Today's Message Index:
----------------------
1. 03:43 AM - Re: Lithium: State of the technology (stephen092)
2. 06:41 AM - Re: Small Lithium Battery Precautions (Ernest Christley)
3. 06:41 AM - Re: Cable end crimping (Robert L. Nuckolls, III)
4. 07:11 AM - Re: Cable end crimping (Bill Allen)
5. 08:02 AM - Re: Z 16 OVP fuselink question (CORRECTION) (William Daniell)
6. 08:05 AM - Re: Small Lithium Battery Precautions (Alec Myers)
7. 08:06 AM - New Antennae (speedy11@aol.com)
8. 08:16 AM - Re: Small Lithium Battery Precautions (user9253)
9. 08:32 AM - Re: Small Lithium Battery Precautions (user9253)
10. 08:36 AM - Re: Small Lithium Battery Precautions (David Lloyd)
11. 08:40 AM - Bus bar materials (Robert L. Nuckolls, III)
12. 08:56 AM - Authority to solder splice a wire (Jeff Page)
13. 09:00 AM - Re: Z 16 OVP fuselink question (CORRECTION) (Charlie England)
14. 09:18 AM - Re: Small Lithium Battery Precautions (Charlie England)
15. 09:43 AM - Re: New Antennae (Robert L. Nuckolls, III)
16. 10:14 AM - Re: Z 16 OVP fuselink question (CORRECTION) (William Daniell)
17. 10:17 AM - Re: Re: Small Lithium Battery Precautions (GTH)
18. 10:38 AM - Anybody using Shorai batteries/BMS? (jonlaury)
19. 01:33 PM - TyWraps redux (Robert L. Nuckolls, III)
20. 01:53 PM - Re: Z 16 OVP fuselink question (CORRECTION) (Robert L. Nuckolls, III)
21. 01:58 PM - Re: Authority to solder splice a wire (Robert L. Nuckolls, III)
22. 02:45 PM - Re: New Antennae (speedy11)
23. 04:13 PM - Re: Small Lithium Battery Precautions (user9253)
24. 05:06 PM - Re: Anybody using Shorai batteries/BMS? (Allan Aaron)
25. 07:15 PM - Re: Bus bar materials (Art Zemon)
26. 08:24 PM - Faston / Aveo Tab Terminals (Art Zemon)
27. 09:35 PM - Re: Faston / Aveo Tab Terminals (Eric Page)
Message 1
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Subject: | Re: Lithium: State of the technology |
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Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=479930#479930
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Subject: | Re: Small Lithium Battery Precautions |
I don't understand the physics of this, Joe.=C2- If I have a small, drain
ed lithium battery hanging on a 60amp alternator, it could have the full 60
shoved down its throat.=C2- If I hang a larger lithium beside it, the tw
o would share the current in some unknown proportion based on relative inte
rnal and installation resistance.=C2- If I hung 10 lithium batteries on t
hat same alternator, they *might* protect each other to the point of the pi
lot not ever having anything to worry about.
At least, that is how I understand the physics.=C2- I guess what I don't
understand is hw does having a larger lithium hanging in parallel to a smal
ler one result in more risk?
On Monday, May 7, 2018 1:42 PM, user9253 <fransew@gmail.com> wrote:
Lithium batteries have low internal resistance.=C2- Unlike Lead Acid batt
eries, Lithium batteries, if run down, could accept the full output capacit
y of the alternator.=C2- Therefore the battery should be sized based on t
he alternator size.=C2- If two Lithium batteries are installed, one big a
nd one small, the small battery could be charged at too high of a rate.=C2
- For instance, a 60 amp alternator could pump a full 60 amps into a 3 am
p-hour Lithium battery if the battery was completely run down.=C2- To pre
vent that, EarthX recommends putting a diode in series with the charging ci
rcuit.=C2- The diode should have a voltage drop of 0.5 (Schottky diode).
