Technical data
PV
OFF GRID
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Steca Elektronik GmbH | 87700 Memmingen | Germany | Fon +49 (0) 8331 8558-0 | Fax +49 (0) 8331 8558-132 | www.stecasolar.com
Batterie
AC
AC
AC
AC
DC
DC
A
D
C
B
E
F
G
H
Steca Solsafe
Blackout - and there is still a light!
Large-scale power supply failures become
more and more frequently. With emergency
systems such as generators or uninterrupti-
ble power supplies (UPS), the power supply
can be assured for a certain time.
In case of a power outage, the grid-connected
PV system also stops working. This means that
although power may be available, it cannot be
used. The SOLSAFE system offers a simple, effici-
ent and cost-effective solution to this problem.
Installing one of our combined inverters Steca
XPC, Compact, HPC or Xtender with the supple-
mentary ARM-01 module and a battery system
turns any grid-connected PV system into an emer-
gency power supply in the event of a power outa-
ge. If the public grid is available, the electrical out-
put generated by the solar modules is fed directly
into the grid by the StecaGrid inverter (B) and the
feed meter (D). In parallel to this, the unsupplied
loads (H) receive power directly from the grid, via
the consumption meter (E). The batteries are kept
fully charged from the public grid via the Steca
hybrid inverter system (F) and recharged if neces-
sary. Furthermore, the supplied loads (G) receive
power from the public grid during transfer mode.
If there is a grid outage, the Steca hybrid inverter
system automatically switches to the mode of
operation as a stand-alone inverter, and con-
tinues to feed power to the supplied loads (G)
without any interruption. Because the StecaGrid
grid-feed inverter can no longer supply power
to the grid, its output is channelled directly to
the supplied loads (G) by the ARM-01 switch (C).
In this way, the loads can receive power directly
from the grid inverter of the solar modules. At
the same time, the battery can be recharged with
the available solar energy longer. The supplied
loads can receive power during the night.
With this set-up, the capacity of the battery can
be kept small, allowing for an optimal design of
system costs.
The SOLSAFE system is fully automatic and can be
integrated into any new or existing PV system.
Grid inverters
StecaGrid
300/500
300 W - 3,600 W
Functions
Flexible and expandable
Efficiency of up to 95.8%
MiniString concept
Low weight
Simple installation
Just one StecaGrid Control per
system
Page 8
StecaGrid 2000+
2,000 W up to several 10,000 W
Functions
DualString concept
Flexible and expandable
Master-slave concept
Fanless and maintenance-free
Efficiency of up to 95.0%
Informative display
Low weight
Simple installation
Page 10
Legend:
A Solar modules
B Grid-connected inverter
StecaGrid 2000+
C ARM-01 option
D Grid-feed electricity meter
Consumption electricity meter
F Steca XPC,
Steca HPC or Steca Compact stand-alone inverter
G Supplied loads
H Unsupplied loads
SOLSAFE ensures the power supply, and furthermore allows
the solar energy to be fully utilised.
Why choose Steca Solsafe?
It allows a great system flexibility.
The grid inverter is designed according to the PV generator,
and the „stand-alone inverter“ according to the desired emer-
gency power supply.
The PV system’s output and operating voltage can be freely
selected, and do not depend on the size and battery voltage
of the emergency power supply. Please notice that the AC
output of the grid-feed inverter may never be greater than the
rated output of the stand-alone inverter.
The PV voltage of the grid inverter does not depend on the
battery voltage.
Stand-alone inverters
Steca XPC
1400-12, 2200-24, 2200-48
Functions
Performance category:
1,400-2,200 W
Adjustable integrated battery
charger
Adjustable, automatic load
detection
Can be used as a backup
systemor UPS
Multifunction contact
Page 59
Steca HPC
2800-12, 4400-24,
6000-48, 8000-48
Functions
Performance category: 2,800-8,000 W
Adjustable integrated battery
charger
Excellent overload behaviour
Adjustable, automatic load detection
Can be used as a backup system or
UPS
Adjustable power distribution
Multifunction contact
Page 61
Steca Compact
1600-12, 2600-24, 4000-48
Functions
Performance category: 1,600-4,000 W
Adjustable integrated battery charger
Excellent overload behaviour
Adjustable, automatic load detection
Can be used as a backup system or
UPS
Adjustable power distribution
Multifunction contact
Page 60
Steca Xtender XTH
3000-12, 5000-24,
6000-48, 8000-48
Functions
Performance category: 3,000-72,000 W
Adjustable integrated battery charger
Up to three inverters per phase can be
connected in parallel
Adjustable, automatic load detection
Can be used as a backup system or UPS
Three-phase system: 9,000-72,000 W
Page 62
Existing grid-connected solar power systems
can be fitted with „Steca Solsafe“ without
alterations of any kind.
The available PV capacity is added to that of
the „stand-alone inverter“ in the event of a
power outage, or the solar power is stored in
the battery.
It can be installed into any existing system
without problems.