Samlexpower SAM-1500C-12, Руководство пользователя

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18 | SAMLEX AMERICA INC.
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.
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
An example of this calculation for a 12V inverter is given below:
Let us say that the total continuous ac Watts delivered by the 12V inverter = 1500W.
Then, using Formula 2 above, the DC current to be delivered by the 12V batteries =
1500W ÷10 = 150 Amperes.
next, the energy required by the load in ampere Hours (ah) is determined:
For example, if the load is to operate for 3 Hours, then as per Formula 3 above, the energy
to be delivered by the 12V batteries = 150 Amperes × 3 Hours = 450 Ampere Hours (Ah).
finally, as per rule of thumb at formula 4, the ah capacity of the batteries should be
twice the energy required by the load in ah = 450 Ah x 2 = 900 Ah.
SECTION 4 | Installation