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Peter(at)sportingaero.com
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 Posted: Fri Dec 17, 2021 1:29 pm Post subject: Low voltage warning light |
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I’m looking for a low voltage warning light that illuminates at around 13.2 to 13.5 volts, can anyone recommend one?
I like having a large, bright, low voltage warning light in my panel that indicates when the battery is supporting the electrical loads.
A few years ago I bought a self-contained large LED from Perihelion Design, but that is no longer available and I have sold that aeroplane.
My current aeroplane does not have a good warning system so I would like to buy another.
I could build one from an op amp and a couple of resistors, but I’m not that great with electronics and I’ve got too much other stuff to do right now. The Perihelion unit was well packaged and easy to install. I would like to buy something similar. Can anyone recommend anything?
Peter
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Ceengland
Joined: 11 Oct 2020
Posts: 381
Location: MS
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| Posted: Fri Dec 17, 2021 2:22 pm Post subject: Low voltage warning light |
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On Fri, Dec 17, 2021 at 3:34 PM Peter Pengilly <Peter(at)sportingaero.com (Peter(at)sportingaero.com)> wrote:
| Quote: |
I’m looking for a low voltage warning light that illuminates at around 13.2 to 13.5 volts, can anyone recommend one?
Â
I like having a large, bright, low voltage warning light in my panel that indicates when the battery is supporting the electrical loads.
A few years ago I bought a self-contained large LED from Perihelion Design, but that is no longer available and I have sold that aeroplane.
My current aeroplane does not have a good warning system so I would like to buy another.
I could build one from an op amp and a couple of resistors, but I’m not that great with electronics and I’ve got too much other stuff to do right now. The Perihelion unit was well packaged and easy to install. I would like to buy something similar. Can anyone recommend anything?
Â
Peter
|
Hi Peter,
Dan Horton (posts on Van's Air Force, and sometimes on HBA) recommended these modules, or a similar product, from TomTop:Â
https://www.tomtop.com/p-e1021.html#flow_qa
I bought a couple to play with a couple of years ago, but have never taken the time to experiment with them. The site says they're currently out of stock, but you might be able to find a similar product on the site. You'd still need to add your own display lamp or LED; the device just provides a set of 'dry' relay contacts.
Depending on which alternator you're using, it may well have built-in low voltage detection; all you'd need to do in that case is hook up a wire to your warning light (the alternator drives an 'idiot light').
Charlie
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sportav8r(at)gmail.com
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| Posted: Fri Dec 17, 2021 2:41 pm Post subject: Low voltage warning light |
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I have a spare yellow incandescent light from B&C designed to be used with their regulators. I used a pair of these regulators for my two-alternator design, and have the low voltage warning light powered only by the regulator for the backup alternator wired so that it extinguishes as long as the main alternator is online, putting out its higher set voltage. Â
If you are using B&C or similar regulators, this bulb might be just what you need. Yours for an SASE if it can be of help to your project. Â
Should show ok in this pic.
-Bill B
On Fri, Dec 17, 2021 at 5:26 PM Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:
| Quote: |
On Fri, Dec 17, 2021 at 3:34 PM Peter Pengilly <Peter(at)sportingaero.com (Peter(at)sportingaero.com)> wrote:
| Quote: |
I’m looking for a low voltage warning light that illuminates at around 13.2 to 13.5 volts, can anyone recommend one?
Â
I like having a large, bright, low voltage warning light in my panel that indicates when the battery is supporting the electrical loads.
A few years ago I bought a self-contained large LED from Perihelion Design, but that is no longer available and I have sold that aeroplane.
My current aeroplane does not have a good warning system so I would like to buy another.
I could build one from an op amp and a couple of resistors, but I’m not that great with electronics and I’ve got too much other stuff to do right now. The Perihelion unit was well packaged and easy to install. I would like to buy something similar. Can anyone recommend anything?
Â
Peter
|
Hi Peter,
Dan Horton (posts on Van's Air Force, and sometimes on HBA) recommended these modules, or a similar product, from TomTop:Â
https://www.tomtop.com/p-e1021.html#flow_qa
I bought a couple to play with a couple of years ago, but have never taken the time to experiment with them. The site says they're currently out of stock, but you might be able to find a similar product on the site. You'd still need to add your own display lamp or LED; the device just provides a set of 'dry' relay contacts.
