AC Coupling Guide

Setting Value Notes
Grid
Code
The battery inverter grid code must be
set according to local utility
interconnect requirements.
Ensure that grid code settings match the
PV inverter.
For advanced off-grid configuration
refer to "Off-Grid Operation" below.
For advanced grid code configuration or
troubleshooting see "Troubleshooting"
on page1.
Table 2PV inverter settings
Off-Grid Operation
For off-grid operation (with or without a generator), as a first option, both the battery and
PV inverters are recommended to be set to the same grid code. For example for 60Hz,
the recommended grid code is Rule 21 and for 50Hz - Australia AS4777. The battery's
inverter frequency-shifting settings are auto-configured to match the grid code and,
consequently, the PV inverter's P(f) settings.
As a second option, when it is not possible to set the battery and PV inverter to the same
grid code, it is recommended to disable Freq-Watt P(f) Droop and Freq-Watt P
(f) PreDist on the battery inverter (Figure 6) in Grid Codes settings. The smart
AC-coupled PV inverter's P(f) curve should be set to start active power reduction at
nominal frequency 50/60 Hz and finish it (fully reduce to zero) at 54/64 Hz. This is what
the battery inverter frequency shift is configured to in case when grid code P(f) is not
activated on it.
Figure 6Disabling grid code frequency shifting in Conext Gateway GUI
Legacy PV inverters without frequency-watt function must be set so that they trip
instantly once frequency is approaching 54/64 Hz.
XW Pro AC Coupling Solutions Guide Planning and Installation
16 This manual is intended for use by qualified personnel 990-6421