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  #1  
Old 07-19-2014, 06:26 PM
comfortcat's Avatar
comfortcat comfortcat is offline
 
Join Date: Jul 2005
Location: Southern California
Posts: 617
Default My new LiFePo battery...

I have the standard firewall mount from Van's for the PC680 but I want to use the new LiFePo Shorai LFX18L1-BS12 battery in my plane.

Many posts discuss the value of the swap, so I'll not discuss that here. Instead, I want to show how I got it to fit.

I bought a big hunk of styrofoam, and cut a piece 2 3/4 x 7 1/8 X 2 3/4 (These are approximate measurements, some trimmimg required). I placed the Shorai centered on top and drew a line around the base. Using a RotoZip tool, I cut an indentation 3/8" deep, Volia! Perfect fit and can use the same hold down.



And here is the best part! My hanger partner (who built a really nice RV-7) will make this my introductory lesson for fiberglassing! We will glass the block, and seal the foam from solvents.

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David Boeshaar
RV-9A - N18TD (reserved) - Fuselage.
"My greatest fear: What if the hokey pokey really IS what its all about?"

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  #2  
Old 07-19-2014, 07:01 PM
deene deene is offline
 
Join Date: Jan 2005
Location: Georgetown, TX
Posts: 398
Default

Suggest that you trim a little (1/32") off all surfaces and then fiberglas the surfaces of your foam block. Spacer will last much longer.
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Deene Ogden.
N399AD RV-12...flying
N299AD RV8 QB, IO-390X, BA prop...SOLD
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N99AD BD4, flew for 22 years...SOLD
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  #3  
Old 07-19-2014, 07:35 PM
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Arlen Arlen is offline
 
Join Date: Sep 2013
Location: New Smyrna Beach, FL
Posts: 305
Default

So.....in that thread that ran for about 3 years concerning LiFePo batteries, there was much discussion about charging these batteries.

I couldn't figure out if there was a consensus of opinion amongst the 247 posts in that thread.

Are these safe with our usual alternator charging systems? Can one use a trickle charger back in the hangar?

BTW, thanks for your great photos here.
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Donation to VAF 10.29.18
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  #4  
Old 07-19-2014, 08:41 PM
cubdriver cubdriver is offline
 
Join Date: Sep 2009
Location: San Diego
Posts: 144
Default Battery - Trickle Charger

My experience is that these batteries don't need a trickle charger. You can let them sit for a year and they will only lose 10% of their power.

Used one for a couple years with an O-235 with no issues.

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RV9A Owner- landed it at Osh on yellow dot
Previous Owner of 1940 J3 Cub
Currently Building RV14a
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Once you have tasted flight you will forever walk the earth with your eyes turned skywards, for there you have been and there you will long to return - Leonardo DaVinci

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  #5  
Old 07-19-2014, 11:45 PM
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comfortcat comfortcat is offline
 
Join Date: Jul 2005
Location: Southern California
Posts: 617
Default Glassing the block...

Yup! That is what the lesson will all be about. I believe the styro will withstand the heat, but a fiberglass layer will make the entire block stronger.

Thanx!

CC

Quote:
Originally Posted by deene View Post
Suggest that you trim a little (1/32") off all surfaces and then fiberglas the surfaces of your foam block. Spacer will last much longer.
__________________
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David Boeshaar
RV-9A - N18TD (reserved) - Fuselage.
"My greatest fear: What if the hokey pokey really IS what its all about?"

TDAircraft.com
-July-
--------------------------------------------------
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  #6  
Old 07-20-2014, 07:26 AM
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RV7Guy RV7Guy is offline
 
Join Date: Jan 2005
Location: Chandler, AZ
Posts: 2,940
Default Information has it....

That is a cool way to hold it. Be cautious of the foam degrading. You wouldn't want the battery to start settling.

Information has it that Shorai is going to have a drop in replacement for the 680. They will be at Oshkosh.

Regarding the charging, the charging protection circuit is in the battery. There is a balance port on the side that you use in addition to charging when not in the plane. I'm using a high end charger for my RC Lipo's and LiFe batteries to keep it charged till install.
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Darwin N. Barrie
Chandler AZ
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RV-7 N717EE-Flying (Sold)
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  #7  
Old 07-20-2014, 08:25 AM
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GalinHdz GalinHdz is offline
 
Join Date: Mar 2010
Location: KSGJ / TJBQ
Posts: 2,165
Default

GREAT idea. The next step is to make a mold, mass produce them and sell the fiberglass box as a conversion kit for this application.

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  #8  
Old 07-20-2014, 10:10 AM
F1R F1R is offline
 
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Location: ____
Posts: 861
Default

Great adapter block. Alternatively one could use a block of wood and drill it full of holes for weight reduction and air circulation.
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  #9  
Old 05-15-2015, 11:51 AM
Bevan Bevan is offline
 
Join Date: Sep 2007
Location: BC
Posts: 1,699
Default

Quote:
Originally Posted by RV7Guy View Post
Information has it that Shorai is going to have a drop in replacement for the 680. They will be at Oshkosh.
Any word if Shorai actually is intending to produce a drop in replacement for the PC680? and when?

Bevan
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  #10  
Old 05-15-2015, 01:16 PM
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RV7Guy RV7Guy is offline
 
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Location: Chandler, AZ
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Default Not now

Quote:
Originally Posted by Bevan View Post
Any word if Shorai actually is intending to produce a drop in replacement for the PC680? and when?

Bevan
Talked to them today. They said they don't have plans to do that right now. I sensed they were a little nervous about the airplane application. The Shorai LFX36-L3-BS12 is the closest in size. I did not take the time to compare the EarthX product but will be looking at them too.

Shorai L 6.55" W 3.39" H 6.10" Weight 4.96 lbs $396

Odyssey L 7.27" W 3.11" H 7.55" Weight 15.4 lbs $115-$130
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Chandler AZ
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RV-7 N717EE-Flying (Sold)
RV-7 N717AZ Flying, in paint
EMS Bell 407,
Eurocopter 350 A-Star Driver
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