Battery Tender High Frequency On Board Battery Charger 48V @ 10A (PN 022-0170-1) User Instructions - Manual (Page 4)

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Estimated Time to Recharge (Typical Values)
Battery Type: Group 31: 100 Ah Typical 8D: 200 Ah Typical
Charger Output
Current 80%
Complete Optimum Charge
Cycle Complete 80%
Complete Optimum Charge
Cycle Complete
20 Amps 4.0 Hours 12.0 Hours 8.0 Hours 22.0 Hours
15 Amps 5.5 Hours 15.5 Hours 11.0 Hours 29.5 Hours
10 Amps 8.0 Hours 22.0 Hours 16.0 Hours 42.0 Hours
WORKING WITH A DEAD BATTERY OR A BATTERY WITH A VERY
LOW VOLTAGE:
If a 12 Volt, Lead-Acid battery has an output voltage of
less than 9 volts when it is at rest, when it is neither being charged nor
supplying electrical current to an external load, there is a good chance that the
battery is defective. As a frame of reference, a fully charged 12-Volt, Lead-
Acid battery will have a rest-state, no-load voltage of approximately 12.9 volts.
A fully discharged 12-Volt, Lead-Acid battery will have a rest-state, no-load
voltage of approximately 11.4 volts. That means that a voltage change of only
1.5 volts represents the full range of charge 0% to 100% on a 12-Volt, Lead-
Acid battery. Depending on the manufacturer, and the age of the battery, the
specific voltages will vary by a few tenths of a volt, but the 1.5-volt range will
still be a good indicator of the battery charge %.
STATUS INDICATOR LIGHT OPERATION:
INITIALIZATION: WHEN YOU FIRST TURN ON THE AC POWER: All 3
Indicator Lights will Turn On in sequence: Green, then Green & Amber
together, then Green, Amber & Red together for approx 1 second each. Also,
a Safety Monitor Circuit verifies appropriate battery voltage levels and good
electrical continuity between the battery and the charger DC output. Then the
normal battery charging program sequence will begin.
NORMAL INDICATOR LIGHT OPERATING SEQUENCE: 1) Amber Constant
2) Amber Constant and Green Flashing 3) Green Constant.
¾ AMBER (Yellow) Flashing - When the amber light is flashing, the AC
power is applied to the charger and the microprocessor circuitry is
functioning properly. There is no battery connected or there is a problem
with the connections between the charger and the battery.
¾ AMBER (Yellow) - When the amber light is on, the charger is functioning
normally and it is the process of fully charging the battery. The charger
will automatically apply the optimum charging voltage and current values
to the battery in the proper timing sequence.
¾ GREEN Flashing - When the green light is flashing (and the Amber light
is still on), the battery charger is in the absorption mode of operation. In
this mode the charger maintains constant voltage & charge current
decreases to maintenance levels.
¾ GREEN - When the green light is on (and no other lights are on), the
battery is fully charged in the maintenance mode or nearly fully charged in
the equalization mode. Either way, the battery may be used at this time.
¾ RED Flashing - When the red light is flashing, more than 50 hours has
elapsed from the time that the charger AC power was turned and battery
condition still does not allow the initiation of absorption charge.
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APPLICATION / TROUBLESHOOTING INFORMATION:
¾ Always operate the charger in a well ventilated area.
¾ If no indicator lights come on after you plug in the AC cord, then check
the AC power receptacle.
¾ If the AC power is disconnected, the LED indication maybe delayed
several seconds up to 1 minute due to AC filter cap storage state. After
the AC power comes back on, the charger program will reset.
¾ If the green indicator light comes on in less than 2 minutes, check the
battery and the output connections from the charger.
¾ It will take a long time (possibly more than 24 hours, or even 96 hours)
for the green light to come on when charging a large battery or a very
large battery bank. The theoretical maximum time to steady green light
= 127 hours. That would occur when charging a 500 Amp Hour
battery bank with a 10 amp charger.
¾ If the DC charger output connection to the battery is broken while the
charger is operating normally with AC power applied, the Amber light
will begin to flash, and the charger output voltage will be shut off. If
the DC connection to the battery is restored, then the charger program
will reset.
BATTERY CONNECTIONS TO THE CHARGER:
In each case the nominal battery pack voltage must match the charger voltage.
Always exercise caution when connecting the charger to the battery pack.
In the first example, a 36 volt charger is connected to a 36 volt battery pack. One
pack consists of 6 separate 6 volt batteries all connected in series. The other pack
consists of 3 separate 12 volt batteries, all connected in series.
This second example shows a 48 volt charger connected to a 48 volt battery pack.
Three packs are shown: 8 separate 6 volt batteries in series, 4 separate 12 volt
batteries in series, and 6 separate 8 volt batteries in series.
The next example shows a 24
volt charger connected to a 24
volt battery pack.