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  #21  
Old 12-07-2021, 01:25 PM
rv8ch's Avatar
rv8ch rv8ch is offline
 
Join Date: Feb 2005
Location: LSGY
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Quote:
Originally Posted by smithflys23 View Post
What is the consensus on using the vented, or standard EarthX battery on an RV8 with the rear mounted battery?
I have the ETX680c on the firewall - saves a lot of weight to not have those fat cables going all the way to the rear. And of course the battery is very light.

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http://www.rv8.ch/battery-holder/

If for some reason it decides to start smoking, it's outside the cabin, and on the other side of the FW from the fuel lines and pump. It will be a bad day for sure, but hopefully not my last day.
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  #22  
Old 12-07-2021, 01:31 PM
Freemasm Freemasm is offline
 
Join Date: Nov 2017
Location: Orlando
Posts: 666
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Quote:
Originally Posted by airguy View Post
Depends entirely on your level of risk aversion. Thermal runaway can occur with a lithium battery if they are overcharged - so if you are absolutely 100% certain that you will notice and stop an overcharge event if your alternator regulator goes Tango Uniform, then you may choose to do without the vent.

I have a full glass panel with no less than 4 individual devices that will alarm on high or low voltage - so I'm relatively sure I'll notice it and correct it - and I still put my ETX900 (behind the baggage compartment) in a sealed case and vented it through the belly. YMMV.
I believe your configuration is safe; however, thermal runaways can occur for reasons other that OV. Internal shorts (related/unrelated to manufacturing quality issues), mechanical damage, over temp, etc. I'd never consider a Li-Fe-xx application without proper venting.
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  #23  
Old 12-07-2021, 03:09 PM
smithflys23 smithflys23 is offline
 
Join Date: Feb 2017
Location: Jupiter
Posts: 286
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Quote:
Originally Posted by rv8ch View Post
I have the ETX680c on the firewall - saves a lot of weight to not have those fat cables going all the way to the rear. And of course the battery is very light.

Attachment 19276

http://www.rv8.ch/battery-holder/

If for some reason it decides to start smoking, it's outside the cabin, and on the other side of the FW from the fuel lines and pump. It will be a bad day for sure, but hopefully not my last day.
Ideally, i would put it on the firewall. However, with the inverted oil system, there isnít a lot of real estate left.
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  #24  
Old 12-31-2021, 09:48 PM
Dave H. Dave H. is offline
 
Join Date: Apr 2013
Location: Oceanside
Posts: 45
Default Fit in Vans PC680 steel battery box?

Quote:
Originally Posted by 219PB View Post
The internals of the 680 and 680C are the same. The 680's case is a little larger so that it would be drop in replacement for the Odyssey 680 battery box. I installed dual 680Cs to take advantage of the smaller box. They turn over my 360 very well.

I have a 60 amp alternator on one of the batteries and a 30 amp on the other. It will take about 5 mins for the 30 amp alternator to charge the battery if I have had the avionics on doing updates, troubleshooting, etc. If not, I do not even notice a significant current draw, even after starting the engine.
Can you confirm the EarthX fits in Vansí 680 steel battery box?
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  #25  
Old 01-01-2022, 03:39 AM
SteveHicks SteveHicks is offline
 
Join Date: Sep 2017
Location: Shropshire, UK
Posts: 32
Default Fit in Vans PC680 steel battery box?

Dave ... you may be talking about a different battery box, but the box supplied for the RV14 is designed to fit an Odyssey PC680. The EarthX ETX680/900 is 0.1″ deeper, and just over 0.5″ shorter in width. Height about the same.

The depth issue means that the ETX900 sits on the battery box lower lip, rather than on the box bottom.

I used packing pieces/strap/spacers to fit my EarthX into the kit battery box ... see here for more info.
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Last edited by SteveHicks : 01-01-2022 at 03:42 AM. Reason: Realised may be referring to a different bat box
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  #26  
Old 01-01-2022, 03:40 AM
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jliltd jliltd is offline
 
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Quote:
Originally Posted by rv6n6r View Post
I've been wondering how people vent these. Can you describe it? Pictures?
Here you go. Vented EarthX in an RV-8:

https://vansairforce.net/community/s...d.php?t=177796
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  #27  
Old 01-01-2022, 07:02 AM
219PB 219PB is offline
 
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Location: Victoria, Tx
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Quote:
Originally Posted by Dave H. View Post
Can you confirm the EarthX fits in Vansí 680 steel battery box?
I cannot. I did not have the steel box with my 6A kit.
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  #28  
Old 01-01-2022, 09:23 AM
calpilot calpilot is offline
 
Join Date: Aug 2018
Location: Independence
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VFR - maybe, IFR, no! contact me directly and I can discuss what I have observed in the field. Then make your own decision.
G.
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  #29  
Old 01-01-2022, 04:30 PM
spark68 spark68 is offline
 
Join Date: Apr 2013
Location: Lk Havasu City, AZ
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Quote:
Originally Posted by Dave H. View Post
Can you confirm the EarthX fits in Vansí 680 steel battery box?
I'll tell you what the EarthX rep told me at Airventure 2021. It will not fit, a little to thick (?). I haven't tried one myself to confirm.
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  #30  
Old 01-01-2022, 05:24 PM
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scrollF4 scrollF4 is offline
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Join Date: Jan 2010
Location: Flower Mound, TX
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Quote:
Originally Posted by Dave H. View Post
Can you confirm the EarthX fits in Vansí 680 steel battery box?
As mentioned, the ETX680 is just a tad too thick. However, I mounted first ETX in the Van's box by adding left and right side spacers between the box and the firewall. I fab'd match-drilled lengths of 1/2" by 0.125" aluminum bar from Home Depot Aviation Supply. I used padding on the left and right sides to be sure it stayed in place. Piece of cake.

I eventually bought EarthX's stainless battery box for the ETX680. It just does a better job holding the battery in place while also protecting it from heat.
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