Steca has long stood for ideas and innovations as an electronic manufacturing services (EMS) provider and manufacturer of Steca brand product lines in solar electronics and battery charging systems. Our capability and personal responsibility allow us all to create high-quality individual electronic products and to distribute them on a global scale. Simple business processes, fair partnerships and transparent communication are perceptible and contribute to our joint success.

The success of a project is determined by well thought out and coordinated processes, combined with the expertise, flexibility and experience of a modern service company. Steca has mastered these different steps and processes and guarantees completion to deadlines, consistent high quality and an excellent price-performance ratio.

As a leading supplier of products for the solar electronics industry, we set the international standard for the regulation and control of solar energy systems. In the three market segments PV grid connected, PV off grid and Solar thermal, the Steca brand is synonymous with innovation and vision. In conception, development, production and marketing, the company is committed to the highest quality standards.

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Steca battery charging technology stands out from the start thanks to its high quality and durability. For decades we have been developing efficient and user-friendly charging technology in cooperation with leading battery manufacturers and institutes in order to ensure that you can use your batteries safely.

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Steca Solarix

2525, 4040

  • High End State of Charge control (SOC)
  • Professional battery care
  • Full grafical display
  • Automatic battery voltage detection
  • Full load protection
Steca Solarix picture.jpg
Steca Solarix picture 3D.jpg
Steca Solarix picture.jpg
Steca Solarix picture 3D.jpg


Solar charge controllers Steca Solarix 2525 and 4040 are newly developed products based on the internationally renowned controller family Steca PR. With increased module and load current, the controllers are now also suitable for even larger systems. The devices also feature an integrated USB charging port for charging smartphones and tablets.
Use of the latest charging technologies combined with state of charge determination enable optimal battery maintenance and module power monitoring. A large display informs the user about all operating modes with the aid of symbols. The state of charge is represented visually as a level meter. Data such as voltage, current and state of charge can also be displayed digitally as figures on the display. In addition, the controller has an energy meter which can be reset by the user.


Technical drawing: Steca Solarix 2525, 4040

Product features

  • Shunt topology with MOSFETs
  • State of charge determination with Steca AtonIC (SOC)
  • Automatic detection of voltage
  • PWM control
  • Multistage charging technology
  • Load disconnection depending on SOC
  • Automatic load reconnection
  • Temperature compensation
  • Negative earthing of one or positive earthing of several terminals possible
  • Integrated data logger (energy meter)
  • Evening, night light and daylight functions
  • Integrated self test
  • Monthly equalisation charge
  • USB charge socket for smartphones and tablets

Electronic protection functions

  • Overcharge protection
  • Deep discharge protection
  • Reverse polarity protection of module, load and battery
  • Automatic electronic fuse
  • Short circuit protection of load and module
  • Overvoltage protection at module input
  • Open circuit protection without battery
  • Reverse current protection at night
  • Overtemperature and overload protection
  • Load disconnection on battery overvoltage


  • Graphical LC display
  • for operating parameters, fault messages, self test


  • Simple menu-driven operation
  • Programming by buttons
  • Manual load switch


  • Alarm contact


  • Compliant with European Standards (CE)
  • RoHS compliant
  • Made in EU
  • Manufactured according to ISO 9001 and ISO 14001


  • External temperature sensor Steca PA TS10



  •  Steca Solarix certificate CE · pdf · 0.779 MB

Product data sheet

  •  Steca Solarix productdatasheet DE · pdf · 0,280 MB
  •  Steca Solarix productdatasheet EN · pdf · 0.280 MB
  •  Steca Solarix productdatasheet ES · pdf · 0,280 MB
  •  Steca Solarix productdatasheet FR · pdf · 0,281 MB


  •  Steca Solarix manual DE · pdf · 0.706 MB
  •  Steca Solarix manual EN · pdf · 0.701 MB
  •  Steca Solarix manual ES · pdf · 0.713 MB
  •  Steca Solarix manual FR · pdf · 0.713 MB
  •  Steca Solarix manual IT · pdf · 0.694 MB
  •  Steca Solarix manual PT · pdf · 0.697 MB

Product pics, technical drawings, etc.

  •  Steca Solarix product pic 3D · jpg, 300 DPI, high quality · 1.222 MB
  •  Steca Solarix product pic 3D · jpg, 72 DPI, web quality · 0.380 MB
  •  Steca Solarix product pic · jpg, 300 DPI, high quality · 1.141 MB
  •  Steca Solarix product pic · jpg, 72 DPI, web quality · 0.388 MB
  •  Steca Solarix product pic drawing · jpg, 300 DPI, high quality · 0.263 MB
  •  Steca Solarix product pic drawing · jpg, 72 DPI, web quality · 0.099 MB

Technical data

Characterisation of the operating performance
System voltage
12 V (24 V)
Own consumption
18,5 mA
DC input side
Open circuit voltage solar module (at minimum operating temperature)
< 47 V
Module current
25 A
40 A
DC output side
Load current
25 A
40 A
USB charge socket
5.2 V / 1.5 A
Reconnection voltage (SOC / LVR)
> 50 % / 12.6 V (25.2 V)
Deep discharge protection < 30 % (SOC / LVD)
< 30 % / 11.1 V (22.2 V)
Battery side
End-of-charge voltage
13.9 V (27.8 V)
Boost charge voltage
14.4 V (28.8 V)
Equalisation charge
14.7 V (29.4 V)
Set battery type
liquid (adjustable via menu)
Operating conditions
Ambient temperature
-10 °C … +50 °C
Fitting and construction
Terminal (fine / single wire)
16 mm² / 25 mm² - AWG 6 / 4
Degree of protection
IP 30
Dimensions (X x Y x Z)
187 x 97 x 45 mm
350 g
  • Technical data at 25 °C / 77 °F
  • Inverters must not be connected to the load output.
SOC, state of charge, determination, charging technology

Our charging technology

SOC means the current 'state of charge' of the battery. This is given as a percentage.more
Night light systems, special application, Solar Home Systems, greece

Night light systems

Special use of solar home systems for street lights, bus stops and other automatic night lights.more
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