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BobD
Joined: 05 Jan 2016
Posts: 112
Location: Sheffield UK
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 Posted: Tue Mar 21, 2017 2:44 am Post subject: Lightweight rechargeable battery backup unit |
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Now that the LAA have approved the use of electronic ASI & Altimeter for backup purposes as an alternative to steam driven instruments, I am considering installing a combined unit in my aircraft as a backup to my Dynon Skyview.
http://www.lightaircraftassociation.co.uk/engineering/TechnicalLeaflets/Mods%20and%20Repairs/TL%203.20%20EFIS%20in%20LAA%20Aircraft.pdf
The pre-approved one I prefer (on clarity and cost grounds) from the LAA document is the MGL ASX-1. However, it has one major drawback in that it does not have a built in battery backup.
Having spoken to a distributor, he suggested a 9V PP3 battery (possibly switchable in the circuit) would be sufficient for emergency power if the main circuit failed. However, I would prefer a re-chargeable battery, re-charged through the aircraft system, so as not to have to worry or check that the backup battery is maintained in a charged state. Despite trawling the web, and there being several commercial units and amateur wiring diagrams out there, I have found none that are specific for incorporating in an aircraft.
I am reasonably competent with a soldering iron, but less so in the theory of such things, so would be happy to construct my own on a PCB, from a detailed wiring diagram. Does anyone know of such a diagram, or a suitable lightweight and cost effective commercial device suitable for installation behind the Control Panel?
I have copied this post to the AeroElectric List.
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_________________
Bob Dawson
Europa XS TG || 912 ULS || G-NHRJ || Dynon Skyview || PilotAware || SmartAss3 |
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cakeykev(at)gmail.com
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| Posted: Tue Mar 21, 2017 5:14 am Post subject: Lightweight rechargeable battery backup unit |
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http://www.mini-box.com/picoUPS-120-12V-DC-micro-UPS-battery-backup
This board coupled to a sealed a very small 12vdc battery and the aircraft electrical system will give you a backup 12vdc that is charged from the aircraft but switches over in the event of power loss so quickly the instrument continues to work.
Kevin Challis
G ODJG
On 21 Mar 2017, at 11:44, BobD <rjd(at)bobdawson.plus.com (rjd(at)bobdawson.plus.com)> wrote:
| Quote: | --> Europa-List message posted by: "BobD" <rjd(at)bobdawson.plus.com (rjd(at)bobdawson.plus.com)>
Now that the LAA have approved the use of electronic ASI & Altimeter for backup purposes as an alternative to steam driven instruments, I am considering installing a combined unit in my aircraft as a backup to my Dynon Skyview.
http://www.lightaircraftassociation.co.uk/engineering/TechnicalLeaflets/Mods%20and%20Repairs/TL%203.20%20EFIS%20in%20LAA%20Aircraft.pdf
The pre-approved one I prefer (on clarity and cost grounds) from the LAA document is the MGL ASX-1. However, it has one major drawback in that it does not have a built in battery backup.
Having spoken to a distributor, he suggested a 9V PP3 battery (possibly switchable in the circuit) would be sufficient for emergency power if the main circuit failed. However, I would prefer a re-chargeable battery, re-charged through the aircraft system, so as not to have to worry or check that the backup battery is maintained in a charged state. Despite trawling the web, and there being several commercial units and amateur wiring diagrams out there, I have found none that are specific for incorporating in an aircraft.
I am reasonably competent with a soldering iron, but less so in the theory of such things, so would be happy to construct my own on a PCB, from a detailed wiring diagram. Does anyone know of such a diagram, or a suitable lightweight and cost effective commercial device suitable for installation behind the Control Panel?
I have copied this post to the AeroElectric List.
--------
Bob Dawson
XS TG || 912 ULS || G-NHRJ
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=467483#467483
http://www.matronics.com/Navigator?Euro==============================================================================bsp; - NEW MATRONICS LIST WIK===================================================http://www.matronics.com/contr============================================
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BobD
Joined: 05 Jan 2016
Posts: 112
Location: Sheffield UK
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| Posted: Tue Mar 21, 2017 7:06 am Post subject: Re: Lightweight rechargeable battery backup unit |
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Hi Kevin,
Thanks for your reply. I did actually come across this unit in my web search, but as it says it is for cars, I am not knowledgeable enough to know if it is also suitable for aviation. It's also from the USA, and I would prefer a UK (or UK distributed) solution if possible.
