Today's Message Index:
----------------------
1. 05:00 AM - Interpreting battery test results (Sam Hoskins)
2. 06:08 AM - Re: Interpreting battery test results (George, Neal E Capt USAF ACC 605 TES/TBM)
3. 06:35 AM - Re: Interpreting battery test results (Robert Borger)
4. 07:21 AM - Re: Interpreting battery test results (ROGER & JEAN CURTIS)
5. 07:43 AM - Re: Grounding ()
6. 08:09 PM - Re: Interpreting battery test results (Sam Hoskins)
Message 1
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| Subject: | Interpreting battery test results |
I just got hold of a new Oddessey PC310 battery, to use as an endurance
backup. I need to product 12 amps for something like 30-45 minutes. It is
rated at 8Ah and here is the product information:
http://www.odysseybatteries.com/battery/pc310.htm
Wanting to see what it really had in it, I hooked up the West Mountain
tester. In the test parameters, I called it and 8Ah battery and tried to
have it run at 12 amps. However, the program didn't like that, so I stepped
the current draw down to 7 amps. I set the cutoff voltage at 9 volts.
I was surprised the test lasted only 24 minutes, but even more surprised
that the resultant Tested Capacity was only 2.82 Ah.
You can see the test results here:
http://www.mistakeproofing.net/transfer/PC310_10-22-08.pdf
So, why the difference? Shouldn't the Tested Capacity be near 8Ah? Am I
misinterpreting the test results? Is there something wrong with this
brand-new battery? Was my test set-up flawed?
Sam Hoskins
Murphysboro, IL
www.samhoskins.blogspot.com
Message 2
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| Subject: | Interpreting battery test results |
Well...sorta.
You performed a valid test and got roughly the results we'd expect. The
battery you tested is likely rated for 8-ah at a current that would
discharge it in about 20-hours. Closer to 400mA - not 12 amps.
neal
________________________________
From: owner-aeroelectric-list-server@matronics.com on behalf of Sam
Hoskins
Sent: Thu 10/23/2008 6:58 AM
Subject: AeroElectric-List: Interpreting battery test results
I just got hold of a new Oddessey PC310 battery, to use as an endurance
backup. I need to product 12 amps for something like 30-45 minutes. It
is rated at 8Ah and here is the product information:
http://www.odysseybatteries.com/battery/pc310.htm
Wanting to see what it really had in it, I hooked up the West Mountain
tester. In the test parameters, I called it and 8Ah battery and tried
to have it run at 12 amps. However, the program didn't like that, so I
stepped the current draw down to 7 amps. I set the cutoff voltage at 9
volts.
I was surprised the test lasted only 24 minutes, but even more surprised
that the resultant Tested Capacity was only 2.82 Ah.
You can see the test results here:
http://www.mistakeproofing.net/transfer/PC310_10-22-08.pdf
So, why the difference? Shouldn't the Tested Capacity be near 8Ah? Am I
misinterpreting the test results? Is there something wrong with this
brand-new battery? Was my test set-up flawed?
Sam Hoskins
Murphysboro, IL
www.samhoskins.blogspot.com <http://www.samhoskins.blogspot.com/>
Message 3
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| Subject: | Re: Interpreting battery test results |
Sam,
Check that Odyssey web site document again. It shows that the battery will provide
25 amps for 9 minutes. That means that it will only provide 12 amps for
18 minutes at best. If you want 12 amps for 30-45 minutes you need a bigger battery.
Probably something on the order of a 12 amp-hour battery at a minimum.
Bob Borger
Europa XS, short wings, intercooled Rotax 914, Airmaster C/S prop.
99.999% complete. Only some extended testing to do.
On Thursday, October 23, 2008, at 06:58AM, "Sam Hoskins" <sam.hoskins@gmail.com>
wrote:
>I just got hold of a new Oddessey PC310 battery, to use as an endurance
>backup. I need to product 12 amps for something like 30-45 minutes. It is
>rated at 8Ah and here is the product information:
>http://www.odysseybatteries.com/battery/pc310.htm
>
>Wanting to see what it really had in it, I hooked up the West Mountain
>tester. In the test parameters, I called it and 8Ah battery and tried to
>have it run at 12 amps. However, the program didn't like that, so I stepped
>the current draw down to 7 amps. I set the cutoff voltage at 9 volts.
>
>I was surprised the test lasted only 24 minutes, but even more surprised
>that the resultant Tested Capacity was only 2.82 Ah.
>You can see the test results here:
>http://www.mistakeproofing.net/transfer/PC310_10-22-08.pdf
>
>So, why the difference? Shouldn't the Tested Capacity be near 8Ah? Am I
>misinterpreting the test results? Is there something wrong with this
>brand-new battery? Was my test set-up flawed?
>
>Sam Hoskins
>Murphysboro, IL
>www.samhoskins.blogspot.com
>
Message 4
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| Subject: | Interpreting battery test results |
Sam,
The 8AH capacity of this battery is based on a discharge current rate of
0.4A over a 20 hr period. The chart shows a decrease capacity to 7AH
if
you increase the output current to 0.7A.
As you increase the output current the internal resistance increases
resulting in large internal losses at high current. You can normally
get a
higher output current with less loss from a larger capacity battery,
simply
due to the increased plate area, translating to lower internal
resistance at
a given output current.