=C2- Lower charging voltage results in less current.=C2- Read all about
it in this document by EarthX:
https://earthxbatteries.com/dual-bus-lithium-battery-design
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=479917#479917
-
S -
WIKI -
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=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
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Subject: | Re: Cable end crimping |
At 08:09 AM 5/7/2018, you wrote:
>Following on from that, I need to extend my starter motor feed, -
>could anyone point me to a supplier of large but-splice connectors?
Why not just replace the wire? How long
is it? Have you considered welding cable
from local supplier . . . they might even
be able to hydraulically apply terminals
for a decent price.
Bob . . .
Message 4
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Subject: | Re: Cable end crimping |
Replacing the wire was a possibility, but it runs so deep and long into the
wing/fuselage that it would be more surgery than just replacing the section
in the engine bay which had the last 4=9D overheat due to a poor con
nection.
I=99m thinking something like this;
https://www.amazon.com/Panduit-SCS2-0-X-Conductor-Standard/dp/B007EWQDSU/re
f=sr_1_19?ie=UTF8&qid=1525699768&sr=8-19&keywords=%232+wire+butt+
splicesHere
Bill
On Tue, 8 May 2018 at 15:46, Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> At 08:09 AM 5/7/2018, you wrote:
>
> Following on from that, I need to extend my starter motor feed, - could
> anyone point me to a supplier of large but-splice connectors?
>
>
> Why not just replace the wire? How long
> is it? Have you considered welding cable
> from local supplier . . . they might even
> be able to hydraulically apply terminals
> for a decent price.
>
>
> Bob . . .
>
--
Bill Allen
LongEz160 N99BA FD51
CZ4 G-BYLZ EGBJ
Message 5
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Subject: | Re: Z 16 OVP fuselink question (CORRECTION) |
So continuing this theme on z16 can you explain why the alt has a 16 awg
fuse link and the buss doesnt?
Thanks
Will
On Fri, May 4, 2018, 18:40 Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> The redirection link didn't capture the whole
> page . . . here's a 'fix' . . .
>
>
> * Fusible links in vehicles are expected to protect major feeders of a
> distribution system against hard faults . . . generally experienced only
> during major disassembly of the vehicle. By hard fault, were talking
> many times hundreds to thousands of amps supplied by a battery . . . not
> the soft fault precipitated by a failing appliance. *
> https://goo.gl/up9oNB
>
>
> Bob . . .
>
>
> Bob . . .
>
Message 6
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Subject: | Re: Small Lithium Battery Precautions |
I don=99t think Joe intended the large one creates the risk.
I understood the risk was the to the small one, with the possible
misunderstanding by the installer that the presence of the large battery
protects the small, which it doesn=99t.
On May 8, 2018, at 09:39, Ernest Christley <echristley@att.net
<mailto:echristley@att.net>> wrote:
I don't understand the physics of this, Joe. If I have a small, drained
lithium battery hanging on a 60amp alternator, it could have the full 60
shoved down its throat. If I hang a larger lithium beside it, the two
would share the current in some unknown proportion based on relative
internal and installation resistance. If I hung 10 lithium batteries on
that same alternator, they *might* protect each other to the point of
the pilot not ever having anything to worry about.
At least, that is how I understand the physics. I guess what I don't
understand is hw does having a larger lithium hanging in parallel to a
smaller one result in more risk?
On Monday, May 7, 2018 1:42 PM, user9253 <fransew@gmail.com
<mailto:fransew@gmail.com>> wrote:
<mailto:fransew@gmail.com>>
Lithium batteries have low internal resistance. Unlike Lead Acid
batteries, Lithium batteries, if run down, could accept the full output
capacity of the alternator. Therefore the battery should be sized based
on the alternator size. If two Lithium batteries are installed, one big
and one small, the small battery could be charged at too high of a rate.
