Technical data

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Steca Elektronik GmbH | 87700 Memmingen | Germany | Fon [phone] | Fax [phone] | www.steca.com
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Hybrid Systems Hybrid Systems
Africa
The required bi-directional Steca Sinus inverters
Steca Xtender XTH / Steca Xtender XTM (C) can be
used in both single-phase and three-phases cases.
Up to three devices can be connected in parallel per
phase. This means that a total of 24 kW per phase is
available, with a maximum of 72 kW in three-phase
operation.
Diesel generators (G) can be used to produce up to
100 kW. This enables AC hybrid systems to be imple-
mented with outputs ranging from around 10 kW to
several 100 kW.
Single-phase and three-phase
Steca AC hybrid systems
With very large load requirements, AC-coupled hybrid
systems can provide a sensible alternative to the very
effective and cheap to implement DC hybrid systems.
This topology is beneficial if the largest part of the
loading is required on the AC side (L) during the day.
Steca AC hybrid systems can be implemented using
the Steca grid and Sinus inverters (B and C).
Various generators (A and E) are coupled to the AC
bus. In addition, bi-directional Steca Sinus inverters
(C) are deployed, which are used for charging the
batteries and can also be used for supplying the load
if the AC generators (A and E) supply insufficient
power. In addition, it is also possible to couple solar
generators via a Steca solar charge controller (D) di-
rectly to the batteries (H) on the DC side.
If insufficient energy is available in the system to sup-
ply the load, a diesel generator (G) can be automati-
cally started, which then supplies the load directly in
the AC transfer mode while simultaneously charging
the batteries. When the batteries are full, the diesel
generator (G) is automatically switched off. The load
(L) is then once again supplied directly from the ge-
nerators (A and E) on the AC side.
If insufficient power is available, the Sinus inverters
(C) provide the additionally required power from the
batteries. These form and control the AC grid.
If the solar generators (A) or other generators (E)
provide excess power on the AC side, the Sinus
inverters (C) will initially use this to recharge the bat-
teries. If the batteries are full and there is still more
power available than is required by the load (L), the
Steca Sinus inverters will increase the frequency of
the AC grid. The Steca grid inverters (B) then switch
off the solar generators (A) one after the other until
the energy balance in the overall system is restored.
If the load requirement (G) increases, the Steca grid
inverters (B) switch on again. This enables large-
scale Steca AC hybrid systems to be automatically
controlled .
With very large outputs, this kind of Steca AC hybrid
system can also be designed as a three-phase system
in order to supply corresponding loads directly. Here
the StecaGrid 10000 3ph grid inverters (B) provide
direct three-phase feeding on the AC side.
Key:
A Solar modules
B Grid inverter
StecaGrid 2010+ (single-phase)
StecaGrid 10000 3ph (three-phase)
C Sine wave inverter Steca Xtender XTH /
Steca Xtender XTM
D Solar charge controller Steca Power Tarom
E Wind turbines
F Inverter for wind turbines
G Diesel generator
H Battery
L Electrical load (230 V AC or 400 V AC)
A
A
LL
H
B
C
D
A
G
E
H
D
A
B
A
B
A
B
A
B F
E
F
C
C
C
C
C
C
C
C
L
C C C
G
H
A
B
A
B
A
B
E
A
D
A
D
F
Overview of devices:
Steca Power Tarom
Solar charge controller
55 - 140 A, 12 / 24 / 48 V
(page 33)
Steca Xtender XTM
Sine wave inverter
1,500 W - 36,000 W
(page 42)
StecaGrid 10000 3ph
Grid inverter
10,000 W up to several 100,000 W
(Steca PV Grid Connected)
StecaGrid 2010+
Grid inverter
2,000 W up to several 10,000 W
(Steca PV Grid Connected)
South Africa