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  #1  
Old 05-04-2019, 06:29 PM
rv6ejguy's Avatar
rv6ejguy rv6ejguy is offline
 
Join Date: Mar 2005
Location: Calgary, Canada
Posts: 5,129
Default Weight Reduction Program

My 6A has always been a bit heavier than I'd like so I decided since the AGM batteries were now marginal on resting voltage and passing the annual load tests, it was time to move them out and move some lithium batteries in. I also wanted to ditch the vacuum pump and 2 vacuum gyros. With annual time here, it seemed like a good time to do this work.



Vacuum pump was driven off the left camshaft.



Two Shorai 18 AH batteries will replace the PC680 main and Powersonic 18 AH backup battery.



Vacuum pump hardware out of the plane.

After weighing what's coming out and going back in, looks like I'll shed over 29 pounds total, mostly from the batteries. The 680 weighs 14 pounds, the backup, 12.2, the Shorais only 2.2 each.
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Ross Farnham, Calgary, Alberta
Turbo Subaru EJ22, SDS EFI, Marcotte M-300, IVO, RV6A C-GVZX flying from CYBW since 2003- 431.9 hrs. on the Hobbs,
RV10 95% built- Sold 2016
http://www.sdsefi.com/aircraft.html
http://sdsefi.com/cpi2.htm


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  #2  
Old 05-04-2019, 08:10 PM
Gusmax Gusmax is offline
 
Join Date: Jun 2014
Location: Sherwood Park, Alberta
Posts: 52
Default

I found the Shorai batteries on fortnine.ca site. Is that where you got them from? How did you decide on that model number, since there are so many to choose from?

Phil
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  #3  
Old 05-04-2019, 08:36 PM
rv6ejguy's Avatar
rv6ejguy rv6ejguy is offline
 
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Location: Calgary, Canada
Posts: 5,129
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Quote:
Originally Posted by Gusmax View Post
I found the Shorai batteries on fortnine.ca site. Is that where you got them from? How did you decide on that model number, since there are so many to choose from?

Phil
I bought mine from the local Shorai dealer, Sport Cycle. I searched the Shorai website first to find the AH rating and post configuration I wanted to match what I had in the plane already to make hookup as straightforward as possible.

I'll have to use some spacers to bring the front battery up to a similar level as the PC680 and some lateral spacers for the rear backup battery to keep it snug in the old box. The backup battery resides just aft of the baggage bay bulkhead. It feeds only the essential bus through a 30 amp fuse, 10 gauge wire and heavy duty toggle switch- not used for starting.
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Ross Farnham, Calgary, Alberta
Turbo Subaru EJ22, SDS EFI, Marcotte M-300, IVO, RV6A C-GVZX flying from CYBW since 2003- 431.9 hrs. on the Hobbs,
RV10 95% built- Sold 2016
http://www.sdsefi.com/aircraft.html
http://sdsefi.com/cpi2.htm



Last edited by rv6ejguy : 05-04-2019 at 08:42 PM.
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  #4  
Old 05-18-2019, 05:01 PM
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rv6ejguy rv6ejguy is offline
 
Join Date: Mar 2005
Location: Calgary, Canada
Posts: 5,129
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I finally had some time to work on the plane today and got both batteries installed.

Took a couple hours to design and build a tray to raise the battery up to the same level as the old PC680 to meet all the battery cables and have the base fit snugly against the existing captures.





I used the old hold down hardware.



The backup battery aft of the baggage bay was much easier. I just used shorter bolts for the hold down strap and took up the extra space in the tray with the special HD foam that Shorai provides with their batteries. Not so pretty but quick and functional.

Hard to get over how light these things are compared to the AGMs I removed! Will recalculate the W&B and see where I'm at.

