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.

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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 Solarix 2020-x2

Dual battery charge controller

  • Two different battery types can be connected
  • 12 V or 24 V voltage can be combined with main and auxiliary battery
  • Extremely low own consumption (for example, supported by hibernation mode)
  • Extensive programming and display options thanks to the remote display Steca PA LCD1
  • Intuitive, fully graphical remote LCD
Steca Solarix2020 x2 picture 3D.jpg
Steca Solarix2020 x2 picture.jpg
Steca Solarix2020 x2 picture 3D.jpg
Steca Solarix2020 x2 picture.jpg


The Steca Solarix 2020-x2 is a state-of-the-art dual battery charge controller that is ideal for use in leisure applications. It is equipped with a solar module input suitable for all 72-cell crystalline solar modules in 24 V systems and for all 36-cell solar modules in 12 V systems. Both main battery and starter battery are charged simultaneously and continuously by the solar module. 90 percent of the available power flows into the main battery while 10 percent of the power is retained to keep the auxiliary battery fully-charged.

The charge power split can be adapted using the Steca PA LCD1 remote display. The charge controller is equipped with a high-power load output fed by the main battery only. The charge controller has a USB charge socket, which can be used to charge smartphones and tablets. Connection of the Steca PA LCD1 remote display is optional.


Technical drawing: Steca Solarix 2020-x2 Dual battery charge controller

Product features

  • Serial topology with MOSFETs
  • Automatic detection of voltage
  • Voltage and current regulation
  • PWM control
  • Multistage charging technology
  • Current compensated load disconnection
  • Automatic load reconnection
  • Temperature compensation
  • Positive earthing of one or negative earthing of several terminals possible
  • 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 (≤36 V),load 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


  • 4 LEDs show operating states


  • StecaLink Bus


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


  • Remote display Steca PA LCD1



  •  Steca Solarix 2020-x2 certificate CE · pdf · 0.786 MB

Product data sheet

  •  Steca Solarix 2020-x2 productdatasheet DE · pdf · 0,273 MB
  •  Steca Solarix 2020-x2 productdatasheet EN · pdf · 0.272 MB
  •  Steca Solarix 2020-x2 productdatasheet ES · pdf · 0,273 MB
  •  Steca Solarix 2020-x2 productdatasheet FR · pdf · 0,273 MB


  •  Steca Solarix 2020-x2 manual DE · pdf · 0.614 MB
  •  Steca Solarix 2020-x2 manual EN · pdf · 0.440 MB
  •  Steca Solarix 2020-x2 manual ES · pdf · 0.446 MB
  •  Steca Solarix 2020-x2 manual FR · pdf · 0.447 MB
  •  Steca Solarix 2020-x2 manual IT · pdf · 0.442 MB
  •  Steca Solarix 2020-x2 manual NL · pdf · 0.437 MB
  •  Steca Solarix 2020-x2 manual PT · pdf · 0.446 MB

Product pics, technical drawings, etc.

  •  Steca Solarix 2020-x2 product pic · jpg, 300 DPI, high quality · 1.576 MB
  •  Steca Solarix 2020-x2 product pic · jpg, 72 DPI, web quality · 0.547 MB
  •  Steca Solarix 2020-x2 product pic 3D · jpg, 300 DPI, high quality · 0.846 MB
  •  Steca Solarix 2020-x2 product pic 3D · jpg, 72 DPI, web quality · 0.284 MB
  •  Steca Solarix 2020-x2 product pic drawing · jpg, 300 DPI, high quality · 0.452 MB
  •  Steca Solarix 2020-x2 product pic drawing · jpg, 72 DPI, web quality · 0.252 MB

Technical data

 Solarix 2020-x2
Characterisation of the operating performance
System voltage
12 V (24 V)
Own consumption
22 mA
DC input side
Open circuit voltage solar module (at minimum operating temperature)
< 60 V
Module current
20 A
DC output side
Load current
20 A
USB charge socket
5 V / 1.5 A
Reconnection voltage (LVR)
12.5 V
Deep discharge protection (LVD)
11.7 V
Battery side
End-of-charge voltage
14.1 V (28.2 V)
Boost charge voltage
14.4 V (28.8 V)
Equalisation charge
15 V (30 V)
Set battery type
Main / auxiliary battery charging ratio
90 % / 10 %
Operating conditions
Ambient temperature
-10 °C … +60 °C
Fitting and construction
Terminal (fine / single wire)
6 mm² / 10 mm² - AWG 10 / 8
Degree of protection
IP 31
Dimensions (X x Y x Z)
190 x 120 x 57 mm
500 g
  • Technical data at 25 °C / 77 °F
  • adjustable via Steca PA LCD1: reconnection voltage, deep discharge protection, end of charge voltage, boost charge voltage, equalisation charge, battery type
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