Look at Duration of discharge vs. discharge current at Bob's site:
http://www.aeroelectric.com/Reference_Docs/Battery/Panasonic/LC-LA1233P.p
df
At a 1.65A discharge rate for 20 hrs capacity is 33AH. At 105.5A rate
for
0.7hr.the capacity drops to 12.3AH.
This is a Panasonic battery of a different size, but the characteristics
are
similar across the lead acid battery spectrum.
Roger
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Sam
Hoskins
Sent: Thursday, October 23, 2008 7:58 AM
Subject: AeroElectric-List: Interpreting battery test results
I just got hold of a new Oddessey PC310 battery, to use as an endurance
backup. I need to product 12 amps for something like 30-45 minutes. It
is
rated at 8Ah and here is the product information:
http://www.odysseybatteries.com/battery/pc310.htm
Wanting to see what it really had in it, I hooked up the West Mountain
tester. In the test parameters, I called it and 8Ah battery and tried
to
have it run at 12 amps. However, the program didn't like that, so I
stepped
the current draw down to 7 amps. I set the cutoff voltage at 9 volts.
I was surprised the test lasted only 24 minutes, but even more surprised
that the resultant Tested Capacity was only 2.82 Ah.
You can see the test results here:
http://www.mistakeproofing.net/transfer/PC310_10-22-08.pdf
So, why the difference? Shouldn't the Tested Capacity be near 8Ah? Am I
misinterpreting the test results? Is there something wrong with this
brand-new battery? Was my test set-up flawed?
Sam Hoskins
Murphysboro, IL
www.samhoskins.blogspot.com
Message 5
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Very nice,
I'll buy two.
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
Robert L. Nuckolls, III
Sent: Tuesday, October 21, 2008 6:04 PM
Subject: RE: AeroElectric-List: Grounding
<nuckolls.bob@cox.net>
At 02:05 PM 10/21/2008 -0400, you wrote:
>
>Myself as well as many other builders in my area have simply used the B
>& C grounding block. It's a thing of beauty. 48 inside and 24 on the
>firewall. If that doesn't cut it, better to chat with Boeing on that
>SFAR88 thingy.
>
>Kudos to B & C for coming up with a simple but elegant solution to
>grounding.
That's a product we developed here and sold for a time
before turning it over to B&C. We're going to be offering
a panel-ground concentrator block in the near future.
It will look like this:
http://aeroelectric.com/Pictures/Grounding/AVG_RA.jpg
We're looking at a more compact version of the forest-
of-ground-tabs too, but that one is not a done deal
yet.
Message 6
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| Subject: | Re: Interpreting battery test results |
Thanks t all who replied. I now get the picture. Fortunately, I am friends
with the owner of the battery shop and we'll make an adjustment.
Sam
On Thu, Oct 23, 2008 at 8:48 AM, ROGER & JEAN CURTIS <
mrspudandcompany@verizon.net> wrote:
> Sam,
>
>
> The 8AH capacity of this battery is based on a discharge current rate of
> 0.4A over a 20 hr period. The chart shows a decrease capacity to 7AH if
> you increase the output current to 0.7A.
>
>
> As you increase the output current the internal resistance increases
> resulting in large internal losses at high current. You can normally get a
> higher output current with less loss from a larger capacity battery, simply
> due to the increased plate area, translating to lower internal resistance at
> a given output current.
>
>
> Look at Duration of discharge vs. discharge current at Bob's site:
>
>
> http://www.aeroelectric.com/Reference_Docs/Battery/Panasonic/LC-LA1233P.pdf
>
>
> At a 1.65A discharge rate for 20 hrs capacity is *33AH*. At 105.5A rate
> for 0.7hr.the capacity drops to *12.3AH*.
>
>
> This is a Panasonic battery of a different size, but the characteristics
> are similar across the lead acid battery spectrum.
>
>
> Roger
>
>
> -----Original Message-----
> *From:* owner-aeroelectric-list-server@matronics.com [mailto:
> owner-aeroelectric-list-server@matronics.com] *On Behalf Of *Sam Hoskins
> *Sent:* Thursday, October 23, 2008 7:58 AM
> *To:* Aerolectric List
> *Subject:* AeroElectric-List: Interpreting battery test results
>
>
> I just got hold of a new Oddessey PC310 battery, to use as an endurance
> backup. I need to product 12 amps for something like 30-45 minutes. It is
> rated at 8Ah and here is the product information:
> http://www.odysseybatteries.com/battery/pc310.htm
>
> Wanting to see what it really had in it, I hooked up the West Mountain
> tester. In the test parameters, I called it and 8Ah battery and tried to
> have it run at 12 amps. However, the program didn't like that, so I stepped
> the current draw down to 7 amps. I set the cutoff voltage at 9 volts.
>
> I was surprised the test lasted only 24 minutes, but even more surprised
> that the resultant Tested Capacity was only 2.82 Ah.
> You can see the test results here:
> http://www.mistakeproofing.net/transfer/PC310_10-22-08.pdf
>
> So, why the difference? Shouldn't the Tested Capacity be near 8Ah? Am I
> misinterpreting the test results? Is there something wrong with this
> brand-new battery? Was my test set-up flawed?
>
> Sam Hoskins
> Murphysboro, IL
> www.samhoskins.blogspot.com
>
>
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