Steca Xtender
Installation and Operating Instructions 723.932 Xtender V0.511 Seite 10
4.1 Choice of system The Xtender may be used in different system types, each of which must meet the standards and
particular requirements associated with the application or site of installation. Only an
appropriately qualified installer can advise you effectively on the applicable standards with regard
to the various systems and the country concerned.
Examples of cabling are presented in appendix I of this manual, fig. 5 and following. Please
carefully read the notes associated with these examples in the tables on p. 29 and following.
4.1.1 HYBRID TYPE STAND-ALONE SYSTEMS
The Xtender can be used as a primary supply system for grid-remote sites where a renewable
energy source (solar or hydraulic) is generally available and a generator is used as backup. In
this case, batteries are generally recharged by a supply source such as solar modules, wind
power or small hydropower systems. These supply sources must have their own voltage and/or
current regulation system and are connected directly to the battery. (Example, fig. 11)
When the energy supply is insufficient, a generator is used as a back-up energy source. This
allows the batteries to be recharged and direct supply to consumers via the Xtender transfer relay.
When the input voltage source is a low power generator (lower than the power) the
factory settings (adapted to grid-connection) must be modified according to the
“generator” column in the configuration table on p. 35.
4.1.2 GRID-CONNECTED EMERGENCY SYSTEMS
The Xtender can be used as an emergency system, also known as an uninterruptible power
supply (UPS) – enabling a reliable supply to a site connected to an unreliable network. In the
event of an interruption to the energy supply from the public network, the Xtender, connected to a
battery, substitutes the faulty source and enables a support supply to the users connected
downstream. These will be supplied as long as the energy stored in the battery allows. The
battery will quickly be recharged at the next reconnection to the public grid.
Various application examples are described in figs. 8a – 8c in appendix I.
The use of the Xtender as a UPS must be carried out by qualified personnel who have
been checked by the responsible local authorities. The diagrams in the appendix are
given for information and as a supplement. The applicable local standards and
regulations must be adhered to.
4.1.3 INTEGRATED MOBILE SYSTEMS
These systems are meant to be temporarily connected to the grid and ensure the supply of the
mobile system when this is disconnected from the grid. The main applications are for boats,
service vehicles and leisure vehicles. In these cases, two separate AC inputs are often required,
one connected to the grid and the other connected to an on-board generator. Switching between
two sources must be carried out using an automatic or manual reversing switch, conforming to
the applicable local regulations. The Xtender has a single AC input.
Various application examples are described in figs. 10a – 10b – 10c).
4.1.4 MULTI-UNIT SYSTEMS
Whatever system is selected, it is perfectly possible to realise systems composed of several units
of the same type and the same power output. Up to three Xtenders in parallel or three extenders
forming a three-phase grid or three times two with three Xtenders in parallel forming a three-
phase / parallel grid, may be thus combined.