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  #11  
Old 02-01-2019, 02:00 PM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 2,947
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Ed,

PM me your email address and I?ll provide details on the dual battery install. It is flying on four RVs over the last decade and has proven itself.

Carl
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  #12  
Old 02-01-2019, 02:08 PM
supik supik is offline
 
Join Date: Mar 2014
Location: Bratislava, Slovakia
Posts: 221
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Quote:
Originally Posted by Carl Froehlich View Post
Ed,

PM me your email address and I?ll provide details on the dual battery install. It is flying on four RVs over the last decade and has proven itself.

Carl
Carl,

Can you make your diagram public here for others as well?
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RV-10 in progress
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  #13  
Old 02-01-2019, 03:50 PM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 2,947
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Quote:
Originally Posted by supik View Post
Carl,

Can you make your diagram public here for others as well?
I would, but too many pages to upload.

Happy to send to anyone who PMs me their email address.

Carl
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  #14  
Old 02-01-2019, 07:49 PM
Tag Tag is offline
 
Join Date: Jul 2014
Location: Phoenix, AZ and Senoia, GA
Posts: 96
Default Dual Main Battery Sys

Hello Carl,

I?m very interested in your system. I?m still at the the ?canoe? stage, but starting to think ?bout the wiring, among other things.... Thanks

Charlie
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  #15  
Old 02-04-2019, 02:40 PM
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MarkW MarkW is offline
 
Join Date: Sep 2011
Location: Edgewater, FL. X50
Posts: 1,150
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Quote:
Originally Posted by snoop9erdog View Post
Thx Mark. Love your 9.

Have you been satisfied with the TCW battery? It senses main battery voltage and then kicks on, correct?

Do you do as the manual says....power up everything first and leave ON?
Hey Ed,
Sorry for the late reply. I like the TCW system and would do it again.
I have not checked the capacity with a load test in a while but this thread has reminded me to do that.
I wired per the manual with a toggle switch that is left on during all ops.
I also use an E-buss through a diode.
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RV9 - N14MW - Flying
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  #16  
Old 01-20-2021, 04:29 PM
snoop9erdog snoop9erdog is offline
 
Join Date: Oct 2005
Posts: 276
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Quote:
Originally Posted by Walt View Post
Having the GTN on there is interesting and presents a pretty heavy load on the TCW, when transmitting the unit may draw more than the 4 amps listed (10 amp breaker on the com side and 7.5 on the nav side) and generally uses 18ga wire to support that current flow. The feed thru CB on the TCW is shown as 10amp to carry everything?

Personally... I use the back-up battery for PFD, ADAHRS, GEA24 only.
If you really want a GTN or com on a backup I would use a separate TCW for this or larger backup source.
Walt,
Should one put the GMU 11 on the IBBS as well or would that be unnecessary?
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N646A RV9
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  #17  
Old 01-20-2021, 06:25 PM
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MacCool MacCool is offline
 
Join Date: Aug 2020
Location: central Minnesota
Posts: 529
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They shipped me a TCW IBBS 3 AH as backup with my new AFS 5400. I have elected instead to use my second Pc680 as backup in case of alternator failure. If my alternator dies...I'll just flip the second master switch and bring that backup battery online. 16 AH instead of 3 AH backup. Not sure I see a need for the IBBS.
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  #18  
Old 01-21-2021, 11:34 PM
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avrojockey avrojockey is offline
 
Join Date: Aug 2019
Location: Appleton, WI
Posts: 352
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I have the 3ah TCW IBBS, in an IFR panel I fly IFR regularly. This is what I have...

1. GDU 370
2. GDU 375
3. #1 GSU 25
4. GEA 24
5. GPS 175
6. GMC 307 (no AP servos but to control FD, draws only mA)
7. GAD 29
8. GTX 335

Total draw is calculated just under 5A, but tests show a little less as the 3ah IBBS lasted 59 min.

I went back and forth over a couple things:
1. COM...big variable draw. Decide this is an emergency I can squawk 7700 and use my backup handheld if needed.
2. GMC 307...not needed but a nice item during stressful situation, and it draws like 180mA
3. Both GDUs...there wasn't a need but I wanted the brown-out capability during start.
4. Decided against the GSU 25 #2 because of the additional load and the GPS 175 has an AHRS feeding ForeFlight if 10^-9 rears it's ugly head

I opted for the IBBS over a second battery because of weight. The IBBS is an emergency...I have and hour to get in the ground...plenty of time in the lower 48. Of course, the way my system is designed, things would need to be pretty bad to get down to just the IBBS. Alternator and battery failure, or a significant short prompting isolating both the main and endurance buses. If you use my IBBS test to gauge my healthy battery life, I would guess my battery would last about 2 hrs longer than my fuel endurance. Thats why I didn't think there was a need for another heavy battery.
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Appleton, WI
RV-9A N904DC
2019-2021 Dues Paid

Last edited by avrojockey : 01-21-2021 at 11:59 PM.
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  #19  
Old 01-22-2021, 07:07 AM
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Walt Walt is offline
 
Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 6,018
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Quote:
Originally Posted by snoop9erdog View Post
Walt,
Should one put the GMU 11 on the IBBS as well or would that be unnecessary?
Either way, the GMU11 current draw is minimal.
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Walt Aronow, DFW, TX (52F)

EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1900+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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  #20  
Old 01-22-2021, 07:25 AM
Andrew Anunson Andrew Anunson is offline
 
Join Date: Apr 2012
Location: Pound, VA
Posts: 198
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Quote:
Originally Posted by avrojockey View Post
I have the 3ah TCW IBBS, in an IFR panel I fly IFR regularly. This is what I have...

1. GDU 370
2. GDU 375
3. #1 GSU 25
4. GEA 24
5. GPS 175
6. GMC 307 (no AP servos but to control FD, draws only mA)
7. GAD 29
8. GTX 335
Not arguing against your lineup at all... just curious as to why you want to have a transponder in an emergency instead of your COM. I am currently installing my IBBS and need to make some decisions and appreciate your help. I don't want to revert to my handheld COM during an emergency. The GTX shouldn't be required if we're down to the IBBS.... does the GTX make a big difference if we need ATC help to get back on the ground?

Last edited by Andrew Anunson : 01-22-2021 at 07:32 AM.
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