For instance, a 60 amp alternator could pump a full 60 amps into a 3
amp-hour Lithium battery if the battery was completely run down. To
prevent that, EarthX recommends putting a diode in series with the
charging circuit. The diode should have a voltage drop of 0.5 (Schottky
diode). Lower charging voltage results in less current. Read all about
it in this document by EarthX:
https://earthxbatteries.com/dual-bus-lithium-battery-design
<https://earthxbatteries.com/dual-bus-lithium-battery-design>
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=479917#479917
<http://forums.matronics.com/viewtopic.php?p=479917#479917>
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I am installing two new antennae - one Comant 122 for comm and one standard ball
tipped 3 inch transponder=type for an Echo UAT.
I am retaining two older antennae - one comm and one transponder. The real estate
for mounting is limited since they are all mounted on the fuselage underside
of an RV-8. I should be able to come close to the desired one meter separation
between all antennae.
My question is - do I need to remove exterior paint and interior primer paint at
the mounting location of the new antennae? Or is the mounting screw contact
sufficient to connect with the ground plane? I will, of course, have a doubler
for mounting each antenna.
Thanks
Stan Sutterfield
Message 8
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Subject: | Re: Small Lithium Battery Precautions |
The size of any installed battery must be chosen so that it is capable of accepting
the full output of the alternator. If it is desired to use a smaller Lithium
battery that can not accept the full alternator output, then some means must
be used to limit the charging current to that small battery if it happens
to be almost discharged. You are right that if there are always other aircraft
loads using current, then the full alternator output is no longer available
to charge a battery. I guess I did not word my previous post very well and it
is confusing. Two different sized Lithium batteries in parallel does not result
in more risk. The only risk is when a Lithium battery is charged with more
current than it is rated for. If the battery happens to be completely run down,
then it will accept the full alternator output which might be too great for
the size of battery. One way to limit the charging current is to install a
series Schottky diode. The EarthX document (that I provided a link to in my
original post) explains it a lot more clearly than I can.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=479942#479942
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Subject: | Re: Small Lithium Battery Precautions |
Even if only one Lithium battery is installed in the aircraft, the size of that
battery must be such that it can accept the full alternator output. If the installer
bases the battery size only on its ability to crank the engine without
considering the size of the alternator, then a large alternator might force
too much current into the Lithium battery and damage it. (Fire)
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=479945#479945
Message 10
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Subject: | Re: Small Lithium Battery Precautions |
Every battery has a certain "internal resistance -IR" build in due to its c
hemistry, connectivity inside, age, temperature, etc., etc. This resistanc
e is variable and very low; in milliohms, but, it is there.
Suppose the smaller of the two batteries has a lower IR than the larger one
=2E The alternator is only looking at the resistance of its load; it reall
y doesn't know that it is a battery, only a load. And, since the smaller i
n this case may have a lower load IR resistance, the majority of the curren
t is headed into the small battery first. At least, until its IR changes a
nd goes higher, then, current is deflected or shared with the other battery
in parallel..... In the case of a much discharged small battery, the curre
nt going in could exceed its capability to cope. . . .
---------------------------------------------------------------------------
-----
----- Original Message -----
From: Ernest Christley
To: aeroelectric-list@matronics.com
Sent: Tuesday, May 08, 2018 6:39 AM
Subject: Re: AeroElectric-List: Small Lithium Battery Precautions
I don't understand the physics of this, Joe. If I have a small, drained
lithium battery hanging on a 60amp alternator, it could have the full 60 sh
oved down its throat. If I hang a larger lithium beside it, the two would
share the current in some unknown proportion based on relative internal and
installation resistance. If I hung 10 lithium batteries on that same alte
rnator, they *might* protect each other to the point of the pilot not ever
having anything to worry about.
At least, that is how I understand the physics. I guess what I don't und
erstand is hw does having a larger lithium hanging in parallel to a smaller
one result in more risk?
