Conext SW4048 4,000W 48V Installation

Introduction
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Conext SW to support local loads by converting excess power from external DC
sources connected to its battery bank. Examples of external DC sources are
MPPT solar charge controllers. When local loads demand more energy from the
external DC sources then extra current can be pulled in from the AC source as a
last resort. When operating without a solar charge controller in the system, set
the battery charge cycle to 2StgNoFloat to allow AC Support to function
immediately after the absorption charge stage.
When Conext SW is operating in AC support mode, it only compensates AC
loads which are connected to both phases and having equal power. The
difference in power between the two phases will be drawn from the AC source.
Some scenarios are presented below to reflect this behavior.
Scenario 1
L1 = 3A of AC load,
L2 = 3A of AC load
In this scenario, the Conext SW injects 3A into each phase to offset both loads.
Scenario 2
L1 = 5A of AC load,
L2 = 3A of AC load
In this second scenario where power from the two loads is unequal, the Conext
SW still injects 3A (the lesser of the two AC loads) into each phase. However, the
difference of 2A on L1 shall be drawn from the grid.
AC Support behaves three different ways depending on the type of equipment
that is installed in the Xanbus network with the Conext SW.
• SOC - Xanbus-enabled Conext Battery Monitor is installed
• Enhanced - Xanbus-enabled MPPT solar charge controller is installed
• Regular - neither Xanbus-enabled battery monitor nor MPPT solar charge
controller is installed
AC Support Mode using SOC
With AC support on SOC (AC Supp on SOC) enabled (default setting), Conext SW
maximizes power utilization using stored energy in a battery bank within a grid-
interactive backup power system. AC support mode allows the Conext SW to
accurately determine when grid power can be used to supply energy to the
loads by knowing the state-of-charge (SOC) of the battery bank.
The SOC of a battery bank is monitored by using a Xanbus-enabled battery
monitor. SOC entry and exit points are determined by the user. The SOC entry
point (AC Supp Start Soc) which is a high percentage value determines when
AC support mode is engaged and the SOC exit point (AC Supp Stop Soc) which
is a low percentage value determines when AC support mode is disengaged.
See “AC Support Settings” on page 4–25.