Samlex Power SCC-30AB Manuel Du Propriétaire page 14

SECTION 3 |
Series – Parallel Connection
PV +
PV -
BAT +
BAT -
Solar Charge Controller
SCC30-AB (rear view)
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.
!
CAUTION!
When 2 or more batteries / battery strings are connected in parallel and are
then connected to a charger (See Fig. 3.3 and 3.4), attention should be paid
to the manner in which the charger is connected to the battery bank. Please
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. 3.3)
or to the Positive battery post of the first battery string (Battery 1 of String 1
in Fig. 3.4), 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. 3.3) or to the Negative Post of the last battery string (Battery 4 of
Battery String 2 as in Fig. 3.4). 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 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. 3.3) or to
the Positive battery post of the first battery string (Battery 1 of String 1 in
Fig. 3.4), and the Negative output cable of the battery charger (Cable "B")
is connected to the Negative battery post of the first battery (Battery 1 as
in Fig. 3.3) or to the Negative Post of the first battery string (Battery 1 of
Battery String 1 as in Fig. 3.4), the following abnormal conditions will result:
14 | SAMLEX AMERICA INC.
Description & Principle of Operation
String 1
Battery 1
Cable "A"
6V Battery
Cable "B"
Fig. 3.4. Series-Parallel Connection
String 2
Battery 2 Battery 3
6V Battery 6V Battery
Battery 4
6V Battery