© 2012 Magnum Energy, Inc.
31
3.0 Setup
Table 3-2, Battery Type to Charge Voltages
Battery
Type
Inverter
Voltage
Absorption
Voltage
Float
Voltage
Equalization
Voltage
GEL
12 VDC
14.1 VDC
13.6 VDC
14.1 VDC
1
24 VDC
28.2 VDC
27.2 VDC
28.2 VDC
1
48 VDC
56.4 VDC
54.4 VDC
56.4 VDC
1
Flooded
12 VDC
14.6 VDC
13.4 VDC
15.5 VDC
24 VDC
29.2 VDC
26.8 VDC
31.0 VDC
48 VDC
58.4 VDC
53.6 VDC
62.0 VDC
AGM 1
2
12 VDC
14.3 VDC
13.1 VDC
15.5 VDC
24 VDC
28.6 VDC
26.2 VDC
31.0 VDC
48 VDC
57.2 VDC
52.4 VDC
62.0 VDC
AGM 2
3
12 VDC
14.5 VDC
13.5 VDC
14.5 VDC
1
24 VDC
29.0 VDC
27.0 VDC
29.0 VDC
1
48 VDC
58.0 VDC
54.0 VDC
58.0 VDC
1
Custom
4
12 VDC
12.0-16.0 VDC 12.0-16.0 VDC
12.0-16.0 VDC
24 VDC
24.0-32.0 VDC 24.0-32.0 VDC
24.0-32.0 VDC
48 VDC
48.0-64.0 VDC 48.0-64.0 VDC
48.0-64.0 VDC
Note¹:
Voltage same as absorption voltage—to prevent equalization.
Note²:
Speci
fi
cations for Concord (Lifeline Series) AGM batteries.
Note³:
Speci
fi
cations for East Penn, Deka, Discover and Trojan AGM batteries.
Note
4
:
When using the Custom setting, the EQ (Equalization) voltage adjust-
ment cannot be set lower than the Absorb Voltage setting. Also, the EQ Voltage
adjustment cannot be set higher than 2 volts (12-volt systems), 4 volts (24-
volt systems), or 8 volts (48-volt systems) above the Absorb Voltage setting.
Example:
The maximum charge rate of your inverter/charger is 120 amps
and you need to limit the charge rate to 72 amps. Choose the
Max Charge =
60%
setting (72 amps = 60% of 120 amps)
.
Info:
If the
Maximum Charge Rate
setting is set to 0%, the topol-
ogy of the Magnum inverter (when connected to an AC source) will
override the 0% setting and start charging if the battery voltage
is: <12 VDC (12-volt models), <22 VDC (24-volt models), or <44
VDC (48-volt models).
How do I determine where to set my Maximum Charge Rate?
The
maximum charge rate is generally set to a C/5
*
rate (C = the total amp-
hour capacity of the battery bank – using the 20-hour AH rate). The C/5 rate
is usually used when the objective is to charge the batteries as quickly as
possible (i.e., 400 AH ÷ 5 = 80 amp maximum charge rate). A lower rate such
as C/20* is used when the batteries need to be charged as slow as possible.
*
C/5 or C/20 rate – charge rates are commonly expressed as a ratio of the total
amp-hour (AH) capacity of the battery bank. For example, with a 400 AH battery
bank (C = 400), the C/5 charge rate is 80 A (400/5 = 80 A).
CAUTION:
The C/5 or C/20 charge rate settings are guidelines.
They are not requirements on how you should set your battery
charge rate. For speci
fi
c charge rate requirements, refer to your
battery manufacturer.