On Monday, May 7, 2018 1:42 PM, user9253 <fransew@gmail.com> wrote:
Lithium batteries have low internal resistance. Unlike Lead Acid batteri
es, Lithium batteries, if run down, could accept the full output capacity o
f the alternator. Therefore the battery should be sized based on the alter
nator size. If two Lithium batteries are installed, one big and one small,
the small battery could be charged at too high of a rate. For instance, a
60 amp alternator could pump a full 60 amps into a 3 amp-hour Lithium batt
ery if the battery was completely run down. To prevent that, EarthX recomm
ends putting a diode in series with the charging circuit. The diode should
have a voltage drop of 0.5 (Schottky diode). Lower charging voltage resul
ts in less current. Read all about it in this document by EarthX:
https://earthxbatteries.com/dual-bus-lithium-battery-design
--------
Joe Gores
---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
Message 11
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Subject: | Bus bar materials |
At 10:03 PM 5/6/2018, you wrote:
>Joe,
>
>Thank you for that calculation. It sounds like thicker material
>would be better.
>I think that I will try flattening a piece of copper tube. Any
>excuse to play with
>a hydraulic press and solder in the same day is a good excuse
>
>On Sun, May 6, 2018 at 9:43 PM, user9253
><<mailto:fransew@gmail.com>fransew@gmail.com> wrote:
><<mailto:fransew@gmail.com>fransew@gmail.com>
>The area of your bus bar is 0.025 x 0.5 = 0.0125
>0.0125 equals 12,500 circular mills which is slightly bigger than 10 AWG.
"Circular mills" is a different kind of area. It's simply the diameter of
a conductor in thousandths squared. 10AWG ~ 0.100" diameter
or 100 mills. 100^2 is 10,000 hence the circular mill rating
of 10,000. The real cross section of 10AWG is pi x radius^2
or 0.05 x 0.05 x 3.14 = 0.0078 square inches.
Circular mills are a unit of area PROPORTIONAL to cross
section. The cross section of the cited brass bus
bar is indeed 0.0125 Square Inches which is about
1.5 times the cross section of a 10AWG solid wire . . .
but let us consider another case:
Suppose you have a wire 1.000 inches in diameter (1000 'mils').
The CMA value for this conductor would be 1 million while the
cross section would be 0.5 x 0.5 x 3.14 or 0.785 square inches.
A bar having a cross section of 1.000 x 0.785 would have
an area of 785,000 square mills . . . the same cross section as a
1.000" diameter wire of 1,000,000 CMA.
So when comparing the cross section of the bus with that of
10AWG wire, be aware of the 0.785:1 ratio between square mills
and circular mils.
Another consideration in this thread is the relative conductivity
of the materials being considered. Copper and brass have wide
ranges of RESISTANCE. Resistance is the major driver in a conductor's
ability to (1) transport the energy with acceptable losses and (2)
carry the current while maintaining temperature rise below
acceptable limits.
Silver has a resistance of 1.6 uOhm/cu-cm
Copper is something like of 1.7 uOhm/cu-cm
Aluminum alloys . . . 3 to 6 uOhm/cu-cm
Copper alloys (Brass) . . . . 6 to 10 uOhm/cu-cm
Of all common materials for use as stud-to-stud bar
construction, copper is electrically superior with brass trailing
a distant 4th place.
'Copper equivalent' brass bars may be fabricated
by making the cross section ~4 times that of
the copper one.
Aluminum has been used in production aircraft with
good success and only needs to be 2x fatter
electrically . . . but is thermally superior
for heat conduction . . . so copper and aluminum
are about equal.
The biggest caveat for using aluminum is to strive
for gas-tight electrical joints . . . moisture present
at the interface between differing alloys combined
l with oxygen promotes corrosion which in time can
lead to joint failure. Coating the surfaces with some
robust moisture barrier (DC4 or even WD40) before
making up the joint will impeded moisture/oxygen ingress.
