 |
Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
|
| View previous topic :: View next topic |
| Author |
Message |
N6030X(at)DaveMorris.com
Guest
|
 Posted: Mon Feb 12, 2007 10:21 pm Post subject: Battery Tenders as recharging tools . . . |
 |
|
I have a Battery Minder on my Gill G-35 battery now too. Before I
used it, my battery used to hover around 12.2V when the plane was
shut down. I ran the battery nearly dead once trying to start the
engine when the weather had dropped below 30 degrees. After using
the Battery Minder on it for about 3 days, it fired the engine up on
a 25 degree morning in only about 5 blades, and the battery sits at
over 13V when the plane is shut down.
Dave Morris
At 10:35 PM 2/12/2007, you wrote:
| Quote: |
Good data to have. Would be interesting to compare to the Battery
Minder, which is similar in that it charges to around 14V at 1.33
amps, then cuts back to 13.6 to maintain. I've been playing with it
on a 1 yr old CB35A, and a 7 year old CB35A that was dead when I
started. Both now show fully charged electrolyte specific gravity. I
alternate, a few days on each.
Robert L. Nuckolls, III wrote:
>
><nuckollsr(at)cox.net>
>
>As promised, I've finished the first experiment to look
>at the recharge characteristics of a Battery Tender. Take
>a look at:
>
>http://www.aeroelectric.com/Pictures/Curves/Battery_Tender_Recharge_1.jpg
>
>I thought I'd looked at the Battery Tender performance
>some time ago but data taken on this test suggests this is
>the first time . . .
>
>Note that the Battery Tender's 'size' is not a limiting factor
>for putting energy back into a battery. The battery's terminal
>voltage was climbing nicely at a rate commensurate with the
>device's output rating of about 0.8 amps.
>
>The surprise comes when the device switches from a charge to
>sustain mode at just under 14.0 volts! To put this in
>context, look at:
>
>http://www.aeroelectric.com/Pictures/Curves/schumacher_3.jpg
>
>Here we see a predictable rise in voltage as the battery's
>chemistry converts incoming energy into stored chemical energy.
>Note also that the rate-of-rise takes a decidedly upward inflection
>sometime after the voltage climbs past 14.4 volts. This is typical
>of most if not all rechargeable battery chemistries. This
>characteristic is used to send a signal to truly 'smart' chargers
>to announce a nearly full state of charge.
>
>In the case for the Schumacher charger, we see that the profile
>changes from constant current to constant voltage where the
>battery is held in this "top-off" mode for about 2 hours. After
>that time, the charger's output drops to the expected sustaining
>level of about 13.0 volts.
>
>Going back to the Battery Tender, we see that the recharge voltage
>never rises to the inflection point indicating that the battery
>is about full. Further, there's no dwell at some elevated top-off
>voltage.
>
>I'm discharging the battery again to measure how much snort the
>Battery Tender put back into the battery. I'll then recharge it
>again with the Schumacher charger and compare notes again.
>
>This early look-see at the data suggests that admonitions
>against using Battery Tenders as battery chargers is correct.
>The Battery Tender doesn't get the job done based on what
>we know of battery chemistry and the charging profiles
>suggested by other manufacturers. The complaints I'd heard about
>Battery Tenders was that they were "too small" . . . in fact they
>appear to be quite capable with respect to energy output levels.
>Instead, they are deficient in smarts necessary to (1) detect end of
>charge, (2) hold at some elevated top-off level for a reasonable
>length of time followed by (3) drop to a sustaining level that
>doesn't charge the battery and simply offsets the battery's internal
>self discharge currents.
>
>Watch this space . . .
>
>
> Bob . . .
>
> ----------------------------------------
> ( IF one aspires to be "world class", )
> ( what ever you do must be exercised )
> ( EVERY day . . . )
> ( R. L. Nuckolls III )
> ----------------------------------------
>
|
| | - The Matronics AeroElectric-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?AeroElectric-List |
|
|
|
| Back to top |
|
 |
willslau(at)alumni.rice.e
Guest
|
| Posted: Tue Feb 13, 2007 3:57 am Post subject: Battery Tenders as recharging tools . . . |
|
|
Battery Tender has quite a few different models, and the info on their
website indicates that they use different charging algorithms. I could not
find the "021-0123" model number on the Deltran website, but judging by the
0.8A rating, it would be a Battery Tender Jr.. I have a Battery Tender Plus,
which is rated at 1.25A, and uses a different charging algorithm than the
Jr., and the charging profile shown for it on the Deltran Technical Info
page looks a lot more like the curve you got from the Schumacher. I'd be
willing to loan mine out for a test run if you want.
