Today's Message Index:
----------------------
1. 04:47 AM - Re: Report on New Power Supply (ROGER & JEAN CURTIS)
2. 06:28 AM - Re: Report on New Power Supply (Robert L. Nuckolls, III)
3. 09:04 AM - Re: Report on New Power Supply (Robert L. Nuckolls, III)
4. 04:53 PM - Report on New Power Supply (David Lloyd)
5. 05:45 PM - Re: Re: Low Cost WigWag Alternatives (Paul Zimmer)
6. 10:54 PM - Re: building a batter capacity tester (MLWynn@aol.com)
Message 1
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| Subject: | Report on New Power Supply |
Interestingly, if you look closely at the photo on the eBay listing you can
see printed on the top of the supply "AC 176-264V". Not that anyone would
notice that when bidding...
Yes, I noticed this when it was posted a couple of weeks ago
and I sent a question to the seller. The answer back was 100 - 264V input.
If you look at their spec sheet on eBay it does say 100 -
264V even though the pic shows 176 - 264V.
If you have 220VAC available in your shop you might try
running it at the higher voltage.
There is a lot of Chinese "junk" out there. You just have
to weigh the risk to the reward.
Roger
Message 2
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| Subject: | Re: Report on New Power Supply |
At 03:24 PM 9/13/2011, you wrote:
>A few weeks ago I reported that I had bought this 12 volt power supply:
>
><http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=250852141183>http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=250852141183
When shopping for an AC mains power supply to
ground run your project, consider the following:
Ideally, you're wanting to emulated an alternator,
not a battery. A supply rated at 15 volts instead
of 12 volts is likely to be adjustable down to the
14.2 to 14.6 volt range typical of most systems.
Also, go for the biggest supply you can get within
your means. This supply
http://tinyurl.com/43yuvhl
is a 15v, 350 Watt device with a cooling fan. I've
used a number of supplies from this company for other
projects and found them to be of good value.
Finally, consider adding an output isolation diode to
disconnect the supply from the battery when it is not
being powered. I believe this was suggested and illustrated
in the form of a relay or contactor by another AEC_Lister a
some days ago. Either works.
Bob . . .
////
(o o)
===========o00o=(_)=o00o========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
================================
Message 3
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| Subject: | Re: Report on New Power Supply |
> Also, go for the biggest supply you can get within
> your means. This supply
>
>http://tinyurl.com/43yuvhl
>
> is a 15v, 350 Watt device with a cooling fan. I've
> used a number of supplies from this company for other
> projects and found them to be of good value.
An AE-List member reminded me that these are "switchmode"
power supplies with a not quite zero risk of interference.
These are probably designed and tested to FCC Part 15
performance rules. FCC15 allows the device to be a 'minor'
problem but the user is responsible for discontinuing use
if it interferes with other, protected services.
The OBAM aircraft is not likely to have a problem. The
greatest potential victims are ADF and LORAN which are
essentially extinct. But be aware that some systems
may object to power produced by these devices. The
easy test is to momentarily unplug the power supply
and run battery only to see if the problem goes away.
They're not going to have a conducted emissions problem,
only radiated and that's very low risk.
Bob . . .
////
(o o)
===========o00o=(_)=o00o========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
================================
Message 4
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| Subject: | Report on New Power Supply |
Hi Bob,
Several months ago I too purchased one of these units (or similar) as it
seemed like a great method to power up the panel when working on the
electrical problems, changes, etc. Rated at 13.5 v., 350W, the first
unit I received (they come from China) would not hold voltage when
loaded with about 5-6 amps of panel load. It started at about 13.4 v.
and dropped to 12.4 when the panel was powered up. I contacted the
seller and he said to return it and he would replace it.
I did and about 4 wks later he sent me a replacement. It is functioning
in a similar fashion. No load about 13.4 and mild load drops to 12.75.
Still Ok for panel work, etc., but, I believe the spec indicate that it
should be holding a tighter regulation.
Any thoughts on what maybe going on...?
David
PS: ...voltage measurement being done with a cheap digital DVM and I do
not know if the switching power supply would cause errors that I have
not considered.....
----- Original Message -----
From: Robert L. Nuckolls, III
To: aeroelectric-list@matronics.com
Sent: Wednesday, September 14, 2011 6:24 AM
Subject: Re: AeroElectric-List: Report on New Power Supply
At 03:24 PM 9/13/2011, you wrote:
A few weeks ago I reported that I had bought this 12 volt power
supply:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=250852141183
When shopping for an AC mains power supply to
ground run your project, consider the following:
Ideally, you're wanting to emulated an alternator,
not a battery. A supply rated at 15 volts instead
of 12 volts is likely to be adjustable down to the
14.2 to 14.6 volt range typical of most systems.
Also, go for the biggest supply you can get within
your means. This supply
http://tinyurl.com/43yuvhl
is a 15v, 350 Watt device with a cooling fan. I've
used a number of supplies from this company for other
projects and found them to be of good value.