For the instance that germinated this thread, I'll suggest
that an aluminum bar cut from sheet or off the shelf
extrusion is easy to fabricate . . . and the parallel
surfaces go to achieving gas-tight interfaces of the
made up joints. Copper sheet good too. Mashing copper
tube is kinda good if you can really put the mash on
the material between PARALLEL jaws.
If it were my airplane, I'd go for aluminum sheet
with some good 'dope' in the joints. Aluminum is a
whole lot easier to drill!
Bob . . .
Message 12
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Subject: | Authority to solder splice a wire |
AeroElectic Wizards:
I replaced the coiled wired that connects the push to talk switch on
the yoke of my Cessna 172.
This meant splicing the coiled wire with the regular wire that runs
behind the instrument panel to the intercom.
I twisted and soldered the wires and covered them with heat shrink.
The log book entry needs to read something like:
Push to talk wiring replaced, using AC4313-1B section X-XX as a guide.
I cannot find any section that discussed splicing wires in this manner !
Does someone have a reference within an authoritative document that I
can cite indicating this is an acceptable method of repair ?
Thanks !
Jeff Page
Dream Aircraft Tundra #10
Message 13
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Subject: | Re: Z 16 OVP fuselink question (CORRECTION) |
The link protects the 12awg from the battery, in case of a hard fault on
that line. (Think about faults under the cowl, where you'd never see/smell
them in operation.)
The feed to the main bus is protected from the battery by the master
contactor, with the expectation that the pilot would detect the fault and
manually turn off the master. Common FAA-accepted practice in certified
planes.
On Tue, May 8, 2018 at 9:52 AM, William Daniell <wdaniell.longport@gmail.com
> wrote:
> So continuing this theme on z16 can you explain why the alt has a 16 awg
> fuse link and the buss doesnt?
>
> Thanks
>
> Will
>
> On Fri, May 4, 2018, 18:40 Robert L. Nuckolls, III <
> nuckolls.bob@aeroelectric.com> wrote:
>
>> The redirection link didn't capture the whole
>> page . . . here's a 'fix' . . .
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> * Fusible links in vehicles are expected to protect major feeders of a
>> distribution system against hard faults . . . generally experienced only
>> during major disassembly of the vehicle. By hard fault, were talking
>> many times hundreds to thousands of amps supplied by a battery . . . not
>> the soft fault precipitated by a failing appliance. *
>> https://goo.gl/up9oNB
>>
>>
>> Bob . . .
>>
>>
>> Bob . . .
>>
>
Message 14
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Subject: | Re: Small Lithium Battery Precautions |
The issue wouldn't be that the smaller of two Li batteries would have lower
inherent internal resistance (it shouldn't), but that the smaller might be
fully discharged and the larger be fully charged. In that situation, the
lion's share of charge current would flow to the small battery.
Having said that, it raises one of my gripes with the EarthX products. They
are supposed to have a robust battery management system built in. That
battery management system supposedly controls charging, up to and including
cell balancing. The BMS sits between the charging source and the cells of
the battery. If it's doing its job, *the BMS* should be controlling charge
current into each cell; *not* the generating source. Telling us that a
too-large alternator can damage their battery is admitting that the BMS...
isn't.
Rant mode off....
Charlie
On Tue, May 8, 2018 at 10:34 AM, David Lloyd <skywagon@charter.net> wrote:
> Every battery has a certain "internal resistance -IR" build in due to its
> chemistry, connectivity inside, age, temperature, etc., etc. This
> resistance is variable and very low; in milliohms, but, it is there.
>
> Suppose the smaller of the two batteries has a lower IR than the larger
> one. The alternator is only looking at the resistance of its load; it
> really doesn't know that it is a battery, only a load. And, since the
> smaller in this case may have a lower load IR resistance, the majority of
> the current is headed into the small battery first. At least, until its IR
> changes and goes higher, then, current is deflected or shared with the
> other battery in parallel..... In the case of a much discharged small
> battery, the current going in could exceed its capability to cope. . . .
