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nuckolls.bob(at)aeroelect
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 Posted: Thu Dec 09, 2010 11:04 am Post subject: Odyssey type batteries require a special type of charger? |
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At 10:48 AM 12/9/2010, you wrote:
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From ODYSSEY's site:
http://www.odysseybattery.com/documents/US-ODY-OM-008_1010.pdf
Also I note that the charges they sell use 3 sequential charge
currents. This may be of use in the Deep cycle application and of
course your alternator does not know if you have an ODYSSEY or a
Sears & Robuck battery. I cant imagine it would not get a complete
charge after a few hours with 14 VDC on it.
Tim Andres
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Right on. The Internet driven dispersal of
floobydust about SVLA battery charging has been
waxing and waning for at least ten years.
Bottom line is that EVERY manufacturer of battery
has good reason to recommend/discourage a battery
charging philosophy . . . but for reasons that
are usually not known to us and is probably
irrelevant.
The folks at the factory may have conducted many
detailed studies with a goal of knowing (1) how
their product performs and (2) how to make that
performance stand a tad taller than the competition.
As Tim noted, once you bolt the battery to your
airplane, ALL bets for achieving the greatest
possible service life are off. This is because
the probability that any given battery is asked
to perform in laboratory conditions is zero.
The problem is further compounded when folks who
sell batteries mix decades of ol' mechanics lore
with ideas taken from the new supplier's 4-color
brochures. Mix the 'right' ingredients and clouds
of floobydust explode.
There is no such thing as a modern "trickle" charger
which is, by definition, a small but CONSTANT
CURRENT charger. Trickle chargers are mildly abusive
of a flooded battery ('cause you can put in more
water) and poison to an SVLA battery ('cause you
can't put in more water).
Many small chargers (1/2 amp to perhaps 2 amps
capability) are often mis-identified as "trickle
chargers" based only on their electrical size.
In fact, I'm aware of NO modern product at any
price that does not go into some form of constant
SUSTAINING voltage after spending some time at
a bulk charge or TOP-OFF voltage. These are BATTERY
MAINTAINERS. The least expensive device at WalMart are
entirely suitable for charging/maintaining any
brand/size of SVLA battery.
http://www.aeroelectric.com/Pictures/Curves/Ideal_Recharge_Protocol.jpg
How close do the market place chargers come to meeting
the "ideal recharge protocol"?
http://www.aeroelectric.com/Pictures/Curves/Battery_Minder_Recharge.pdf
http://www.aeroelectric.com/Pictures/Curves/Battery_Tender_Recharge.pdf
http://www.aeroelectric.com/Pictures/Curves/schumacher_2.jpg
http://www.aeroelectric.com/Pictures/Curves/schumacher_3.jpg
http://www.aeroelectric.com/Pictures/Curves/schumacher_4.jpg
http://www.aeroelectric.com/Pictures/Curves/schumacher_5.jpg
http://www.aeroelectric.com/Pictures/Curves/schumacher_6.jpg
Not many.
How much difference will it make in the demonstrated
service life in YOUR airplane. Not much.
Check out the offerings of Professor Battery
(Isador Buchmann) at . . .
http://batteryuniversity.com/learn
Finally, exhortations for application or black-
listing of any modern product as a battery charger
need to be filtered integrity of the physics and/or
relevance in your proposed application.
As Tim noted, your alternator/regulator combo
doesn't read Battery Digest.
Bob . . .
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ftyoder(at)yoderbuilt.com
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| Posted: Thu Dec 09, 2010 7:41 pm Post subject: Odyssey type batteries require a special type of charger? |
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What kind of Alternator do you get that produces 3 sequential charge
currents for the Odyssey?
Well, I thought it was funny.
Tim
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Fri Dec 10, 2010 5:24 am Post subject: Odyssey type batteries require a special type of charger? |
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Actually most chargers will reduce the amount of current being fed to the
battery as the battery accepts charge. In effect as the battery accepts a
charge it becomes a large resistor to the current feeding it. The only
thing the three step charge does is lower the input requirements for the
charger.
This is why when you put a discharged battery on to charge it draws maximum
current and when the battery is close to full charged the current is
minimal. It is possible for chargers when they come to the end of a charge
cycle to increase the voltage fed to the battery causing the battery to boil
dry.
Noel
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