Backup battery test impossible after the first yea

[Tuiliere]

Hello,

After my first year using my Dynon Skyview System on my RV7 (2 screens), message "Backup battery need" appeared. My first battery test has been made with success but it is impossible to make the second one because this battery is not fully charged. Can you tell me if my second battery is faulty and how to be sure it is ? What is the Standby Status ? I precise I made a one hour flight before the tests, in order to be sure the batteries are fully charged.
I join 2 screenshots of my 2 backup battery, the first is the wrong one (11,36V)
In advance thank you
Sylvain

 

[Raymo]

The possible charge status is as follows (from the install manual):

CHARGE STATUS: CHARGING/DISCHARGED/CHARGED/STANDBY/NO BATTERY

STANDBY means the battery is not charging, discharging or charged. Also, per the manual, it could take up to 4 hours to fully charge a battery that has been discharged.

I would suggest connecting a proper charger to the aircraft battery and power on the screen that has the battery in STANDBY state. Once the AC battery is above 12.25 volts, you should see it change to CHARGING.

 

[CGameProgrammer]

Both displays say that the test passed. Standby is almost the same as charged, with the only difference being that battery voltage is less than 12V at the moment.

By the way, I want to emphasize that Ray is talking about the aircraft's lead-acid battery and NOT Dynon's backup battery. Never directly charge the backup battery!

 

[Tuiliere]

Thank you for your reply.
CGgameprogramer, the test is not passed on my first screenshot. The last test is 3-15-2016 that mean last year !
When I power on my Skyview System, Battery test needed is always asked on this screen with the impossibility to do it.
I am going to charge it as Ray said today.

Sylvain

 

[airguy]

Thank you for your reply.
CGgameprogramer, the test is not passed on my first screenshot. The last test is 3-15-2016 that mean last year !
When I power on my Skyview System, Battery test needed is always asked on this screen with the impossibility to do it.
I am going to charge it as Ray said today.

Sylvain

Are you saying that one screen with its backup battery tested OK, and the other screen with its own backup battery does not? You have 2 screens and 2 backup batteries?

 

[Tuiliere]

Yes, Sorry for my bad english..I have 2 screens and 2 backup batteries but one of them seems to be faulty..

 

[CGameProgrammer]

There is no requirement to fly for one hour before testing and in fact the manual states that 4 hours of flying time are required to fully charge a fully depleted backup battery, although 11.36V is healthy and not depleted. After you fly, does that battery's voltage increase? It should. If not then you have some kind of charging problem, or maybe your alternator is too weak? You can also charge the batteries on the ground by turning the displays on and using a battery charger to charge your plane's lead-acid battery with at least 5A, according to the manual the displays should charge the backup batteries in this state.

 

[Tuiliere]

Yesterday I flew one hour. After that, battery information was 11,49V - statut charging.
But it seems it is a very very low charge rate ?
I flew 10 hours in April and the battery is still not fully charged ?
Nothing says to me it is out of order but if I compare to my first one, it is evident the charge rate is not normal..

 

[CGameProgrammer]

Your alternator might be weak. Verify by keeping your other screen off and only using the screen with the low battery. See if it charges the battery more quickly that way.

 

[Tuiliere]

I am a little bit septique. It is a 60A from Plane Power and it is brand new (80 hours)..

 

[Raymo]

I have the same alternator on my RV-7A and it charges the batteries fine but I did have a similar instance before flying where the backup battery was low. I did as recommended above and charged the ship battery while one screen at a time was on (not both since the 8 amp charger could not charge both at the same time).

 

[GalinHdz]

Is your alternator voltage approximately 13.8v? I have found that if significantly below that the battery will still charge but at a much slower rate.

 

[Tuiliere]

My alternator voltage is 14V-14,3V in flight. So I don't think it is faulty.

 

[GalinHdz]

Try swapping the batteries from one screen to the other. Connect the battery currently connected to screen #1 to screen #2 and connect the battery currently connected to screen #2 to Screen #1. After this, go fly for at least 1hr then do a battery test on both screens. This will tell you if there is a problem.

If there is a problem, this will help identify if the problem is with the battery or the screen charging circuit.

 

[Tuiliere]

I connected a charger to my battery and then, after a little hour, the backup battery seems to be charged (see screenshot one). But when I launch the battery test, it failed 32 minutes after. I tried 3 times and it's always the same (see screenshot 2). So I am going to exchange this battery with a new one.









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[CGameProgrammer]

Nominal voltage of the battery is only 11.1V and I think mine went to 10.6V after 45+ minutes if I remember right. I do agree you need to swap batteries to verify the problwm is with the battery and not the display.

 

[Tuiliere]

Both of my two backup batteries shows 12,1V on the local display setup page. But when you launch the battery test, you can see on the bottom on the screen the real voltage. For the left one (the good one) it is 10,88V at the beginning of the test, and for the right one (the wrong one) it is 10,75V. I think it is this little difference which make the test failed.

 

[GalinHdz]

At this point you do not know if your battery is bad or there is something wrong with your display (Bad connection, bad display charging circuit, etc.). By swapping the batteries from one display to the other you will help isolate if the problem is with the battery or not.

 

[Tuiliere]

Hello,

On final I changed my battery ( under warranty) and the test is now OK.
Thanks for your help

Sylvain