>
> ------------------------------
>
> ----- Original Message -----
> *From:* Ernest Christley <echristley@att.net>
> *To:* aeroelectric-list@matronics.com
> *Sent:* Tuesday, May 08, 2018 6:39 AM
> *Subject:* Re: AeroElectric-List: Small Lithium Battery Precautions
>
> I don't understand the physics of this, Joe. If I have a small, drained
> lithium battery hanging on a 60amp alternator, it could have the full 60
> shoved down its throat. If I hang a larger lithium beside it, the two
> would share the current in some unknown proportion based on relative
> internal and installation resistance. If I hung 10 lithium batteries on
> that same alternator, they *might* protect each other to the point of the
> pilot not ever having anything to worry about.
>
> At least, that is how I understand the physics. I guess what I don't
> understand is hw does having a larger lithium hanging in parallel to a
> smaller one result in more risk?
>
>
> On Monday, May 7, 2018 1:42 PM, user9253 <fransew@gmail.com> wrote:
>
>
>
> Lithium batteries have low internal resistance. Unlike Lead Acid
> batteries, Lithium batteries, if run down, could accept the full output
> capacity of the alternator. Therefore the battery should be sized based on
> the alternator size. If two Lithium batteries are installed, one big and
> one small, the small battery could be charged at too high of a rate. For
> instance, a 60 amp alternator could pump a full 60 amps into a 3 amp-hour
> Lithium battery if the battery was completely run down. To prevent that,
> EarthX recommends putting a diode in series with the charging circuit. The
> diode should have a voltage drop of 0.5 (Schottky diode). Lower charging
> voltage results in less current. Read all about it in this document by
> EarthX:
> https://earthxbatteries.com/dual-bus-lithium-battery-design
>
> --------
> Joe Gores
>
>
> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=icon> Virus-free.
> www.avast.com
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>
Message 15
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Subject: | Re: New Antennae |
At 10:04 AM 5/8/2018, you wrote:
>I am installing two new antennae - one Comant 122 for comm and one
>standard ball tipped 3 inch transponder=type for an Echo UAT.
>I am retaining two older antennae - one comm and one
>transponder. The real estate for mounting is limited since they are
>all mounted on the fuselage underside of an RV-8. I should be able
>to come close to the desired one meter separation between all antennae.
>My question is - do I need to remove exterior paint and interior
>primer paint at the mounting location of the new antennae? Or is
>the mounting screw contact sufficient to connect with the ground
>plane? I will, of course, have a doubler for mounting each antenna.
>Thanks
>Stan Sutterfield
https://goo.gl/skAS8R
Bob . . .
Message 16
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Subject: | Re: Z 16 OVP fuselink question (CORRECTION) |
Charlie thanks
So it wouldn't be "wrong" to put a fuselink in the line to the buss?
WIll
William Daniell
LONGPORT
+57 310 295 0744
On Tue, May 8, 2018 at 10:59 AM, Charlie England <ceengland7@gmail.com>
wrote:
> The link protects the 12awg from the battery, in case of a hard fault on
> that line. (Think about faults under the cowl, where you'd never see/smell
> them in operation.)
> The feed to the main bus is protected from the battery by the master
> contactor, with the expectation that the pilot would detect the fault and
> manually turn off the master. Common FAA-accepted practice in certified
> planes.
>
> On Tue, May 8, 2018 at 9:52 AM, William Daniell <
> wdaniell.longport@gmail.com> wrote:
>
>> So continuing this theme on z16 can you explain why the alt has a 16 awg
>> fuse link and the buss doesnt?
>>
>> Thanks
>>
>> Will
>>
>> On Fri, May 4, 2018, 18:40 Robert L. Nuckolls, III <
>> nuckolls.bob@aeroelectric.com> wrote:
>>
>>> The redirection link didn't capture the whole
>>> page . . . here's a 'fix' . . .
