AC Coupling Guide

Supported Architectures
XW Pro inverters use Frequency Shift to regulate battery charge current coming
from AC coupled PV. PV inverters used in AC coupled systems are recommended to
have frequency-watt controls. Legacy inverters without frequency-watt controls can be
used with some limitations (see "Operation with Legacy PV Inverters" on page14 for
more details).
Figure 3 and Figure 4 show two supported AC-coupling architectures by XW Pro battery
inverter:
n Critical loads are connected on the AC Out side of the XW Pro output (without
external contactor)
n Critical loads are connected on the AC1 side of the XW Pro output (with external
contactor)
For systems using Li-ion batteries, it is recommended to operate the XW Pro with State
of Charge Control enabled for enhanced AC coupling performance and DC voltage
regulation at high SOC. State of Charge Control can be used when a Conext
Battery Monitor or a compatible battery listed in the XW Pro Li-Ion Battery Solution Guide
(document number 990-6359) is connected to the system.
Figure 3AC-coupled system without external contactor
XW Pro AC Coupling Solutions Guide Planning and Installation
12 This manual is intended for use by qualified personnel 990-6421