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Old 01-14-2018, 05:39 PM   #11
PapuaPilot
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Default Re: Garmin Panel - trying to figure out all the details

Definitely lots of opinions, but you need to decide what is right for your flying. I would suggest the G5 too as a backup in lieu of a second 10" screen for the reasons already mentioned. Did anyone say it can drive the autopilot too.

Battery: You need at least one other battery other than the big main one. The #1 reason is to keep the G3X system/screen alive during starting; the screen will go blank and reboot if the voltage drops below ~10 volts. I originally had a second 5AH lead acid battery for this purpose (4.5 lbs with wiring). Last year I upgraded to a home made Lithium battery setup with a charger/balancer circuit board (the whole thing is under 1 lb.). This battery also powers my electronic ignition during the start when the main battery voltage goes low.

The other possible need for a second battery is to keep essential systems (G3X screen/sensors, ignition, lights, COM?, transponder?, trim?, etc.) alive if the main power source quits or dies. Again, you should read Bob Knuckles-Aero Electric information. You get to decide what is essential for your plane and type of flying. I designed my system (a single 10" screen G3X) so that I can keep going on the main battery for 2.5 - 3 hours if the alternator dies. I have a backup feed directly from the battery to the essential bus through an "emergency" switch. My main battery is an Odyssey 680 (~16 AH).

My independent backup is an iPad using the Garmin Pilot app. This gives me everything I need to get safely on the ground day/night VFR. The only thing I wouldn't have is engine instruments, but I feel the only critical one after starting would be oil pressure, and the chance of loosing that is about zero.
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Old 04-09-2018, 11:33 AM   #12
wannafly
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Default Re: Garmin Panel - trying to figure out all the details

That list is very much what Iím thinking of doing as well. Will you be making your own wire harnesses? Is the extra cost to order them worth it? Wiring scares me and not interested in frying any instruments. Where are you at?
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Old 04-09-2018, 01:15 PM   #13
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Default Re: Garmin Panel - trying to figure out all the details

Quote:
Originally Posted by wannafly View Post
That list is very much what Iím thinking of doing as well. Will you be making your own wire harnesses? Is the extra cost to order them worth it? Wiring scares me and not interested in frying any instruments. Where are you at?
I'm in the same boat for a GTX327 harness. I can buy the components for $60 USD and spend 3 hours making it OK, or I can buy one on ebay made by a pro for $300. It is a big price difference....The wiring should be pretty simple but piece of mind is worth something. It is the last wiring I have to do besides my antenna wiring. One other thing to consider is I want to build my harness to integrate in the future for the GDL88 ADS-B so I can fly in the states. I'm not sure how easy it is to get info on that if I did it myself..
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Old 04-09-2018, 01:27 PM   #14
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Default Re: Garmin Panel - trying to figure out all the details

I've slightly modified my list above, but that said, I'm considering a full wiring harness custom made and tested from stein air. It's not cheap, but is it worth it - for me yes. Peace of mind, and time.
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Old 04-09-2018, 08:22 PM   #15
DesertFox4
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Default Re: Garmin Panel - trying to figure out all the details

TCW, one of our great site sponsors, makes backup batteries for all glass panels.
Also they provide comprehensive wire schematics.
http://www.tcwtech.com
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