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975-0697-01-01 49
Stacking Features
This guide for use by qualified personnel only.
Example 2: System composed of two stacked Freedom SW 3524-
230s. Each Freedom SW 3524-230 has a maximum charge capacity
of 90A
. The two stacked Freedom SW 3524-230 inverter/chargers
connected to the same battery bank can possibly produce a total of
180A.
The industry’s commonly accepted practice suggests a typical
Flooded battery bank capacity (
C
) of 400Ah should not be charged
beyond 25% of its capacity (100A). Therefore, when configuring the
two stacked Freedom SW chargers, each charger may have a
maximum
allowable charger output current of 50A (400 × 25% ×
1
/
2
)
into the common battery bank as described in the Calculations
section. Also, the System Total BULK
output current
is calculated
as 100A (50A + 50A).
To set the
Max Chg Rate
(%) setting in each Freedom SW 3524-230:
1. Divide the
maximum
allowable charger output current of 50A by
the
Freedom SW 3524-230’s maximum charge capacity of 90A.
So, 50 ÷ 90, gets an approximate value of 0.56 (or 56%) which
can be roughly reduced to 55%.
2. Set the Max Chg Rate (%) setting to 55 which means 55%.
In this example, the actual output current is limited to 55% of 90A
which is 49A. Therefore, the actual System Total BULK output
current comes out just under 100A.
Example 3:
System composed of two stacked Freedom SW 3524-230s.
Each Freedom SW 3524-230 has a maximum charge capacity of 90A
. The
two stacked Freedom SW 3524-230 inverter/chargers connected to the
same battery bank
can possibly produce a total of 180A.
The industry’s commonly accepted practice suggests a typical
Flooded battery bank capacity (C) of 1000Ah
should not be charged
beyond 25% of its capacity (250A). Therefore, when configuring
the two stacked Freedom SW chargers, each charger may have a
maximum charger output current of 125A
(that is, 1000 × 25% ×
1
/
2
)
into the common battery bank as described in the Calculations
section. Also, the System Total BULK output current is calculated
as 250A (that is, 125A + 125A).
To set the
Max Chg Rate
(%) setting in each
Freedom SW 3524-230:
1. Divide the maximum allowable charger output current of 125A
by the
Freedom SW 3524-230’s maximum charge capacity of
90A
.
So, 125 ÷ 90, gets an approximate value of 1.39 (or 139%)
which means that even when the charger is operating at 100%
full power, the battery bank can more than adequately accept
the current the charger is delivering.
2. Set the Max Chg Rate (%) setting to 100 which means 100%.
There is no setting beyond 100%.
In this example, the actual output current is limited to 100% of 90A
which is 90A. Therefore, the actual System Total BULK output
current comes out to 180A.
Freedom SW 3K2K 230V InvChg Install Guide.book Page 49 Friday, June 20, 2014 9:11 AM