On to the panel upgrades next and finishing the rest of the inspections for the annual.
__________________

Ross Farnham, Calgary, Alberta
Turbo Subaru EJ22, SDS EFI, Marcotte M-300, IVO, RV6A C-GVZX flying from CYBW since 2003- 431.9 hrs. on the Hobbs,
RV10 95% built- Sold 2016
http://www.sdsefi.com/aircraft.html
http://sdsefi.com/cpi2.htm


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  #5  
Old 05-18-2019, 05:10 PM
RandyAB RandyAB is offline
 
Join Date: May 2016
Location: St Albert, Alberta, Canada
Posts: 390
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Hey Ross. Is there anything other than price that steered you toward the Shorai batteries and away from brand “x”? I take it that there is no BMS system in these batteries and that is obviously not a concern for you. Do you have any insight ma to share on that matter?
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Randy P.
1st time builder
RV10 - QB wings and fuse. Working on cabin top
St. Albert, Alberta, Canada
Reserved:C-GRPY

Last edited by RandyAB : 05-18-2019 at 05:14 PM.
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  #6  
Old 05-18-2019, 07:51 PM
Northernliving Northernliving is offline
 
Join Date: May 2005
Location: Boston, MA
Posts: 148
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Any special charging consideration with the Shorai 18 AH batteries?
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Brian J.
Boston, MA
RV8 Based at ORH - Purchased
RV8 - The Dream - Under Construction
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  #7  
Old 05-18-2019, 09:57 PM
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rv6ejguy rv6ejguy is offline
 
Join Date: Mar 2005
Location: Calgary, Canada
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Quote:
Originally Posted by RandyAB View Post
Hey Ross. Is there anything other than price that steered you toward the Shorai batteries and away from brand “x”? I take it that there is no BMS system in these batteries and that is obviously not a concern for you. Do you have any insight ma to share on that matter?
There is no BMS in the Shorai batteries. Given the sensitivity of this topic here, I'd prefer not to comment further other than to say I carefully evaluated user feedback on both brands and talked to Dave Anders after he installed twin Shorais in his RV. I suggest everyone do their own research and choose which they think is best for them. Price was not a consideration in my case but these are less expensive than the other brand.

I will be installing an OV warning buzzer to compliment my current under voltage warning system. I can isolate the alternator from the primary battery and the backup is not connected to the alternator at all.
__________________

Ross Farnham, Calgary, Alberta
Turbo Subaru EJ22, SDS EFI, Marcotte M-300, IVO, RV6A C-GVZX flying from CYBW since 2003- 431.9 hrs. on the Hobbs,
RV10 95% built- Sold 2016
http://www.sdsefi.com/aircraft.html
http://sdsefi.com/cpi2.htm



Last edited by rv6ejguy : 05-18-2019 at 10:07 PM.
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  #8  
Old 05-18-2019, 10:03 PM
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rv6ejguy rv6ejguy is offline
 
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Location: Calgary, Canada
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Quote:
Originally Posted by Northernliving View Post
Any special charging consideration with the Shorai 18 AH batteries?
They do state you can charge with conventional chargers at low rates but you should also monitor voltage. Traditional alternator/ regulators are fine too but they are some cautions on charge rates and it's not a good idea to start out with a depleted battery and go flying.

I may buy a Shorai wall charger which is specifically designed for them to avoid having to monitor voltage while charging.

I'm eager to see how these turn the engine over, hopefully be doing a compression check next week and running again soon after.
__________________

Ross Farnham, Calgary, Alberta
Turbo Subaru EJ22, SDS EFI, Marcotte M-300, IVO, RV6A C-GVZX flying from CYBW since 2003- 431.9 hrs. on the Hobbs,
RV10 95% built- Sold 2016
http://www.sdsefi.com/aircraft.html
http://sdsefi.com/cpi2.htm


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  #9  
Old 05-19-2019, 09:51 AM
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FasGlas FasGlas is offline
 
Join Date: Mar 2014
Location: Prescott, AZ
Posts: 571
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I've been using 2 Deltron Lithium batteries in my Lancair for years, they have been trouble free. I keep them on a Deltron Lithium charger. They work great and weigh almost nothing.
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  #10  
Old 05-19-2019, 10:31 AM
redbaron redbaron is offline
 
Join Date: Aug 2013
Location: Lucerne,Ca
Posts: 257
Default Alt. current limit?

Make sure to have a device to disconnect the Alt. output if the alt. regulator faults and produces max output and causes thermal runaway of the battery.
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