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.

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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 Elektronik GmbH

Fon: +49-(0)8331-8558-0
Fax: +49-(0)-8331-8558-131

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Steca PR

1010, 1515, 2020, 3030

  • High End State of Charge control (SOC)
  • Professional battery care
  • Full grafical display
  • Automatic battery voltage detection
  • Full load protection
Steca PR 3030 picture 3D.jpg
Steca PR 3030 picture.jpg
Steca PR 3030 picture 3D.jpg
Steca PR 3030 picture.jpg


The Steca PR 10-30 series of charge controllers is the highlight in the range. 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 in the form of 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 PR 1010, 1515, 2020, 3030

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

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


  • Approved by the World Bank for Nepal
  • 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 PR certificate · pdf · 0.828 MB
  •  Steca PR certificate CE · pdf · 0.792 MB

Product data sheet

  •  Steca PR productdatasheet DE · pdf · 0,262 MB
  •  Steca PR productdatasheet EN · pdf · 0.262 MB
  •  Steca PR productdatasheet ES · pdf · 0,262 MB
  •  Steca PR productdatasheet FR · pdf · 0,263 MB


  •  Steca PR manual Menü Ladenspannungen · pdf · 0.070 MB
  •  Steca PR manual Menu charging voltage · pdf · 0.069 MB
  •  Steca PR manual DE · pdf · 1.116 MB
  •  Steca PR manual EN · pdf · 1.124 MB
  •  Steca PR manual ES · pdf · 1.124 MB
  •  Steca PR manual FR · pdf · 1.124 MB
  •  Steca PR manual IT · pdf · 1.114 MB
  •  Steca PR manual PT · pdf · 1.118 MB

Product pics, technical drawings, etc.

  •  Steca PR product pic 3D · jpg, 300 DPI, high quality · 0.111 MB
  •  Steca PR product pic 3D · jpg, 72 DPI, web quality · 0.111 MB
  •  Steca PR product pic · jpg, 300 DPI, high quality · 0.137 MB
  •  Steca PR product pic · jpg, 72 DPI, web quality · 0.137 MB
  •  Steca PR product pic drawing · jpg, 300 DPI, high quality · 0.430 MB
  •  Steca PR product pic drawing · jpg, 72 DPI, web quality · 0.236 MB

Technical data

 PR 1010PR 1515PR 2020PR 3030
Characterisation of the operating performance
System voltage
12 V (24 V)
Own consumption
12.5 mA
DC input side
Open circuit voltage solar module (at minimum operating temperature)
< 47 V
Module current
10 A
15 A
20 A
30 A
DC output side
Load current
10 A
15 A
20 A
30 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 31
Dimensions (X x Y x Z)
187 x 96 x 44 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

Steca‘s 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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