SamplexPower SAM Series, Owner'S Manual

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SAMLEX AMERICA INC. | 21
SeCTIOn 4 | Installation
nected to the battery bank. Please ensure that if the Positive output cable of
the Inverter Charger (Cable “A”) is connected to the Positive battery post of the
first battery (Battery 1 in Fig. 4.3) or to the Positive battery post of the first bat
-
tery string (Battery 1 of String 1 in Fig. 4.4), then the Negative output cable of
the Inverter Charger (Cable “B”) should be connected to the Negative battery
post of the last battery (Battery 4 as in Fig. 4.3) or to the Negative Post of the
last battery string (Battery 4 of Battery String 2 as in Fig. 4.4). 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 Inverter Charger (Cable “A”) is connected to
the Positive battery post of the first battery (Battery 1 in Fig. 4.3) or to the Posi
-
tive battery post of the first battery string (Battery 1 of String 1 in Fig. 4.4), and
the Negative output cable of the Inverter Charger (Cable “B”) is connected to
the Negative battery post of the first battery (Battery 1 as in Fig. 4.3) or to the
Negative Post of the first battery string (Battery 1 of Battery String 1 as in Fig.
4.4), the following abnormal conditions will result:
• The resistances of the connecting cables will not be balanced.
• The individual batteries will see different series resistances.
• All the individual batteries will be charged at different charging current and
thus, will reach fully charged state at different times.
• The battery with lower series resistance will take shorter time to charge as
compared to the battery which sees higher series resistance and hence, will
experience over charging and its life will be reduced.
4.6.9 Sizing inverter Battery Bank
The following basic rules are used to determine the size of the battery bank:
• Active Power in Watts (W) =
Voltage in Volts (V) x Current in Amperes (A) x Power Factor
............. formula 1
• For an Inverter running from a 12V battery system,
the DC current required from the 12V batteries is the
AC power delivered by the inverter to the load in Watts (W)
divided by 10 ............................................................................................ formula 2
• Energy required from the battery =
DC current to be delivered (A) x time in Hours (H)
............................... formula 3
• As a Rule of Thumb, Ah capacity of the batteries required =
2 x Energy required from the battery
.................................................... formula 4