Depending on which alternator you're using, it may well have built-in low voltage detection; all you'd need to do in that case is hook up a wire to your warning light (the alternator drives an 'idiot light').
Charlie
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user9253
Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan
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| Posted: Fri Dec 17, 2021 3:58 pm Post subject: Re: Low voltage warning light |
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I don't have one of these but saw it on eBay for $23 plus $4 shipping.
eBay Item number: 302192182702
Description says, "blinking red indicator". Monitor trip voltage 11.9 volt +/- 10%, adjustable 10-14 volts.
Set at the factory, let us know what you need after you buy.
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Joe Gores |
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John M Tipton
Joined: 07 Aug 2018
Posts: 45
Location: Devon - England
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| Posted: Sun Dec 19, 2021 6:34 am Post subject: Re: Low voltage warning light |
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Hi Peter - Its a pity 'Bob' doesn't produce his AEC9005-201 'Low Voltage' module any more, even the parts kit would be good for a home build project if it were available - John
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nuckolls.bob(at)aeroelect
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| Posted: Sun Dec 19, 2021 7:12 am Post subject: Low voltage warning light |
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At 08:34 AM 12/19/2021, you wrote:
| Quote: | --> AeroElectric-List message posted by: "John M Tipton" <johntiptonuk(at)hotmail.com>
Hi Peter - Its a pity 'Bob' doesn't produce his AEC9005-201 'Low Voltage' module any more, even the parts kit would be good for a home build project if it were available - John |
There 'might' be a better option. I've ordered in a fist-full
of these critters:
https://tinyurl.com/y4nwk4at
They feature an LM358 dual operational amplifier
with a 30v operating voltage. Of couse we don't
yet know what the schematic looks like but the
chip ratings offer a glimmer of promise for
adequate functional characteristics . . . and
that 'transistor' next to the chip just 'might'
be a precision voltage reference . . . won't
know until they get here.
With the advent of popular LiFePO4 products
sold without battery management systems, some
builders may find value in having TWO low
voltage monitors: one for alternator failure
notification the second for battery over-discharge
notification.
Watch this space.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
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user9253
Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan
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| Posted: Sun Dec 19, 2021 10:14 am Post subject: Re: Low voltage warning light |
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It would be nice if the LED blinked to get your attention.
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Joe Gores |
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pelletie1959(at)me.com
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| Posted: Sun Dec 19, 2021 4:16 pm Post subject: Low voltage warning light |
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www.PerihelionDesign.com
Envoyé de mon iPad
| Quote: | Le 17 déc. 2021 à 17:58, Bill Boyd <sportav8r(at)gmail.com> a écrit :
I have a spare yellow incandescent light from B&C designed to be used with their regulators. I used a pair of these regulators for my two-alternator design, and have the low voltage warning light powered only by the regulator for the backup alternator wired so that it extinguishes as long as the main alternator is online, putting out its higher set voltage.
If you are using B&C or similar regulators, this bulb might be just what you need. Yours for an SASE if it can be of help to your project.
Should show ok in this pic.
-Bill B
On Fri, Dec 17, 2021 at 5:26 PM Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:
| Quote: |
On Fri, Dec 17, 2021 at 3:34 PM Peter Pengilly <Peter(at)sportingaero.com (Peter(at)sportingaero.com)> wrote:
| Quote: |
I’m looking for a low voltage warning light that illuminates at around 13.2 to 13.5 volts, can anyone recommend one?
I like having a large, bright, low voltage warning light in my panel that indicates when the battery is supporting the electrical loads.
A few years ago I bought a self-contained large LED from Perihelion Design, but that is no longer available and I have sold that aeroplane.
My current aeroplane does not have a good warning system so I would like to buy another.
I could build one from an op amp and a couple of resistors, but I’m not that great with electronics and I’ve got too much other stuff to do right now. The Perihelion unit was well packaged and easy to install. I would like to buy something similar. Can anyone recommend anything?
Peter
|
Hi Peter,
Dan Horton (posts on Van's Air Force, and sometimes on HBA) recommended these modules, or a similar product, from TomTop:
https://www.tomtop.com/p-e1021.html#flow_qa
I bought a couple to play with a couple of years ago, but have never taken the time to experiment with them. The site says they're currently out of stock, but you might be able to find a similar product on the site. You'd still need to add your own display lamp or LED; the device just provides a set of 'dry' relay contacts.