It is along the lines of the sort of thing I am looking for, it should be fairly easy to find an enclosure to house the PCB and battery.
Also the spec for this says it is for a sealed lead acid battery (fairly heavy), I was hoping to be able to use either rechargeable alkaline, NiCd or NiMH batteries. I hope my expectations aren't too ambitious, as I assume something like this is included within the other Instruments mentioned in the LAA leaflet.
| | - The Matronics Europa-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Europa-List |
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_________________
Bob Dawson
Europa XS TG || 912 ULS || G-NHRJ || Dynon Skyview || PilotAware || SmartAss3 |
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Burrilla
Joined: 25 Apr 2015
Posts: 185
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| Posted: Thu Mar 23, 2017 10:33 am Post subject: Lightweight rechargeable battery backup unit |
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I'm not an LAA Inspector only an electronics engineer but from an aviation perspective I would be considering if the unit emits any RF Noise in the VHF and 1030/1090MHz band that would cause interference with the operation of the VHF Comms and Transponder.
If the specifications don’t have any reference to interference protection then its down to someone to bench test one with suitable test equipment to see if thats the case or - see what happens when next to a VHF Receiver.
For example many cheap USB power supplies emit RF noise from the circuit converting 12v to 5v which break through the mute on a VHF comms receiver. I've also seen interference from cheap LED lamps used for nose lights do the same thing.
Interference could be either airborne or though the power cables in/out depending on how suppression for the unit has been designed.
Thats aside from any question that the LAA may have from the use as a fall back device for power and the possibility of failure in its own right as point of common mode failure for dependent instruments.
IMHO
Alan Burrill
G-OBJT
| Quote: | On 21 Mar 2017, at 15:06, BobD <rjd(at)bobdawson.plus.com> wrote:
Hi Kevin,
Thanks for your reply. I did actually come across this unit in my web search, but as it says it is for cars, I am not knowledgeable enough to know if it is also suitable for aviation. It's also from the USA, and I would prefer a UK (or UK distributed) solution if possible.
It is along the lines of the sort of thing I am looking for, it should be fairly easy to find an enclosure to house the PCB and battery.
--------
Bob Dawson
XS TG || 912 ULS || G-NHRJ
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=467492#467492
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cakeykev(at)gmail.com
Guest
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| Posted: Thu Mar 23, 2017 11:06 am Post subject: Lightweight rechargeable battery backup unit |
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The unit I suggested is used by an aircraft instrument manufacturer just covered over and sold as a package. It's a cost effective way of keeping your efis running if you lose all power. It was only a suggestion.
Kevin Challis
| Quote: | On 23 Mar 2017, at 19:32, Alan Burrill <alanb(at)dpy01.co.uk> wrote:
I'm not an LAA Inspector only an electronics engineer but from an aviation perspective I would be considering if the unit emits any RF Noise in the VHF and 1030/1090MHz band that would cause interference with the operation of the VHF Comms and Transponder.
If the specifications don’t have any reference to interference protection then its down to someone to bench test one with suitable test equipment to see if thats the case or - see what happens when next to a VHF Receiver.
For example many cheap USB power supplies emit RF noise from the circuit converting 12v to 5v which break through the mute on a VHF comms receiver. I've also seen interference from cheap LED lamps used for nose lights do the same thing.
Interference could be either airborne or though the power cables in/out depending on how suppression for the unit has been designed.
Thats aside from any question that the LAA may have from the use as a fall back device for power and the possibility of failure in its own right as point of common mode failure for dependent instruments.
IMHO
Alan Burrill
G-OBJT
> On 21 Mar 2017, at 15:06, BobD <rjd(at)bobdawson.plus.com> wrote:
>
>
>
> Hi Kevin,
> Thanks for your reply. I did actually come across this unit in my web search, but as it says it is for cars, I am not knowledgeable enough to know if it is also suitable for aviation. It's also from the USA, and I would prefer a UK (or UK distributed) solution if possible.
>
> It is along the lines of the sort of thing I am looking for, it should be fairly easy to find an enclosure to house the PCB and battery.
>
> --------
> Bob Dawson
> XS TG || 912 ULS || G-NHRJ
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=467492#467492
>
>
>
>
>
>
>
>
>
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