©2013 Magnum Energy, Inc.
9
3.0 Setup
Table 3-2, Battery Size to Battery Amp-Hours (estimated)
Group/
Code Size
Physical Size
(L” x W” X H”)
Battery
Voltage
Battery AHrs
(20 hour rate)
GC-2 (Golf Cart)
10
3/8
x 7
13/16
x 10
5/8
6V
220 AHrs
L16
11
11/16
x 7 x 16
11/16
6V
375 AHrs
Group 22
9
1/2
x 6
7/8
x 8
5/16
12V
55 AHrs
Group 24
10
1/4
x 6
13/16
x 8
7/8
12V
70 AHrs
Group 27
12
1/16
x 6
13/16
x 8
7/8
12V
95 AHrs
Group 31
13 x 6
13/16
x 9
7/16
12V
110 AHrs
4D
20
3/4
x 8
3/4
x 9
7/8
12V
200 AHrs
8D
20
3/4
x 11
1/8
x 9
7/8
12V
225 AHrs
Once you’ve determined the AH capacity of each battery, review how your
batteries are connected (parallel or series) to determine the total amp-hour
capacity of the battery bank.
Parallel connection
When batteries are connected in parallel (positive to positive, negative to
negative) they increase the amp-hour capacity of the battery bank, but the
voltage remains the same.
Example:
You have a 12-volt battery bank with three 12-volt batteries
that are rated at 125 amp-hours (AH) each. Each of the positive terminals
are connected together and each of the negative terminals are connected
together, which means they are connected in parallel. The amp-hours of
each battery connected in parallel are added together (125 AH + 125 AH
+ 125 AH = 375 AH), but the voltage of the battery bank stays the same
(12 VDC).
Series connection
When batteries are connected in series (positive to negative) they increase
the voltage of the battery bank, but the amp-hour rate remains the same.
Example:
You have a 12-volt battery bank with two 6-volt batteries
that are rated at 220 amp-hours (AH) each. The positive terminal of
the
fi
rst battery is connected to the negative terminal of the second
battery, which means these batteries are connected in series. Since the
two 6-volt batteries are connected in series, the voltage of the batteries
are added together to produce 12-volts (6 VDC + 6 VDC = 12 VDC), but
the amp-hour capacity of the battery bank does not change (220 AH).
In battery banks where you have batteries connected in series and in parallel
—the rules are the same. The batteries connected in series are referred to
as a “series string” and the amp-hour capacity doesn’t change. Each series
string is connected together in parallel to increase the amp-hour capacity.
Add the amp-hour capacity of each series string connected in parallel to
determine the total amp-hour capacity of the battery bank.
