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nuckolls.bob(at)aeroelect
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 Posted: Tue Sep 25, 2012 9:11 am Post subject: Good news . . . and bad news |
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I picked up the latest version of Schumacher's SEC1562
charger at Wallyworld last week. Got it on a site-to-store
free of shipping charges for about $21.
The first plot for a charge cycle demonstrated the highly
recommended bulk charge ramp capped off with an absorption
charge plateau.
http://tinyurl.com/9s7kpww
I did a series of charge discharge cycles alternating between
the 1562 and my 10+ year old Battery Tender. Wasn't paying
much attention to details of the data. Each test cycle
took 14+ hours.
When I merged the data on to a common plot, it became obvious
that the test battery, while relatively young, was incapable
of delivering closely matched pairs of charge/discharge cycle.
Normally, one expects a new SVLA battery to be good for
several dozen deep discharges before demonstrated capacity
begins to fall. Not so with the test article I've been
using.
Test results:
I'm unable to resolve the difference between recharge
performance of the 1562 versus the BT. Both chargers
seem to put about as much snort into the battery but
any real differences are buried in the uncertainties
generated by the degrading battery.
I can confidently assert that the SEM51562 is still
an exceptional value. It now features 6/12 auto-switching,
it charges at a rate about 2x that of the Battery
Tender. I see that the BT Jr sells on Ebay for about $25
with free shipping, so cost differential has dropped markedly
over the past few years.
Conclusion:
I cannot claim that one device is superior to the other
based on measurements. The recharge voltage profiles
for the BT are markedly shy of the idealized profiles
cited by industry. Just how much difference it makes
remains unmeasured.
Using a chemical conversation system as a 'transfer
standard' for evaluation of charger performance is
fraught with risk . . . which rose up and bit me.
Anywho, I've got a shiny new 1562 that's going out
to the wood shop to maintain some batteries I have
stored out there. Next time I get my hands on a fresh,
mid-sized SLVA battery, I'll try again. Don't throw
out your Battery Tenders! I'm keeping all three of
mine.
Bob . . .
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skywagon
Joined: 11 Feb 2006
Posts: 184
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| Posted: Thu Sep 27, 2012 2:35 pm Post subject: Good news . . . and bad news |
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Bob,
The graph did not show V and A legends on the pic that you included.
The 1562 that I recently purchased and put on a standard open cell 12v auto
battery had the following.
I monitored the batt. voltage with a DVM. The max chg. voltage went to just
under 14.1 v.
The stabilized float voltage was just under 13.1 v.
Does this seem about what you viewed on your tests...??
Dave
____________________________________________________________
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nuckolls.bob(at)aeroelect
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| Posted: Fri Sep 28, 2012 9:44 am Post subject: Good news . . . and bad news |
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At 05:33 PM 9/27/2012, you wrote:
| Quote: |
Bob,
The graph did not show V and A legends on the pic that you included.
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Not sure which one you're referring to. I think this is the
plot I originally published.
http://tinyurl.com/d8yc8rw
| Quote: | The 1562 that I recently purchased and put on a standard open cell
12v auto battery had the following.
I monitored the batt. voltage with a DVM. The max chg. voltage went
to just under 14.1 v.
The stabilized float voltage was just under 13.1 v.
Does this seem about what you viewed on your tests...??
|
I need to spend some time building an interface for
one of the DAS modules I've acquired . . . to plot
both battery current and voltage. This will let me
do an integration by parts summation of watt-seconds
IN versus watt-seconds OUT.
By the way, I just became aware of a product from
Dataq
http://tinyurl.com/93obako
Price is hard to beat! One would need an instrumentation
amplifier to read current shunts . . . but the AD628 makes
that really simple. Just need a 36-hour day . . .
Bob . . .
Bob . . .
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LynnCole(at)foxvalley.net
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| Posted: Sat Sep 29, 2012 7:22 am Post subject: Good news . . . and bad news |
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Hi Bob, | Quote: | Price is hard to beat! One would need an instrumentation
amplifier to read current shunts . . . but the AD628 makes
that really simple. Just need a 36-hour day . . .
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I have two partial solutions to your dilemma of a 36-hour day.  Unfortunately nobody I have talked to likes my ideas:
(1) This idea is made obsolete by modern electronic clocks and watches. Design a pair of elliptical gears into your clock so that the hour hand goes zipping around during the night-time hours of 10 pm until 6 am, but it moves slooowly during the day-time hours of 6 am until 10 pm.
(2) Noting that there are 168 hours in a week (7 days times 24 hours per day), rearrange the week to have 6 days of 28 hours, each. The week would still be 168 hours long, but each day would have an extra block of 4 hours that you could use however you wish.
Just a thought...
-----
Lynn Cole
LynnCole(at)foxvalley.net (LynnCole(at)foxvalley.net)
[quote][b]
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mrspudandcompany(at)veriz
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| Posted: Sat Sep 29, 2012 8:28 am Post subject: Good news . . . and bad news |
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Hi Bob, | Quote: |
Price is hard to beat! One would need an instrumentation
amplifier to read current shunts . . . but the AD628 makes
that really simple. Just need a 36-hour day . . . |
I have two partial solutions to your dilemma of a 36-hour day. Unfortunately nobody I have talked to likes my ideas:
(1) This idea is made obsolete by modern electronic clocks and watches. Design a pair of elliptical gears into your clock so that the hour hand goes zipping around during the night-time hours of 10 pm until 6 am, but it moves slooowly during the day-time hours of 6 am until 10 pm.
(2) Noting that there are 168 hours in a week (7 days times 24 hours per day), rearrange the week to have 6 days of 28 hours, each. The week would still be 168 hours long, but each day would have an extra block of 4 hours that you could use however you wish.
Just a thought...
[quote] Lynn, Please don’t let this get out!!! Especially to “Highly intelligent politicians”, at least in their own mind. These overpaid representatives of the people will try to find a way to implement it. ☺ Roger Do not archive [b]
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nuckolls.bob(at)aeroelect
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wtmills
Joined: 05 Feb 2007
Posts: 32
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| Posted: Sun Sep 30, 2012 7:25 am Post subject: Good news . . . and bad news |
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Let me know when this gets sorted out - I'm still trying to come to terms with the "buttered-cat array".
On Sat, Sep 29, 2012 at 12:15 PM, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
[quote]--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)>
At 10:21 AM 9/29/2012, you wrote:
| Quote: | Hi Bob,
| Quote: | Price is hard to beat! One would need an instrumentation
amplifier to read current shunts . . . but the AD628 makes
that really simple. Just need a 36-hour day . . .
|
I have two partial solutions to your dilemma of a 36-hour day. Unfortunately nobody I have talked to likes my ideas:
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I'll bet you could get a patent on it . . . the
patent office is exceedingly accepting of ideas
irrespective of efficacy or merchantability.
But having a patent preserves the idea
in perpetuity!
Bob . . .
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[b]
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