Studer Innotec SA
next3
Technical user manual V1.3 © Studer-Innotec SA 77
8 CONFIGURATION AND OPERATION OF THE NEXT3 ENERGY
SYSTEM
This chapter of the manual explains how to configure and operate the next3 with the nx-
interface for each functionality of the next3 inverter. See the chapter about the nx-interface
for its general use.
8.1 ESSENTIALS TO KNOW ABOUT A NEXT3 SYSTEM
The next3 is a hybrid inverter charger, that can work in a stand-alone (offgrid) mode or
connected to an external AC source, being a grid or a generator.
A few concepts must be understood to use and configure the next3 systems properly:
• The next3 has a connection named “AC-Source” where comes the main AC source: the grid
or a generator.
o This input has a high security level, with doubled security relays for disconnection
according to new international grid code and safety standards (for example: IEC
62109, VDE-AR-N 4105, EN 50549-1, …). In case of connection to a distribution grid,
always connect the grid to AC-Source.
o The choice to use AC-source to connect to the grid or to a genset is done during the
first configuration of the system. It cannot be change ‘live’, while the system is working,
and would need a complete reset of the system if you want to change it. The
behaviour of the next3 is different with a grid or with a genset.
o The grid code choice must be set properly by the qualified installer during
commissioning according to the local requirements of the DSO (Distribution System
Operator). This is done during the wizard process. It can only be changed with a
complete reset of the system and restart of the wizard process. The access code
“Expert” that enable access to the wizard after the first commissioning is not public for
this reason.
o There is only one connection to one AC-source in a system even in a multi-unit system
when there are physically multiple connections.
▪ Transfers are never used in parallel and only one transfer switch will be
operated. That means the max transfer current is 80A even with 3 next3 in
parallel.
▪ The identification of which AC input is used in multi-system is done during the
wizard configuration process.
o The next3 is an “offline UPS”, that means the AC main is supplied directly to the load
with the internal transfer switch (no double conversion). This implicate that the voltage
and frequency of the grid is the same on the loads side.
• On the other side, it has a connection named “AC-Loads” where the load/consumption is
connected, that are supplied by the batteries/solar when there is no grid or genset.
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