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Application Note 003
Solsafe concept, installation
design and commissioning
General information for Solsafe concept
with Compact series
This particular application requires a Compact
(XPC, C or HPC) driving the external auxiliary
relay module ARM-01
The ARM-01 is a module consisting of 4
auxiliary relays to use only with the Compact
series. The K1 and K2 relays have a dedicated
function to the Solsafe application. The K3 relay
is not used and the K4 relay is a replication of
the auxiliary contact of the inverter-charger and
can be programmed for particular applications
This module is already included in the S-Box
(type S-Box-25C).
Using the S-Box (type S-Box-25C) will greatly
facilitate the wiring of Solsafe system.
General information for Solsafe concept
with Xtender series
This particular application requires an Xtender
(XTH or XTM) with auxiliary contact AUX1 and
AUX2 specifically programmed to drive the
contactor of the source switch-over.
The specific programming is done by loading
the preset Solsafe available in the libraries of
predefined parameters (see the programming
guide on the next page for more information).
Using the S-Box (type S-Box-25X) will greatly
facilitate the wiring of Solsafe system.
General information for the Solsafe
concept with Xtender three-phase
system
This particular application requires 3 Xtender
(XTH or XTM) with auxiliary contact AUX1 and
AUX2 specifically programmed to drive the
contactor of the source switch-over.
Note that Studer Innotec does not supply pre-
wired S-Box for three-phase systems. But it is
possible to order all the necessary equipment at
Studer Innotec (List of equipment, preset
Solsafe and information on the assembly are
available in appendices).
ENS module
When using the Solsafe concept, the function
“impedance jumps” (or ENS
i
) on the grid inverter
must be always turned off (impedance of
inverter is not similar to the one of the grid)
ii
.
Thus, if the function “jumps impedance” is
mandatory, it is required to add an external ENS
module in the grid feeding path.
Studer Innotec recommends two ENS modules
of the company UfE GmbH. The ENS 26 for
single phase system and the ENS 31 for three
phase system.
The module ENS 26 is already included in the
S-Box type S-Box-25C-E and S-Box-25X-E.
System dimensioning
Grid Inverter
The power of the grid inverter can be freely
chosen but the maximum output power should
not be higher than the inverter-charger nominal
power.
Note that the wiring should be in accordance
with the manufacturer’s and local’s
prescriptions.
Battery
Battery should be sized according to the backup
time requirement, but we recommend a
minimum size of : C10 ≥ 5x P
pv
/U
batt
.
Inverter-charger (Compact series or Xtender
series)
The inverter-charger must be sized according to
the maximum secured power.
For the Compact and Xtender series,
the stand-by must be at 0 to work with
the Solsafe system.
Notes
i
An ENS-Module is used to connect decentralized
electricity generators to the public electricity supply and
in the event of faults in the mains supply, the ENS-
Module interrupts the feeding of electricity of the
monitored phase into the mains to prevent an islanding
effect.
The following deviations are monitored :
overvoltage and undervoltage
frequency deviation
impedance jumps
These instructions are directly extracted from Chapter
2.1 of Module ENS manual of the company UfE GmbH.
More information available on www.ufegmbh.de
ii
Grid inverter manufacturer will give the procedure to
deactivate the function “impedance jumps”.
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