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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 Solsum F

6.6F, 8.8F, 10.10F

  • Easy to use charge controller
  • LED display
  • Automatic battery voltage detection
  • Full load protection
  • Low self consumption


The Steca Solsum F-Line continues the huge success of one of the most used SHS controllers. With a power range of up to 10 A at automatically recognized 12 V or 24 V it fits to a system sizes of maximum 240 W.

Full circuit board protection with LED display for simple recognition of battery status. Various connections make it possible to connect easily to solar panels, battery and load. The Steca Solsum F works on PWM as a low loss series controller.


Technical drawing: Steca Solsum F 6.6F, 8.8F, 10.10F

Product features

  • Serial topology with MOSFETs
  • Automatic detection of voltage
  • Voltage regulation
  • PWM control
  • Multistage charging technology
  • Current compensated load disconnection
  • Automatic load reconnection
  • Temperature compensation
  • Negative earthing of one or positive earthing of several terminals possible
  • Monthly equalisation charge

Electronic protection functions

  • Overcharge protection
  • Deep discharge protection
  • Reverse polarity protection of module (≤36 V),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


  • Multifunction LED display
  • Multi-coloured LED
  • 4 LEDs show operating states
  • for operation, state of charge, fault messages


  • Evening or night light function pre-set in the factory or adjustable via Steca PA RC 100
  • Parameterisation of function values via Steca PA RC 100


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


  • Steca PA RC100



  •  Steca Solsum F certificate CE · pdf · 0.789 MB

Product data sheet

  •  Steca Solsum F productdatasheet DE · pdf · 0,288 MB
  •  Steca Solsum F productdatasheet EN · pdf · 0.288 MB
  •  Steca Solsum F productdatasheet ES · pdf · 0,289 MB
  •  Steca Solsum F productdatasheet FR · pdf · 0,289 MB


  •  Steca Solsum F manual DE · pdf · 0.067 MB
  •  Steca Solsum F manual EN · pdf · 0.063 MB
  •  Steca Solsum F manual ES · pdf · 0.068 MB
  •  Steca Solsum F manual FR · pdf · 0.070 MB
  •  Steca Solsum F manual IT · pdf · 0.063 MB

Product pics, technical drawings, etc.

  •  Steca Solsum F product pic 3D · jpg, 300 DPI, high quality · 1.215 MB
  •  Steca Solsum F product pic 3D · jpg, 72 DPI, web quality · 0.415 MB
  •  Steca Solsum F product pic · jpg, 300 DPI, high quality · 1.252 MB
  •  Steca Solsum F product pic · jpg, 72 DPI, web quality · 0.418 MB
  •  Steca Solsum F product pic drawing · jpg, 300 DPI, high quality · 0.344 MB
  •  Steca Solsum F product pic drawing · jpg, 72 DPI, web quality · 0.166 MB

Technical data

  6.6F 8.8F10.10F
Characterisation of the operating performance
System voltage
12 V (24 V)
Own consumption
< 4 mA
DC input side
Open circuit voltage solar module (at minimum operating temperature)
< 47 V
Module current
6 A
8 A
10 A
DC output side
Load current
6 A
8 A
10 A
Reconnection voltage (LVR)
12.4 V … 12.7 V (24.8 V … 25.4 V)
Deep discharge protection (LVD)
11.2 V … 11.6 V (22.4 V … 23.2 V)
Battery side
End-of-charge voltage
13.9 V (27.8 V)
Boost charge voltage
14.4 V (28.8 V)
Set battery type
Operating conditions
Ambient temperature
-25 °C … +50 °C
Fitting and construction
Terminal (fine / single wire)
4 mm² / 6 mm² - AWG 12 / 9
Degree of protection
IP 31
Dimensions (X x Y x Z)
145 x 100 x 30 mm
ca. 150 g
  • Technical data at 25 °C / 77 °F
  • adjustable via Steca PA RC100: reconnection voltage, deep discharge protection, end of charge voltage, boost charge voltage, battery type
  • 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
Solar charge controller, Selection, Basic, Classic, Advanced

Selecting the solar charge controller

Guide to the various models and their functions
» more

Press releases

AL-KO Group invests in Steca Elektronik GmbH

AL-KO GmbH, Munich-based parent company of the international firm AL-KO Kober SE, gets on board as an investor and strategic partner with Memmingen-based electronics service provider Steca Elektronik GmbH.
» more
The anniversary with Managing Director Michael Voigtsberger

Anniversary at Steca Elektronik

The Allgäu electronics specialist Steca has every reason to be proud: the company’s own factory in Bulgaria celebrated its tenth birthday in the middle of September.
» more
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+49 (0) 8331 85 58-100

Steca Elektronik GmbH
Mammostraße 1
87700 Memmingen

Fax +49 (0) 8331 85 58-132

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