nuckolls.bob(at)aeroelect
Guest
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 Posted: Tue Jun 14, 2011 5:11 pm Post subject: Current advice on Battery charger/tenders? |
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At 05:55 PM 6/14/2011, you wrote:
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Bob,
I noted your plotted graph for the 1562 style charger.
How important is it for the charger to top off at the 15v before
dropping down to the 13 volt float range...?
I ask because some of the "itty bitty" lower cost units (Harbor
Freight, etc.) appear to slowly bring the charge up to the 13 volt
range and just float there. Thus, skipping the 'top off'
potential. This is referring to standard or sealed aircraft
batteries usage.....
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Doesn't matter which type of lead-acid
technology. They all perform best for
accepting and then holding a charge when
treated thusly.
http://www.aeroelectric.com/Pictures/Curves/Ideal_Recharge_Protocol.jpg
The Schumacher curve I cited earlier looks
something like this. You need to discharge the
battery to 'trigger' a top-off on some chargers.
So if you hook some smart-chargers to a fully
charged battery, they'll drop immediately to a
maintenance potential of just over 13 volts.
A battery cannot be charged at 13 volts . . . since
this is close to the battery's open circuit voltage
at rest. That top-off plateau is important if you're
going to get 100% of what the battery can store
stuffed into it.
Go to this directory and you'll find some exemplar
recharge curves taken from Battery Tenders, Battery
Bob . . .
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