Schneider Electric User Guide

Prioritizing and Managing Energy Sources with Advanced Features
975-0240-01-01 3–33
To help the batteries supplement the power requirements of the connected load,
an additional source of power (solar, wind, or hydroelectric) is recommended.
The default PLS setting for Time in Float is zero. In this case, PLS is only entered/
exited as programmed within the time window.
When the Time in Float is different than zero, PLS shall start only if the battery
amperage remained at the specified level for the configured time.
Example Settings Load Shave=Enabled, Load Shave Amps=10 A, LoadShaveStart=6:00pm,
LoadShaveStart=9:00pm, Time in Float=60 min, PLS Dly 2h= Enabled
.
With these example settings, the Conext XW+ would enter PLS within the
configured window of time only if the battery was charged from MPPT in Float
(including Absorption) for 2 hours.
Time-of-Use Metering
Utilities use time-of-use metering to determine utility charges during peak usage
hours and to impose a surcharge. The Conext XW+ can be configured (using the
Load Shave Start, Load Shave Stop and Charger Block settings) to overcome
these peak charges by using utility power to charge the battery bank during the
inexpensive energy hours and consuming the battery energy during expensive
energy hours.
For example, if Charger Block is set between 9:00 AM and 10:00 PM and Load
Shave is set between 6:00 PM and 9:00 PM, charging on AC1 stops at 9:00 AM
and continues to pass through utility AC to the loads. If charging is required
during the charger block period, and AC Priority is set to AC2, the Conext XW+
can use any AC source connected to AC2. Loads will transfer to the AC source
on AC2 as well. The inverter connects to the utility grid at 6:00 PM and supports
loads using the batteries. The inverter continues to run until 9:00 PM. The Conext
XW+ then stops supporting the utility grid and passes utility AC through to the
loads. At 10:00 PM utility AC begins maintaining the batteries based on the
battery charger settings.
The above example allows an external renewable energy source to be utilized as
a primary charging source during a desired time window. The charger
(using utility AC connected to AC1) can then be used to supplement the battery
charging when the utility rates are low.
Note: When actively operating, the Conext XW+ compensates for active power
as a reference for controlling the total current as specified in the Load Shave
Amps setting. However, there is also reactive power that is not compensated for
by the Conext XW+. For example, if Load Shave Amps is set to 10A, the inverter
will only start drawing power from the batteries at a current level which would
measure approximately 11A which is 1A higher than the Load Shave Amps value
to meet the demand of the loads.
Conext XW+ Owner's Guide NA (975-0240-01-01).book Page 33 Monday, November 27, 2017 10:00 AM