10 | SAMLEX AMERICA INC.
SAMLEX AMERICA INC. | 11
SECTION 3 |
BATTERY THEORY
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.
3.2.3 Series – Parallel Connection
Solar Charge Controller
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. 3.3. Series-Parallel Connection
Figure 3.3 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.
!
CAUTION!
Attention should be paid to the manner in which the charger is connected
to the battery bank. Ensure that if the Positive output cable of the battery
charger (Cable “A”) is connected to the Positive battery post of the first
battery (Battery 1 in Fig. 3.2) or to the Positive battery post of the first battery
string (Battery 1 of String 1 in Fig. 3.3), then the Negative output cable of
the battery charger (Cable “B”) should be connected to the Negative battery
post of the last battery (Battery 4 as in Fig. 3.2) or to the Negative Post of the
last battery string (Battery 4 of Battery String 2 as in Fig. 3.3). This connection
ensures the following:
• The resistances of the interconnecting cables will be balanced.
• All the individual batteries / battery strings will see the same series resistance.
• All the individual batteries will charge at the same charging current and
thus, will be charged to the same state at the same time.
• None of the batteries will see an overcharge condition.
If this is not followed, the following may occur in your system:
• All the individual batteries will be charged at different charging current
and thus, will reach fully charged state at different times.
Summary of Contents for EVO-30AB
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