Depending on which alternator you're using, it may well have built-in low voltage detection; all you'd need to do in that case is hook up a wire to your warning light (the alternator drives an 'idiot light').
Charlie
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[img]cid:f_kxaz4ehc0[/img]
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pelletie1959(at)me.com
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| Posted: Mon Dec 20, 2021 3:07 pm Post subject: Low voltage warning light |
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You can buy these on my website PerihelionDesign.com for $49.95. I have to charge shipping of $10.00. The standard is red, blinking or steady. Please specify. I can also supply other colors.
Envoyé de mon iPad
| Quote: | Le 19 déc. 2021 à 09:41, John M Tipton <johntiptonuk(at)hotmail.com> a écrit :

Hi Peter - Its a pity 'Bob' doesn't produce his AEC9005-201 'Low Voltage' module any more, even the parts kit would be good for a home build project if it were available - John
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=505303#505303
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user9253
Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan
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| Posted: Mon Dec 20, 2021 7:42 pm Post subject: Re: Low voltage warning light |
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I don't see a low voltage warning light on PerihelionDesign.com
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Peter(at)sportingaero.com
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| Posted: Tue Dec 21, 2021 1:50 pm Post subject: Low voltage warning light |
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Daniel,
I can only see two wig-wag modules, some cable and switch guards on your website!
You used to have some great stuff, dimmers and these low-volts lights, where has it all gone?
Peter
--
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pelletie1959(at)me.com
Guest
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| Posted: Tue Dec 21, 2021 2:34 pm Post subject: Low voltage warning light |
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Sorry,
It seems that the device is discontinued and no more available. Maybe you can write to the guy if he have some in stock.
I copied the email he sended to me last year when I bought mine.
Daniel
Envoyé de mon iPhone
[quote] Le 21 déc. 2021 à 16:56, Peter Pengilly <peter(at)sportingaero.com> a écrit :

Daniel,
I can only see two wig-wag modules, some cable and switch guards on your website!
You used to have some great stuff, dimmers and these low-volts lights, where has it all gone?
Peter
--
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Peter(at)sportingaero.com
Guest
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| Posted: Wed Dec 22, 2021 2:54 pm Post subject: Low voltage warning light |
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I have to apologise to Bob, there is a paper on exactly this topic on the Aeroelectric website!
http://www.aeroelectric.com/DIY/LV_Warn_Fab_and_Install.pdf
There are also some inexpensive commercially available options produced near to me
http://www.sparkbright.co.uk/sparkright-eclipse-battery-voltage-monitor.php
https://gammatronixltd.com/epages/bae94c71-c5b6-4572-89a1-e89006e78fbe.sf/en_GB/?ObjectPath=/Shops/bae94c71-c5b6-4572-89a1-e89006e78fbe/Categories/Category1
They don't do exactly what the old Perihelion device, and Bob's AEC9005, do but for a modest price are perhaps adequate.
Peter
--
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John M Tipton
Joined: 07 Aug 2018
Posts: 45
Location: Devon - England
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| Posted: Tue Dec 28, 2021 3:02 am Post subject: Re: Low voltage warning light |
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So: what we all want it seems, is for 'Bob' to reintroduce his
AEC9005 Series Low Voltage Warning mudules
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email(at)jaredyates.com
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| Posted: Tue Dec 28, 2021 4:33 am Post subject: Low voltage warning light |
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All it would take is someone ordering a batch of printed circuit boards, right?
On December 28, 2021 06:09:44 "John M Tipton" <johntiptonuk(at)hotmail.com> wrote:
| Quote: | --> AeroElectric-List message posted by: "John M Tipton" <johntiptonuk(at)hotmail.com>
So: what we all want it seems, is for 'Bob' to reintroduce his
AEC9005 Series Low Voltage Warning mudules
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=505497#505497
=================
c-List Email Forum -
n,
FAQ,
roElectric-List
=================
MATRONICS WEB FORUMS -
s!
=================
EW MATRONICS LIST WIKI -
v> =================
ntribution Web Site -
bsp; -Matt Dralle, List Admin.
iv> =================
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bobnoffs
Joined: 04 Jul 2012
Posts: 132
Location: northern wi.