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> * Fusible links in vehicles are expected to protect major feeders of
>>> a distribution system against hard faults . . . generally experienced
>>> only during major disassembly of the vehicle. By hard fault, were
>>> talking many times hundreds to thousands of amps supplied by a battery .
>>> . . not the soft fault precipitated by a failing appliance. *
>>> https://goo.gl/up9oNB
>>>
>>>
>>> Bob . . .
>>>
>>>
>>> Bob . . .
>>>
>>
>
Message 17
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Subject: | Re: Small Lithium Battery Precautions |
Le 08/05/2018 17:16, user9253 a crit:
> If it is desired to use a smaller Lithium battery that can not accept the full
alternator output, then some means must be used to limit the charging current
to that small battery if it happens to be almost discharged.
Hi all,
Isn't that what the Battery Management System is for ?
I would have thought that every Lithium battery *must* have such a
device to monitor and manage the charging of each and every element in
the battery, and to prevent overcharging.
The alternator doesn't directly "see" the battery internal resistance,
but rather the BMS interface.
Last year when I ordered two EarthX batteries for installation on a new
aircraft, the - knowledgeable - sales person did not express any concern
over the type or rating of the alternator.
Bottom line, is this a real issue ?
Just wondering,
--
Best regards,
Gilles
http://contrails.free.fr
http://lapierre.skunkworks.free.fr
Message 18
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Subject: | Anybody using Shorai batteries/BMS? |
I saw a pic of Dave Anders' RV4 with two Shorai bats, sharing a BMS. Anyone on
the list using Shorai stuff?
If you are, please tell us your engine displacement and product part #'s, and briefly
your electrical architecture. Hours flown and how it's all working out
would be helpful as well.
Thanks,
John
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=479956#479956
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In a recent thread, TyWraps were discussed as a solution
for wire bundle management. We had some discussions on
these products about ten years back . . .
In years since, I've had occasion to throw out stocks
of unused TyWraps given that they had become brittle with
age . . . the buckles would snap off in the ordinary process
of applying the wrap.
Be aware that not all that is plastic is Nylon 6,6. Evolved
over the last 80+ years by DuPont. This material and its
close cousins have found their way into all manner of component,
many of which perform in under-hood environment of automobiles.
When purchasing these critters, look for a 6-6, 6/6, 66 or even
a 6,6 description of the nylon. The last time I was in Harbor
Freight, many of their offerings bore such markings . . . but
some did not . . . especially the smaller ones in assorted colors.
All the wraps I pitched a few years ago were smaller sizes
in various colors. Some had been in my Dad's inventory for untold
years and were literally falling apart.
My favorite bundle security uses Dacron flat lace applied
like so . . .
https://goo.gl/H3z1EQ
Did a job for a rancher friend yesterday where the wiring was
installed and initially held in place with some TyWraps he had
laying around . . . after it was up and running, I dug out the
roll of flat lace and installed a wrap adjacent to each of the
TyWraps. Those plastic thingies MIGHT fall off in a few years
but I'm betting the string will still be on duty.
Bob . . .
Message 20
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Subject: | Re: Z 16 OVP fuselink question (CORRECTION) |
At 12:13 PM 5/8/2018, you wrote:
>Charlie thanks
>
>So it wouldn't be "wrong" to put a fuselink in the line to the buss?
This is a crew controlled feed from the battery . . .
not expected to be 'hot' on approach-to-the-rocks.
If contact with the ground is un-controlled . . .
then the whole system is likely to be hot . . .
existence of circuit protection probably has
no useful effect on the outcome.
Bob . . .
Message 21
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Subject: | Re: Authority to solder splice a wire |
At 10:55 AM 5/8/2018, you wrote:
>
>AeroElectic Wizards:
>
>I replaced the coiled wired that connects the push to talk switch on
>the yoke of my Cessna 172.
>This meant splicing the coiled wire with the regular wire that runs
>behind the instrument panel to the intercom.
