Conext SW 4048-120 Manual Addendum

Documentation Update
976-0315-01-01 Rev E 7
allows the battery to be fully charged before either load shaving or AC support
mode is engaged. This feature is useful in applications where battery micro-
cycling is to be minimized in order to maximize battery life. See below.
Example: Load Shave = Enabled
LoadShaveStart = 10:00AM
PLSDelay = Enabled
Absorption to float charging starts at 7:00 AM and load shaving is set to start at
10:00 AM. Absorption transitions to float at 9:00 AM but because PLSDelay is
enabled, the 2-hour delay inhibits load shaving to actually start at 10:00 AM.
Because of the 2-hour delay, load shaving does not start until 11:00 AM. See
“Load Shaving 2-Hour Delay Example” on page 7.
The feature also ensures that self-consumption of harvested solar energy is
optimized. The 2-hour delay works only under the following conditions:
• CSW’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 “New Advanced Features
Setting” on page 12. 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
Figure 6 Load Shaving 2-Hour Delay Example
8:007:00 9:00 10:00 11:00 12:00
PLSDelay
ABS FLOAT FLOAT
LOAD SHAVE
set start
LOAD SHAVE
actual start
ABS starts
FLOAT starts
2-hour delay starts