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| Posted: Tue Dec 28, 2021 12:59 pm Post subject: Low voltage warning light |
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fwiw i tried a circuit board, under the guidance of an elect. wizard i also built a board from scratch and in the end i ordered the light from perihelion .this is in the last couple of years. i talked to eric[owner] and he can design it for any voltage. and his worked, at a consistent voltage.lot different voltage for lead acid compared to lipo.
On Tue, Dec 28, 2021 at 6:36 AM Jared Yates <email(at)jaredyates.com (email(at)jaredyates.com)> wrote:
| Quote: | All it would take is someone ordering a batch of printed circuit boards, right?
On December 28, 2021 06:09:44 "John M Tipton" <johntiptonuk(at)hotmail.com (johntiptonuk(at)hotmail.com)> wrote:
c-List Email Forum -
n, FAQ, roElectric-List ================= MATRONICS WEB FORUMS - s! ================= EW MATRONICS LIST WIKI - v> ================= ntribution Web Site - bsp; Â Â Â Â Â Â Â -Matt Dralle, List Admin. iv> =================
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Ceengland
Joined: 11 Oct 2020
Posts: 381
Location: MS
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| Posted: Tue Dec 28, 2021 2:10 pm Post subject: Low voltage warning light |
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On 12/28/2021 2:58 PM, bob noffs wrote:
| Quote: | fwiw i tried a circuit board, under the guidance of an elect. wizard i also built a board from scratch and in the end i ordered the light from perihelion .this is in the last couple of years. i talked to eric[owner] and he can design it for any voltage. and his worked, at a consistent voltage.lot different voltage for lead acid compared to lipo.
On Tue, Dec 28, 2021 at 6:36 AM Jared Yates <email(at)jaredyates.com (email(at)jaredyates.com)> wrote:
| Quote: | All it would take is someone ordering a batch of printed circuit boards, right?
On December 28, 2021 06:09:44 "John M Tipton" <johntiptonuk(at)hotmail.com (johntiptonuk(at)hotmail.com)> wrote:
| Quote: | --> AeroElectric-List message posted by: "John M Tipton" <johntiptonuk(at)hotmail.com (johntiptonuk(at)hotmail.com)>
So: what we all want it seems, is for 'Bob' to reintroduce his
AEC9005 Series Low Voltage Warning mudules
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If we're using the LV warning to alert for alternator failure, I'd think the setpoint wouldn't change; the alternator is going to operate at a bit north of 14V regardless of battery chemistry. Once I know I've lost the alternator and know I'm operating on battery power (electrically dependent engine), I want to be finding the ground ASAP, and can monitor battery voltage with the voltmeter. Same should apply if in IMC with an all-electric panel, though urgency might be a *little* lower if battery consumption is lower.
 Virus-free. www.avast.com [url=#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2] [/url]
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Peter(at)sportingaero.com
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| Posted: Wed Dec 29, 2021 2:26 am Post subject: Low voltage warning light |
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In theory all that is needed is something like a TLV431 Zener, 2 or 3 resistors and a flashing 12V LED. Wouldn’t need a PCB, so Veroboard would suffice. The values of the resistors is key to the voltage set point (and so 2 or 3 in series are probably required). I have no idea of the temperature stability. Small flashing 12v LEDs are available, but a 10mm item would be desirable. So a flashing circuit would be desirable, using something like a 555IC, meaning more components, complexity and testing. Perhaps an LM311 comparator would make a better a better job of monitoring the voltage as Bob has used.
But when something that will just about do the job is available for £11 it is hardly worth breaking out the soldering iron. I have learnt a lot about what is available, and what is not. Seems that the component cost is greater than the commercially available product, even though the commercial item doesn’t do exactly I would like. Probably better to spend the time on other aspects of the overall aeroplane project.
Peter
From: owner-aeroelectric-list-server(at)matronics.com <owner-aeroelectric-list-server(at)matronics.com> On Behalf Of Jared Yates
Sent: 28 December 2021 12:32
To: aeroelectric-list(at)matronics.com
Subject: Re: Re: Low voltage warning light
All it would take is someone ordering a batch of printed circuit boards, right?
On December 28, 2021 06:09:44 "John M Tipton" <johntiptonuk(at)hotmail.com (johntiptonuk(at)hotmail.com)> wrote:
c-List Email Forum -
n,
FAQ,
roElectric-List
=================
MATRONICS WEB FORUMS -
s!
