nuckolls.bob(at)aeroelect
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 Posted: Mon Mar 29, 2010 4:43 am Post subject: Voltage measurements for Schumacher 1562A |
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At 05:34 PM 3/28/2010, you wrote:
| Quote: | I too checked out the Schumacher 1562A, new version.
I have a PC680 in my plane. I flew for 2.6 hours last Sunday and did
not put the charger/maintainer on.
Today when I got the airport I first checked the voltage of the
battery. 12.83 VDC. All readings were taken at the battery
terminals. Next I fired up the 1562A. Initial voltage was 14.2, then
very quickly up to 14.9. After about a minute the voltage
stabilized at 14.88 VDC.
Half hour later 14.86 to 14.87 VDC.
Hour one 14.83 to 14.84 VDC.
Hour two. Finally reached float at 13.4 to 13.5 VDC.
Hour three 13.45 VDC.
Test concluded. It appears to my untrained eye that the unit is
functioning properly.
Bob, please let me know if my assumptions are correct or incorrect.
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I think you're correct.
Keep in mind that the art and science of battery
maintaining goes to very long term storage of
batteries where the goal is to supply an EXTERNAL
source of energy that offsets internal leakage
that will ultimately discharge the battery if
left unattended.
In the case of an SLVA battery, this self-discharge
current is quite low. So the routine application of
a maintainer between flights during the flying season
is probably of no great benefit.
Keep in mind too that the devices we're discussing
are also capable of recharging a battery. While not
robust, none of the charger maintainers would be
hard pressed to get a 10% battery back to 100% in
24 to 36 hours.
Any time a battery is recharged, terminal voltage
of the battery right after removal of charge
current will be much higher than the ULTIMATE
OPEN CIRCUIT voltage of just under 13.0 volts
at room temperature. In may take many hours for
this so called "surface charge" to bleed off
such that a maintainer can settle into the
task of long term storage duties.
I think the critical review of a charger/
maintainer is to see that it does conduct a
reasonable charge-top off cycle that doesn't
go much above 15 volts nor less than 14 volts.
The TIME it spends in the top-off mode will
be a function of how deeply discharged the
battery was when the charger/maintainer was
connected and exactly where in the 14-15 volt
range it decides to operate.
But at some time consistent with recharging
duties, it does drop out of the charge/top-off
mode. The system voltage may not drop to the
ultimate maintenance level for many hours. So
once your charger says "I'm done", come back
a day later to see what the maintenance voltage
is. It should be 13.0 to 13.5 volts.
Bob . . .
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