Finally, consider adding an output isolation diode to
disconnect the supply from the battery when it is not
being powered. I believe this was suggested and illustrated
in the form of a relay or contactor by another AEC_Lister a
some days ago. Either works.
Bob . . .
////
(o o)
===========o00o=(_)=o00o========
=
< Go ahead, make my day . . . >
< show me where I'm wrong. >
=======
Message 5
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| Subject: | Re: Low Cost WigWag Alternatives |
Thanks. I bought one following your recommendation.
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Brantel
Sent: Tuesday, September 13, 2011 1:33 PM
Subject: AeroElectric-List: Re: Low Cost WigWag Alternatives
The cheap NAPA relay will not work to wig-wag HID's even if you do heat them
up manually.
I use this solid state wig-wagger and it works great with em!
.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=352164#352164
Message 6
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| Subject: | Re: building a batter capacity tester |
Hey Bob,
I was looking over the specs on the West Mountain battery analyzer you
mentioned:
_http://www.westmountainradio.com/product_info.php?products_id=cba3&navcode
/cbaLink1_
(http://www.westmountainradio.com/product_info.php?products_id=cba3&navcode=/cbaLink1)
This is a very elegant piece of equipment. The information that it
provides is certainly several magnitudes of more exact than the poor man's bench
tester I was thinking to build. Further, it seems like something that my
EAA chapter could put to more regular use than I would on my own. It is
more than it would cost me to build the other, but not ridiculously expensive.
Thank you for the direction.
With this piece of equipment, would there be any reason to also have a
carbon pile load tester? Harbor Freight has one on sale for $49.95. It seems
to me that I would get much more useful data from the West Mountain unit
and could save on that expense.
Regards,
Michael Wynn
RV 8 Wiring
San Ramon, CA
In a message dated 9/12/2011 6:32:41 A.M. Pacific Daylight Time,
nuckolls.bob@aeroelectric.com writes:
At 04:50 PM 9/11/2011, you wrote:
I have been following the PC680 thread with great interest. I have a
couple for my RV8 that have been sitting around longer than I had meant for
them to sit. You know how construction goes.
I was going to build the capacity tester from the aeroelectric site:
_http://www.aeroelectric.com/articles/battest.pdf_
(http://www.aeroelectric.com/articles/battest.pdf)
This looks pretty straightforward and I assume that I can get all the
components from my local Radio Shack. The one thing I am foggy on is the 10 V.
Zener diode in the schematic. Never having used these, are they sold by
voltage or amperage or what. Specifically, how do I make sure I get the
correct component?
Keep in mind that this is more of a battery
bench-marker as opposed to a quantitative
tester.
A battery's ability to deliver energy depends
on size, condition, temperature and load. A
battery 'rated' at 20AH will deliver that amount
of output when new and generally under a very
light load compared to how you intend to used it.
Consider the exemplar plot below
This battery is 'rated' at 17 a.h. But it will
deliver that output only when loaded at .85A x
20 hours = 17 a.h. Your airplane's endurance
loads are more likely to be on the order of 4A
so you can expect about 3 hours of service or
12.75 a.h. of output. Of course, this is an as-new
performance value. You'll want to size and maintain
your battery to meed design goals when the battery
has just degraded to the point of needing replacement.
For most folks this is at 75 or 80% of new capacity.
So this particular battery could be used in a system
where endurance expectations are for 2 hours of
service at 4.25A.
The battery cap tester depicted in the book is
not intended to give you an accurate reading of
the battery's capacity. What it will do is let
you know when the battery has fallen so far below
its as-new condition as to require replacement.
If your new battery ran your exemplar load for say
200 minutes, then you would benchmark the replacement
at 150 minutes.
If you'd like to get real numbers at loads matching
your system's requirements, you'll need something like
_http://www.westmountainradio.com/product_info.php?products_id=cba3&navcode
/cbaLink1
_
(http://www.westmountainradio.com/product_info.php?products_id=cba3&navcode=/cbaLink1) I've got a couple of these critters. They were used
to produce the plots like these
_http://www.aeroelectric.com/Pictures/Curves/HF_aa_vs_Duracell.jpg_
(http://www.aeroelectric.com/Pictures/Curves/HF_aa_vs_Duracell.jpg)
_http://www.aeroelectric.com/Pictures/Curves/El-Cheeso_Battery_Test_3.jpg_
(http://www.aeroelectric.com/Pictures/Curves/El-Cheeso_Battery_Test_3.jpg)
The device can also be used as a voltage versus time
data acquisition system and get you information like
this.
_http://www.aeroelectric.com/Pictures/Curves/schumacher_3.jpg_
(http://www.aeroelectric.com/Pictures/Curves/schumacher_3.jpg)
I would not discourage you from building the po' boy's
cap-checker. It's a useful tool within its limitations.
Radio Shack won't have a 10v zener. You'll have to get
it from a supplier with a broader range of product offerings.
I'll be back in my shop later today. Let me see if I've
got one in drawer I can send you.
Bob . . .
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