Application Note| REACT-3.6/4.6-TL – BACKUP OUTPUT|Operation and Configuration 3
1.
Scope and field of application
The REACT system is provided with a source of alternating current (AC) available with an output on a dedicated terminal
block, capable of feeding household utilities independently on the local power grid. This function is called a “backup”.
The purpose of this document is to describe the operation and configuration of the backup function available for the
models listed in the following table:
Models
REACT-UNO-3.6 -TL (with or without REACT-BATT-AP1)
REACT-UNO-4.6 -TL (with or without REACT-BATT-AP1)
2.
Operation principle
Backup operation is an additional feature provided by the REACT system that allows the inverter to feed household
utilities independently on the network of the local distributor. The system works based on the typical principle of
Stand-Alone systems non-connected to the network with, in addition, a backup energy supply due to the presence of
batteries capable of supporting photovoltaic production to feed the users connected to the line dedicated to the
backup.
The backup output can be used to feed loads (that will be defined as “priority loads”) connected either to the home
network or to the dedicated line, or to feed utilities connected exclusively with the same backup line.
For a description of the operating principle and referring to the connection layout shown in the figure below, 3 types
of loads can be identified in a system where the REACT device has been installed, namely:
Priority Loads
: utilities connected exclusively either to the electric system or to the backup line. Priority loads
will be fed by the local network or by the backup line depending on the configuration of the connection
circuit and on the type of relay used (see an example in Chapter 6).
Priority loads will never be fed simultaneously by the backup and the electric system.
Backup Loads
: these loads are connected exclusively to the backup line, i.e. utilities independent on the local
electric system. These utilities can be fed only in backup mode, when enabled for operation (e.g. Emergency
lights).
Grid Loads
: these loads are connected exclusively to the electric system, therefore they are never fed by the
backup output.
Schematic diagram of a household system with backup line
