Xantrex Technology 815-2524-02 User Manual

50

Freedom SW 230V Installation Guide

Stacking Features

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 600Ah should not be charged 
beyond 25% of its capacity (150A). Therefore, when configuring 
the two stacked Freedom SW chargers, each charger may have a 
maximum charger output current of 75A (that is, 600 × 25% × 

1

/

2

) 

into the common battery bank as described in the Calculations 
section. Also, the System Total BULK output current is calculated 
as 150A (that is, 75A + 75A).

To set the Max Chg Rate (%) setting in each Freedom SW 3524-230:

1.

Divide the maximum allowable charger output current of 75A 
by the Freedom SW 3524-230’s maximum charge capacity of 
90A.

So, 75 ÷ 90, gets an approximate value of 0.83 (or 83%) which 
can be set exactly to 83%.

2.

Set the Max Chg Rate (%) setting to 83 which means 83%.

In this example, the actual output current is limited to 83% of 90A 
which is 74A. Therefore, the actual System Total BULK output 
current comes out to just under 150A.

Freedom SW 3K2K 230V InvChg Install Guide.book  Page 50  Friday, June 20, 2014  9:11 AM