=================
EW MATRONICS LIST WIKI -
v> =================
ntribution Web Site -
bsp; -Matt Dralle, List Admin.
iv> =================
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bobnoffs
Joined: 04 Jul 2012
Posts: 132
Location: northern wi.
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| Posted: Wed Dec 29, 2021 3:53 am Post subject: Low voltage warning light |
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the problem with some low voltage monitors in the past was they let you use up a lot of lipo reserve power as they were set too low.you are right, you should be alerted as soon as alternator goes off line.
On Tue, Dec 28, 2021 at 4:14 PM Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:
| Quote: | On 12/28/2021 2:58 PM, bob noffs wrote:
| Quote: | fwiw i tried a circuit board, under the guidance of an elect. wizard i also built a board from scratch and in the end i ordered the light from perihelion .this is in the last couple of years. i talked to eric[owner] and he can design it for any voltage. and his worked, at a consistent voltage.lot different voltage for lead acid compared to lipo.
On Tue, Dec 28, 2021 at 6:36 AM Jared Yates <email(at)jaredyates.com (email(at)jaredyates.com)> wrote:
| Quote: | All it would take is someone ordering a batch of printed circuit boards, right?
On December 28, 2021 06:09:44 "John M Tipton" <johntiptonuk(at)hotmail.com (johntiptonuk(at)hotmail.com)> wrote:
| Quote: | --> AeroElectric-List message posted by: "John M Tipton" <johntiptonuk(at)hotmail.com (johntiptonuk(at)hotmail.com)>
So: what we all want it seems, is for 'Bob' to reintroduce his
AEC9005 Series Low Voltage Warning mudules
|
|
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If we're using the LV warning to alert for alternator failure, I'd think the setpoint wouldn't change; the alternator is going to operate at a bit north of 14V regardless of battery chemistry. Once I know I've lost the alternator and know I'm operating on battery power (electrically dependent engine), I want to be finding the ground ASAP, and can monitor battery voltage with the voltmeter. Same should apply if in IMC with an all-electric panel, though urgency might be a *little* lower if battery consumption is lower.
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charlesdavis(at)iuncapped
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| Posted: Wed Dec 29, 2021 6:50 am Post subject: Low voltage warning light |
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Would a Hall-effect current transducer not be a solution ... configured to keep an LED off if current is flowing, and come ON at zero current. If all systems are off, and the battery is full there may be a low enough current to light the LED, switching on a load (eg landing light) will draw current, and extinguish the LED
Charles
On 29/12/21 01:52 pm, bob noffs wrote:
| Quote: | the problem with some low voltage monitors in the past was they let you use up a lot of lipo reserve power as they were set too low.you are right, you should be alerted as soon as alternator goes off line.
On Tue, Dec 28, 2021 at 4:14 PM Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:
| Quote: | On 12/28/2021 2:58 PM, bob noffs wrote:
| Quote: | fwiw i tried a circuit board, under the guidance of an elect. wizard i also built a board from scratch and in the end i ordered the light from perihelion .this is in the last couple of years. i talked to eric[owner] and he can design it for any voltage. and his worked, at a consistent voltage.lot different voltage for lead acid compared to lipo.
On Tue, Dec 28, 2021 at 6:36 AM Jared Yates <email(at)jaredyates.com (email(at)jaredyates.com)> wrote:
| Quote: | All it would take is someone ordering a batch of printed circuit boards, right?
On December 28, 2021 06:09:44 "John M Tipton" <johntiptonuk(at)hotmail.com (johntiptonuk(at)hotmail.com)> wrote:
| Quote: | --> AeroElectric-List message posted by: "John M Tipton" <johntiptonuk(at)hotmail.com (johntiptonuk(at)hotmail.com)>
So: what we all want it seems, is for 'Bob' to reintroduce his
AEC9005 Series Low Voltage Warning mudules
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If we're using the LV warning to alert for alternator failure, I'd think the setpoint wouldn't change; the alternator is going to operate at a bit north of 14V regardless of battery chemistry. Once I know I've lost the alternator and know I'm operating on battery power (electrically dependent engine), I want to be finding the ground ASAP, and can monitor battery voltage with the voltmeter. Same should apply if in IMC with an all-electric panel, though urgency might be a *little* lower if battery consumption is lower.
Virus-free. www.avast.com [url=#m_5199142161192957910_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2] [/url]
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