William Slaughter
RV-8
| Quote: | Robert L. Nuckolls, III wrote:
>
><nuckollsr(at)cox.net>
>
>As promised, I've finished the first experiment to look
>at the recharge characteristics of a Battery Tender. Take
>a look at:
>
>http://www.aeroelectric.com/Pictures/Curves/Battery_Tender_Recharge_1.jpg
>jpg
>
>I thought I'd looked at the Battery Tender performance
>some time ago but data taken on this test suggests this is the first
>time . . .
>
>Note that the Battery Tender's 'size' is not a limiting factor for
>putting energy back into a battery. The battery's terminal voltage was
>climbing nicely at a rate commensurate with the device's output rating
>of about 0.8 amps.
>
>The surprise comes when the device switches from a charge to sustain
>mode at just under 14.0 volts! To put this in context, look at:
>
>http://www.aeroelectric.com/Pictures/Curves/schumacher_3.jpg
>
>Here we see a predictable rise in voltage as the battery's chemistry
>converts incoming energy into stored chemical energy. Note also that
>the rate-of-rise takes a decidedly upward inflection sometime after
>the voltage climbs past 14.4 volts. This is typical of most if not all
>rechargeable battery chemistries. This characteristic is used to send
>a signal to truly 'smart' chargers to announce a nearly full state of
>charge.
>
>In the case for the Schumacher charger, we see that the profile
>changes from constant current to constant voltage where the battery is
>held in this "top-off" mode for about 2 hours. After that time, the
>charger's output drops to the expected sustaining level of about 13.0
>volts.
>
>Going back to the Battery Tender, we see that the recharge voltage
>never rises to the inflection point indicating that the battery is
>about full. Further, there's no dwell at some elevated top-off
>voltage.
>
>I'm discharging the battery again to measure how much snort the
>Battery Tender put back into the battery. I'll then recharge it again
>with the Schumacher charger and compare notes again.
>
>This early look-see at the data suggests that admonitions against
>using Battery Tenders as battery chargers is correct. The Battery
>Tender doesn't get the job done based on what we know of battery
>chemistry and the charging profiles suggested by other manufacturers.
>The complaints I'd heard about Battery Tenders was that they were "too
>small" . . . in fact they appear to be quite capable with respect to
>energy output levels. Instead, they are deficient in smarts necessary
>to (1) detect end of charge, (2) hold at some elevated top-off level
>for a reasonable length of time followed by (3) drop to a sustaining
>level that doesn't charge the battery and simply offsets the battery's
>internal self discharge currents.
>
>Watch this space . . .
>
>
> Bob . . .
>
> ----------------------------------------
> ( IF one aspires to be "world class", )
> ( what ever you do must be exercised )
> ( EVERY day . . . )
> ( R. L. Nuckolls III )
> ----------------------------------------
>
|
| | - The Matronics AeroElectric-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?AeroElectric-List |
|
|
|
| Back to top |
|
|
nuckollsr(at)cox.net
Guest
|
| Posted: Tue Feb 13, 2007 5:12 am Post subject: Battery Tenders as recharging tools . . . |
|
|
At 09:35 PM 2/12/2007 -0700, you wrote:
| Quote: |
Good data to have. Would be interesting to compare to the Battery Minder,
which is similar in that it charges to around 14V at 1.33 amps, then cuts
back to 13.6 to maintain. I've been playing with it on a 1 yr old CB35A,
and a 7 year old CB35A that was dead when I started. Both now show fully
charged electrolyte specific gravity. I alternate, a few days on each.
|
You can hook batteries in parallel for charging and
maintaining. I've had as many as three different sized
batteries on my BTJrs and they all seem to live quite
happily. The batteries respond to terminal voltage and
are individually oblivious to how many other batteries
may be sharing the charger's attention.
Bob . . .
| | - The Matronics AeroElectric-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?AeroElectric-List |
|
|
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
