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51
Stacking Features
This guide for use by qualified installers only.
Charger Settings in a Dual Freedom SW Configuration
The Freedom SW 3524-230 includes a maximum 90A
charger. When using two stacked Freedom SW 3524-230
inverter/chargers connected to the
same battery bank,
a total
of 180A (90A
x
2) of bulk charging is possible into that single
common battery bank. For small battery banks and/or certain
battery types this bulk mode current may be too high,
therefore Freedom SW 230V models include a battery bank
capacity
(
Batt Capacity
)
setting and a maximum charge
rate (%) (
Max Chg Rate
) setting.
The battery bank capacity (
C
) is the bank’s total Amp-hour
capacity, which is best determined by a qualified RV electrical
technician.
The
Max Chg Rate
depends on the battery manufacturer's
maximum charge rate for the specific battery model being
used to construct the bank. This total bank maximum charge
rate is best determined by a qualified RV electrical technician.
Suitable battery types include Flooded, GEL and AGM. Do
not mix different battery types within the same battery bank.
For a Flooded type battery bank, the
preferred
charge rate (in
Amps) is usually 10-15% of
C
where
C
= battery bank’s total
Amp-hour capacity. However, the industry-accepted
maximum
charge rate is 25% of
C
. Some AGM or Gel battery
models may have a
maximum
charge rate as high as 50% of
C
and in rare cases, up to 100% of
C
.
Do not exceed the battery manufacturer’s recommended
maximum charge specifications because the resulting battery
temperature rise shortens battery life.
Calculations
Once installed and configured, each Freedom SW 230V
charger in the dual configuration should be set to its own bulk
charge current limit as follows:
Industry accepted
maximum
charge rate (%)
x
battery bank’s total Amp-hour capacity (
C
)
x
1
/
2
(for one of the chargers)
=
Maximum
charger #1
output current
(in Amps)
allowed in bulk mode (also limited to the charger’s
maximum capacity)
FSW 230V Installation Guide.book Page 51 Tuesday, August 7, 2018 9:18 AM