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4 Freedom SW Owner’s Guide
Introduction
Stacking
Supports stacking of two inverter/chargers to increase capacity. This
also requires the installer to select a Master and Slave in order for
the inverters to stack. Two configurations of stacking are supported:
Parallel stacking and Series stacking.
Parallel Stacking Parallel stacking allows two inverter/chargers
to operate in parallel thereby doubling the capacity in inverter
mode. The two inverters communicate over the network and
intelligently share the load and to balance the load between the two
units. The Master Freedom SW broadcasts pulses on the Xanbus
network to synchronize operation between the other paralleled unit.
When AC loads are present, both units produce power, effectively
sharing the load. When Search mode is enabled, only the Master
unit produces the AC output.
Series Stacking Two units can be configured to generate 120/240
Split-phase power for load configurations that require both 120 and
240 volts. In this configuration, the AC source must be split-phase
as well.
Stack Charging
Two Freedom SWs synchronize charging stages to ensure efficient
charging of the battery bank. When a single unit transitions from
bulk to absorption so do all other units. In absorption, all units must
complete the absorption stage before transitioning to the next stage.
Note that units do not load share when charging except during the
bulk stage. The Freedom SWs stop sharing charge current just
before completing the bulk stage. The units do not share charge
current during the absorption and float stages.
Each unit charges batteries based on the Max Charge Rate setting
and active internal (temperature-based) deratings.
If equalization is enabled on one or more devices capable of
equalization charging, only those devices perform an equalize cycle
after absorption. Other devices transition to float (if three-stage
charging is selected) or transition to AC pass-through (if two-stage
charging is selected).
Generator Assist
The Freedom SW Series of inverter/chargers can operate in tandem
with a generator to temporarily assist power loads with large start-
up demands such as air conditioners, water pumps etc. A Xanbus
AGS must be installed in the system in order for this feature work.
When this mode is enabled and generator capacity defined, the
inverter will come on-line and assist the generator when the
generator reaches its capacity. The battery bank must be well
charged in order for the inverter to engage this mode. For more
details, see “Gen Support” on page 56.
Freedom SW 3K2K InvChg Owners Guide.book Page 4 Thursday, July 31, 2014 1:42 PM