21
20
User Manual
4
CHARGING AND
EQUALIZING
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
0
2
4
6
8
10
12
14
16
18
20
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Charge V
oltae (volts per cell)
Charge Current (Amps as % of C/20
Ah)
Charge Time (Hours)
US Battery Recommended Charge Profile
2-Stage
(Constant Current - Constant Voltage)
Equalization Charge Current
Charge Voltage
Equalization Charge Voltage
Stage 1
Stage 2
Charge Current
Bulk Charge
(Constant Current
@
~
10% of C/20Ah)
w/ Max. Voltage and/or
- V termination
Absorption Charge
(Constant Voltage
@2.45+/-0.05 vpc)
w/ Maximum Time
Termination at 2-3
hours after Current of
≤
3% of
C/20 Ah is
Reached
Equalization
Charge
(Constant Voltage)
(1-3 Hours)
(
~
Every 30 cycles)
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
0
2
4
6
8
10
12
14
16
18
20
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Charge V
oltae (volts per cell)
Charge Current (Amps as % of C/20
Ah)
Charge Time (Hours)
US Battery Recommended Charge Profile
3-Stage
(Constant Current - Constant Voltage - Constant Current)
Equalization Charge Current
Charge Voltage
Equalization Charge Voltage
Stage 1
Stage 2
Stage 3
Charge Current
Bulk
Charge
(Constant Current
@
~
10% of C/20Ah)
w/ Max. Voltage and/or
- V termination
Absorption
Charge
(Constant Voltage
@2.40+/-0.05 vpc)
w/ Min. Current and/or
dV/dt Termination
Equalization
Charge
(Constant Voltage)
(1-3 Hours)
(
~
Every 30 cycles)
Finish
Charge
(Constant
Current
@
~
3% of
C/20Ah)
w/ dV/dt
Charge
Termination
FLOODED LEAD ACID 3-STAGE CHARGING
FLOODED LEAD ACID 2-STAGE CHARGING
DIAGRAM 5
DIAGRAM 6
TABLE 4:
Example of voltage settings for deep-cycle flooded lead acid batteries using a 2-stage
charger
2-Stage Charger Settings for Deep-Cycle Flooded/Wet Batteries
System Voltage
6 Volt
8 Volt
12 Volt
24 Volt
36 Volt
48 Volt
Bulk Charge
Voltage
7.05 - 7.5
9.4 - 10
14.1 - 15
28.2 - 30
42.3 - 45
56.4 - 60
Absorption
Charge Voltage
7.05 - 7.5
9.4 - 10
14.1 - 15
28.2 - 30
42.3 - 45
56.4 - 60
Absorption
Time
2-4 hours
Float Voltage
6.51
8.68
13.02
26.04
39.06
52.08
Equalization
Voltage
7.5 - 7.8 10.0 - 10.4 15.0 - 15.6 30.0 - 31.2 45.0 - 46.8 60.0 - 62.4
Equalization
Time
2-4 hours
Equalization
Frequency
At least once a month; Every two weeks if cycled daily.
• AGM CHARGING RECOMMENDATIONS
Three-Stage Charger (Constant Current-Constant Voltage-Constant/Pulse Current)*
Following is the chargeing recommendations and charging profile using 3 stage* chargers for US
AGM deep cycle products.
*
Equalization and float charge modes are not considered to be one of the stages in a charge profile.
1. Bulk Charge
Constant current @ maximum bulk charge to 2.40+/-0.05 volts per cell
(e.g. 7.20 volts +/-0.15 volts per 6 volt battery)
2. Absorption Charge
Constant voltage (2.40+/-0.05 vpc) to minimum absorption charge then hold for 2-3
hours
and
terminate
charge.
3. Finish Charge
Constant curent at 3% of C/20 Ah to 2.45+/-0.05 volts per cell then terminate charge
(e.g. 7.35 volts +/-0.15 volts per 6 volt battery)
Pulse finish:
Periodic short current pulses at ~2% of C/20. Voltage rises to 2.7vpc,
current turns off, voltage drops to 2.35vpc, current turns on and repeats. Termination
is determined by % overcharge or max time.
•
(Optional Float Charge) Constant voltage 2.23+/-0.03 vpc (6.70 volts per 6 volt battery) for unlimited time
•
Equalization Charge
Constant voltage (2.45+/-0.05 vpc) extended for 1-3 hours after normal charge
cycle (repeat every 30 days)
Notes:
Charge time from full discharge is 9-12 hours.
Absorption charge time is determined by the battery but will usually be ˜3 hours at 2.40 volts per cell.
