Multi-Unit Operation - Conext XW+ 6848 NA Owner's Manual

Further details about AC Coupling can be found in the document AC Coupling of
Inverters Solutions Guide (975-0240-01-01) available at http://solar.schneider-
electric.com.

Multi-unit Operation

Up to three Conext XW+ units can be installed together in a single phase configuration
with the Conext PDP (Power Distribution Panel). A maximum of four Conext XW+ units
can be installed together in a single phase configuration with the addition of a second
PDP. The PDP is an ideal optional companion for managing AC connections and
integrating a battery bank and other DC connections. Regardless of how it is installed,
the maximum number of Conext XW+ in a single phase or split phase configuration is
four.
Three Conext XW+ units can also be configured in a cluster for three-phase operation
using a single PDP (PDP is optional). Up to three clusters of three Conext XW+ units
can be installed in a three-phase configuration when using an external AC contactor.
Multiple Conext XW+ units and other Xanbus devices with common connections to
battery banks, PV arrays, the utility grid or a generator require programming during
commissioning to enable correct operation.
Inverting
For multiple units, the master Conext XW+ synchronizes operation of other connected
units using the same Xanbus network. When AC loads are present, all units produce
power, effectively sharing the load. Multiple units do not produce power together when
Search mode is enabled. See "Using Search Mode" on page 3–9.
Parallel Charging
Multiple Conext XW+ units on the same Xanbus network synchronize their charging
stages to help provide 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 any of them transition to the next stage. Note that
units stop sharing charge current just before completing the bulk stage and only share
charging load during the bulk stage.
Each Conext XW+ unit provides a maximum charging current set by the Max Charge
Rate setting. The maximum current may be decreased, subject to the internal operating
temperature.
When one or more Conext Solar Charge Controllers are installed and operating in the
system, Conext XW+ units synchronize only their bulk charging stage with the charge
controllers.
Note: Equalization is device specific. Only the device(s) on which equalization was
initiated will perform the equalization. Other devices will stay in float or no-float
depending on their settings.
975-0240-01-01
Operation
1–9