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GENERAL INFORMATION: BATTERIEs
Negative terminal of Battery 3 is connected to the Positive terminal of Battery 2. The
Negative terminal of Battery 2 is connected to the Positive terminal of Battery 1. The
Negative terminal of Battery 1 becomes the Negative terminal of the 24V battery
bank.
Parallel Connection
Solar Charge Controller
SCC30-AB (rear view)
PV +
PV -
BAT +
BAT -
12V Battery 12V Battery 12V Battery 12V Battery
Battery 1 Battery 3 Battery 2 Battery 4
Cable “A”
Cable “B”
Fig. 3.3. Parallel Connection
When two or more batteries are connected in parallel, their voltage remains the same
but their Ah capacities add up. Fig. 3.3 above shows 4 pieces of 12V, 100 Ah batteries
connected in parallel to form a battery bank of 12V with a capacity of 400 Ah. The
four Positive terminals of Batteries 1 to 4 are paralleled (connected together) and this
common Positive connection becomes the Positive terminal of the 12V bank. Similarly,
the four Negative terminals of Batteries 1 to 4 are paralleled (connected together)
and this common Negative connection becomes the Negative terminal of the 12V
battery bank.
Series – Parallel Connection
Solar Charge Controller
SCC30-AB (rear view)
PV +
PV -
BAT +
BAT -
6V Battery 6V Battery 6V Battery 6V Battery
String 1 String 2
Battery 1 Battery 3 Battery 2 Battery 4
Cable “A”
Cable “B”
Fig. 3.4. Series-Parallel Connection
Figure 3.4 above shows a series – parallel connection consisting of four 6V, 200 Ah
batteries to form a 12V, 400 Ah battery bank. Two 6V, 200 Ah batteries, Batteries 1
and 2 are connected in series to form a 12V, 200 Ah battery (String 1). Similarly, two
6V, 200 Ah batteries, Batteries 3 and 4 are connected in series to form a 12V, 200 Ah
battery (String 2). These two 12V, 200 Ah Strings 1 and 2 are connected in parallel to
form a 12V, 400 Ah bank.