Pro XW Pro AC Coupling Solutions Guide 990-6421 December 2020 https://solar.schneider-electric.
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Safety Information Important Information Read these instructions carefully and look at the equipment to become familiar with the device before trying to install, operate, service or maintain it. The following special messages may appear throughout this documentation or on the equipment to warn of potential hazards or to call attention to information that clarifies or simplifies a procedure.
XW Pro AC Coupling Solutions Guide Safety Information Audience This guide is intended for use by qualified personnel who plan to design an AC coupled installation using XW Pro battery inverters and PV inverters. The qualified personnel have training, knowledge, and experience in: n Installing electrical equipment. n Applying all applicable installation codes. n Analyzing and reducing the hazards involved in performing electrical work. n Installing and configuring batteries.
About Purpose This Solutions Guide provides planning information and safety guidelines for designing an AC-coupled system beyond what is available in the Installation and Owner’s guides. Scope This Solutions Guide applies to XW Pro battery inverters and compatible Schneider Electric or 3rd party PV inverters. The information provided below does not modify, replace or waive any of the terms and conditions mentioned in the Installation and Owner’s guides, including but not limited to the limited warranty.
XW Pro AC Coupling Solutions Guide Contents Safety Information About Purpose 5 Scope 5 Related Documents Introduction 5 7 Prerequisites 8 Overview 8 Surplus Power in Off-Grid/Backup Modes 9 Planning and Installation 6 3 5 11 Supported Architectures 12 Sizing 13 AC Coupling with a Generator 13 Operation with Legacy PV Inverters 14 Installing 15 Recommended Settings 15 Off-Grid Operation 16 This manual is intended for use by qualified personnel 990-6421
1 Introduction What's in This Chapter? Prerequisites 8 Overview 8 Surplus Power in Off-Grid/Backup Modes 9
XW Pro AC Coupling Solutions Guide Introduction Prerequisites It is recommended to upgrade to the latest XW Pro and Conext Gateway firmware before configuring the equipment. Consult Conext Gateway Owner's Guide (975-0806-01-03) and XW Pro Owner's Guide (document number 990-91227 or 990-91402) for firmware upgrade instructions. To find the latest firmware, go to https://solar.schneiderelectric.com/products/inverterchargers/ > your product > Downloads > Firmware.
Introduction XW Pro AC Coupling Solutions Guide XW Pro switches to back-up and powers the critical load panel to support the loads. Thus, the XW Pro forms the grid to keep the PV inverters operating. The XW Pro switchover to back-up is almost instantaneous. In some cases, the PV inverter does not detect the transition and continues to operate without interruption.
2 Planning and Installation What's in This Chapter? Supported Architectures 12 Sizing 13 AC Coupling with a Generator 13 Operation with Legacy PV Inverters 14 Installing 15 Recommended Settings 15 Off-Grid Operation 16
XW Pro AC Coupling Solutions Guide Planning and Installation 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).
Planning and Installation XW Pro AC Coupling Solutions Guide Figure 4 AC-coupled system with external contactor Sizing The XW Pro can be connected in various configurations from just a single unit to multiple units in parallel, or in a three-phase configuration.
XW Pro AC Coupling Solutions Guide Planning and Installation regular grid) and begins to inject power into the system. However, generators are not designed to accept backfed power, so the concurrent operation of the AC source and PV inverters must be disallowed. While the generator is running, the PV inverter must be disconnected from the circuit and therefore PV harvest is only possible when the generator is not running and XW Pro is grid-forming.
Planning and Installation XW Pro AC Coupling Solutions Guide Installing Each PV inverter requires its own AC breaker in the panel to which it is connected. Although there is room to add breakers for the PV inverters directly into the XW Pro Power Distribution Panel, it is easier to install the breakers in the AC sub panel. These breakers must be installed according to the XW Pro Installation Guide (document number 990-91228 or 990-91403). The sub-panel may also contain load breakers.
XW Pro AC Coupling Solutions Guide Planning and Installation Table 2 PV inverter settings Setting Value Notes Ensure that grid code settings match the PV inverter. Grid Code The battery inverter grid code must be For advanced off-grid configuration set according to local utility refer to "Off-Grid Operation" below. interconnect requirements. For advanced grid code configuration or troubleshooting see "Troubleshooting" on page 1.
