Conext SW4048 4,000W 48V Installation

Introduction
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The feature also ensures that self-consumption of harvested solar energy is
optimized. The 2-hour delay works only under the following conditions:
• Conext SW’s battery charge cycle must be set to 2StgNoFloat
• PLSDelay must be set to Enabled
• an MPPT solar charge controller must be connected and detected in the
Xanbus network
• the feature must not have been activated within that day
This configuration can be enabled or disabled in “Advanced Features Menu” on
page 4–36. The default setting for PLSDelay is Disabled.
AC Coupling
Off-grid AC Coupled system architecture is often used to create a stand-alone
grid. Commonly this means that PV inverters are connected to the output of a
battery-based inverter/charger putting both on the same AC bus along with the
AC loads. In this scenario, the battery powered inverter charger provides the
necessary frequency and voltage to enable the PV inverter to produce power.
This type of system must be able to maintain power generation in balance with
power consumption at all times. If there is more power being generated than can
be consumed by the loads, power will flow to the inverter/charger and be
converted to DC power which flows into the battery. Once the battery reaches
capacity, power generation by the PV inverter must be curtailed to maintain the
balance between generation and consumption. As the battery bank reaches
capacity, Conext SW curtails PV inverter generation by raising the AC line
frequency causing compatible PV inverters to reduce their power output in an
orderly manner. This is called Active Frequency Shift Power Curtailment.
During a grid outage even a home with a grid-tie PV inverter system will be
without power because PV inverters cannot produce power without the presence
of a reference voltage and frequency. To enable the PV inverter to provide power
during a grid outage the Conext SW is retrofitted in front of the PV inverter. The PV
inverter is rewired from the grid connection to a critical load (sub) panel and the
AC Couple is on the Conext SW AC Output port.
Figure 1-7 Load Shaving 2-Hour Delay Example
:: : : : :
PLSDelay
ABS FLOAT FLOAT
LOAD SHAVE
set start
LOAD SHAVE
actual start
ABS starts
FLOAT starts
2-hour delay starts