>
>I twisted and soldered the wires and covered them with heat shrink.
>
>The log book entry needs to read something like:
>Push to talk wiring replaced, using AC4313-1B section X-XX as a guide.
There are many maintenance and/or repair activities that
don't necessarily need to be logged. The actions you described
have no safety implications. If carried out with good craftsmanship,
I wouldn't bother to record it.
Bob . . .
Message 22
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Subject: | Re: New Antennae |
Perfect. Thanks, Bob.
Stan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=479961#479961
Message 23
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Subject: | Re: Small Lithium Battery Precautions |
My posts above were based upon my interpretation of an EarthX document, which can
be found here:
https://earthxbatteries.com/dual-bus-lithium-battery-design
_
EarthX also has some interesting FAQ (Frequently Asked Questions) here:
https://earthxbatteries.com/faqs
_
EarthX lists the 3 main considerations when choosing a battery for your aircraft:
1. Will it crank the engine?
2. Is its capacity enough to supply power after the alternator fails?
3. Is it sized for the alternator?
https://earthxbatteries.com/product-category/experimental-aircraft
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=479962#479962
Message 24
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Subject: | Anybody using Shorai batteries/BMS? |
For what its worth, I had a Shorai, lasted 6 months of light duty use then started
bulging and died. Since it failed more than 12 months after purchase, the
vendor would not replace it. I bought an EarthX and it has been great. I wouldn't
touch another Shorai.
Allan
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com <owner-aeroelectric-list-server@matronics.com>
On Behalf Of jonlaury
Sent: Wednesday, 9 May 2018 3:38 AM
Subject: AeroElectric-List: Anybody using Shorai batteries/BMS?
--> <jonlaury@impulse.net>
I saw a pic of Dave Anders' RV4 with two Shorai bats, sharing a BMS. Anyone on
the list using Shorai stuff?
If you are, please tell us your engine displacement and product part #'s, and briefly
your electrical architecture. Hours flown and how it's all working out
would be helpful as well.
Thanks,
John
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=479956#479956
Message 25
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Subject: | Re: Bus bar materials |
On Tue, May 8, 2018 at 10:39 AM, Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> If it were my airplane, I'd go for aluminum sheet
> with some good 'dope' in the joints. Aluminum is a
> whole lot easier to drill!
>
=8B
Bob=8B,
=8BThat's good to know. I have a whole boatload of scrap aluminum.
=8B
When you say "dope," do you mean dielectric grease like this:
https://www.homedepot.com/p/CRC-3-3-oz-Technician-Grade-Dielectric-Grease-0
5113/206843029
?
-- Art Z.
--
https://CheerfulCurmudgeon.com/
*"If I am not for myself, who is for me? And if I am only for myself, what
am I? And if not now, when?" Hillel*
Message 26
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Subject: | Faston / Aveo Tab Terminals |
Folks,
Does Digikey (or anyone) sell these terminals?
http://www.aircraftspruce.com/catalog/elpages/aveotabterminals.php
They are regular Faston terminals but have a little tab on the bottom to
keep them from slipping out of a plastic housing.
Thanks,
-- Art Z.
--
https://CheerfulCurmudgeon.com/
*"If I am not for myself, who is for me? And if I am only for myself, what
am I? And if not now, when?" Hillel*
Message 27
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Subject: | Re: Faston / Aveo Tab Terminals |
Here are three 0.25"-width versions at Digi-Key for various wire gauges:
https://www.digikey.com/product-detail/en/te-connectivity-amp-connectors/42100-1/A27935CT-ND/456897
https://www.digikey.com/product-detail/en/te-connectivity-amp-connectors/60249-1/A27929CT-ND/456893
https://www.digikey.com/product-detail/en/te-connectivity-amp-connectors/1-1393310-8/A117815CT-ND/4729959
There are probably others; you just have to scrutinize the photos and drawings.
Eric
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