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 Tarom

4545, 4545-48

  • Large graphical display
  • Extensively programmable
  • Optimal state of charge determination
  • Innovative, comprehensive data logger with energy meter
  • Best choice for system sizes up to 2,700 Wp
Steca Tarom 4545 picture 3D.jpg
Steca Tarom 4545 picture.jpg
Steca Tarom 4545 picture 3D.jpg
Steca Tarom 4545 picture.jpg


The new design for the Steca Tarom sets new standards in this power class. A graphic display informs the user about all important system data and enables configuration and adjustment of the controller to the specific requirements of the individual system.

Numerous clever functions allow the user to adjust the controller to the particular features of the system in question. Thanks to the significantly improved state of charge determination, the system is optimally controlled and the batteries are protected. The Steca Tarom charge controller is the ideal choice for larger systems at three voltage levels (12 V, 24 V, 48 V).

The integrated data logger stores all important system data. Controller data can be read by the minute via an open Steca UART interface. As an option, an external temperature sensor can also be connected.
Two additional switching contacts can be freely configured as a timer, a night light function, to start generators or as surplus management. Up to six devices can be connected in parallel and communicate with one another via the StecaLink bus.


Technical drawing: Steca Tarom 4545, 4545-48

Product features

  • Shunt topology with MOSFETs
  • MicroSD slot for data logging of all minute values
  • State of charge determination (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
  • Real-time clock (date, time)
  • Innovative, comprehensive data logger with energy meter
  • MicroSD slot for data logging of all minute values
  • Evening, night light and daylight functions
  • Four freely programmable timers with week day function
  • Integrated self test
  • Monthly equalisation charge
  • Two configurable multifunctional contacts
  • Adjustable cut-off voltages

Electronic protection functions

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


  • Multifunction graphical LC display with backlighting


  • Simple menu-driven operation
  • Programming by buttons


  • StecaLink Bus
  • Open Steca UART interface


  • Alarm contact


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


  • Data cable Steca PA CAB2 Tarcom
  • Current sensor PA HS 400
  • External temperature sensor Steca PA TS-S




  •  Steca Tarom certificate CE · pdf · 0.844 MB

Product data sheet

  •  Steca Tarom productdatasheet DE · pdf · 0,259 MB
  •  Steca Tarom productdatasheet EN · pdf · 0.264 MB
  •  Steca Tarom productdatasheet ES · pdf · 0,266 MB
  •  Steca Tarom productdatasheet FR · pdf · 0,263 MB


  •  Steca Tarom manual DE · pdf · 4.227 MB
  •  Steca Tarom manual EN · pdf · 4.156 MB
  •  Steca Tarom manual ES · pdf · 4.397 MB
  •  Steca Tarom manual FR · pdf · 4.316 MB

Product pics, technical drawings, etc.

  •  Steca Tarom product pic 3D · jpg, 300 DPI, high quality · 0.951 MB
  •  Steca Tarom product pic 3D · jpg, 72 DPI, web quality · 0.267 MB
  •  Steca Tarom product pic · jpg, 300 DPI, high quality · 0.541 MB
  •  Steca Tarom product pic · jpg, 72 DPI, web quality · 0.197 MB
  •  Steca Tarom product pic drawing · jpg, 300 DPI, high quality · 0.475 MB
  •  Steca Tarom product pic drawing · jpg, 72 DPI, web quality · 0.253 MB

Technical data

Characterisation of the operating performance
System voltage
12 V (24 V)
12 / 24 / 48 V
Own consumption
30 mA
DC input side
Open circuit voltage solar module (at minimum operating temperature)
< 60 V
< 100 V
Module current
45 A
DC output side
Load current
45 A
Reconnection voltage (SOC / LVR)
> 50 % / 12.5 V (25 V)
> 50 % / 50 V
Deep discharge protection < 30 % (SOC / LVD)
< 30 % / 11.7 V (23.4 V)
< 30 % / 46.8 V
Battery side
End-of-charge voltage
14.1 V (28.2 V)
56.4 V
Boost charge voltage
14.4 V (28.8 V)
57.6 V
Equalisation charge
15 V (30 V)
60 V
Set battery type
liquid (adjustable via menu)
Operating conditions
Ambient temperature
-10 °C … +60 °C
Fitting and construction
Terminal (fine / single wire)
25 mm² / 35 mm² - AWG 4 / 2
Degree of protection
IP 31
Dimensions (X x Y x Z)
218 x 134 x 65 mm
800 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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