery didn't fare so well sitting around and had to be replaced. I opted to try one of the newer vented battery versions of the EarthX, the EXT900-VNT. I chose this vented model because of my battery location and wanted any smoke that might arise to be contained and vacate the fuselage. I added the optional EarthX vent adapter kit that takes both vent tubes and combines them into one larger tube. Included with this option is a machined vent port to send any smoke overboard.

Since the new EarthX was much smaller than the Concorde I fit new spacers around the perimeter of the EarthX. I also re-purposed a stainless steel securing band and latch from an old Artex ELT to keep the battery in place. I cross-drilled a hole in the latch for a safety pin.




I bonded two channel spacers under the stainless band with 3M tape to allow clamping down the battery within the suggested areas in the manual.




Here is another shot of the hold-down set up from the front:




Here is a photo of routing the battery vent kit to the fitting in the belly of the airplane along with a photo of the exit vent fitting from below. It was convienient to use the optional vent kit. The special plastic tubing supplied by EarthX is designed for high heat and chemicals so it does tend to want to kink of bent too far:





Here is a photo of the end result prior to re-assembling the baggage shelf:



I attached the EarthX BMS lead wire (black wire coming out of battery) to my G3X Touch system's GEA 24 LRU so that I get an alert annunciation on the GDU 460 screen if the BMS trips.
Here is a post I did two years ago describing how to do this for the G3X system:
http://www.vansairforce.com/communit...29&postcount=7

The original battery hold down plate also holds the remote transponder and traverses the rear elevator bellcrank and pitch servo.

I have been flying this now for a month and so far so good. The starter has become alive and almost gives the impression I could taxi with the starter alone.

Jim
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RV-8
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Last edited by jliltd : 12-17-2019 at 05:04 AM.
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  #2  
Old 12-16-2019, 07:52 AM
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Foghorn Foghorn is offline
 
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Location: Virginia Beach
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Jim,

Thanks for the picture tutorial. This is what I'm planning to do.

Jeff
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RV8 Fastback (Tomís Dream) - Building (N767TS)
C195 (Red Dawg) - Flying (N4469C)
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  #3  
Old 12-16-2019, 08:01 AM
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bjdecker bjdecker is offline
 
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Location: Georgetown, TX
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Jim,

It looks like you may be missing a snap bushing on the second to last bulkhead for the right rudder cable passthrough.

That battery isn't going anywhere!

B
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RV-7 (Flying)
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  #4  
Old 12-16-2019, 12:52 PM
EarthX Lithium EarthX Lithium is offline
 
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Location: Windsor, CO
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Thank you Jim for the pictorial of how you did this! You did a great job.
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Kathy
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  #5  
Old 12-16-2019, 02:10 PM
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UnPossible UnPossible is offline
 
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Location: Granbury, TX
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Dumb question.... what does the vent do for you?????
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Jason Tremble
RV-7A (Flying and Sold)
RV-10 in process (@#$$%# Cabin Top & Doors)
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  #6  
Old 12-16-2019, 02:18 PM
EarthX Lithium EarthX Lithium is offline
 
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Location: Windsor, CO
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No such thing as a dumb question. If all redundancies and safety features on your charging system fail, such as: your regulator fails, and then your over voltage protection fails, and then you do not take the alternator off line manually, any battery can go to thermal runaway and for a LiFePo4 lithium battery this means it produce a lot of smoke. As this battery is located within the cockpit, this would not be a good situation so it is "vented" overboard.
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  #7  
Old 07-24-2020, 12:27 AM
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jliltd jliltd is offline
 
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Now that EarthX has a TSO'd model of the EXT900-VNT I might put one in my Husky with same optional vent system to a belly fabric cover.
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