VANNER
Incorporated
Owners Manual
Max Battery Charger
P
age 9
Owner’s Manual
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4 Battery Charger Operation
4.1 Charger ON/OFF Control
1. There is no ON/OFF switch. Turn the charger ON by connecting the AC input line cord
to a 15 Amp 120 Volt 60Hz power source. Turn the charger OFF by disconnecting AC
power.
2. The charger will not accept AC power above 65Hz or voltage below approx 100 VAC.
4.2 Description of the Three Battery Charging Stages
1. Charging begins when the unit receives 120VAC shore power. In Bulk Stage the
charger output amps will be at full rated output and battery voltage will rise until battery
voltage reaches the models specified voltage. Battery voltage is held by reducing
output current as needed. Bulk Stage ends when charger output current is reduced to
75% of rated output. The charger then shifts to Absorption Stage.
2. Absorption Stage holds battery voltage at the stated bulk rate for 20 minutes. Charger
output current will vary as needed to hold battery voltage constant. After 20 minutes
Absorption Stage ends and Float Stage begins.
3. Float Stage holds the battery voltage at models specified voltage. Charger output
current will vary as needed to hold battery voltage constant. Float Stage ends when
charger output amps reaches full rated output. (In a normal situation the charger will
cycle to Float Stage one time and then remain in Float Stage until disconnected from
AC power.
Please note: DC LOADS may cause the charger to reach full output
which will cause Bulk Stage to restart. The batteries may be damaged due to
overcharging if DC LOADS cause Bulk Stage to restart repeatedly.)
0
5
10
15
20
25
30
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2.5
5
7.5
10
12.5
15
17.5
20
22.5
25
27.5
30
32.5
35
37.5
40
0
10
20
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50
60
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80
90
100
Bulk Mode
Absorption M ode for 20 minutes
Float Mode
75% Rated Current
Time in Minutes
F 3 Figure 4.2-1 Vanner Max Three-Stage Battery Charging Graph
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% Rated Charging Amps
──
Battery
Voltage