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

Mail: info@steca.com
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Electronics services
Electronics, Development Services

Fon: +49-(0)8331-8558-240
Fax: +49-(0)-8331-8558-131

Mail: Michael.Ackers@steca.com
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Solar and Energy
Solar electronics,
Battery charging systems

Fon: +49-(0)8331-8558-100
Service: +49-(0)8331-8558-833
Fax: +49-(0)-8331-8558-132
Mail: info@stecasolar.com
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Solar Charge Controllers

control the entire energy flow in solar home systems

As a central control element in off-grid photovoltaic systems, Steca solar charge controllers control the entire energy flow while ensuring optimal battery maintenance. The products developed and manufactured by Steca ensure extremely low costs due to their long service lives. Steca solar charge controllers and sine wave inverters are the best choice for a modern and professional power supply – all over the world.

General recommendations for the selection of the solar charge controller

The solar charge controller is the central component of an island system. It regulates the energy flow in the entire system and is decisive for its function and service life. A suitable solar charge controller must therefore be carefully selected. The cost share of the solar charge controller measured against the total costs of an island system is only 3 to 5 %. However, it is the most important component for the system. A high-quality and reliable solar charge controller of a higher price class pays for itself very quickly, as it contributes significantly to a long battery life and thus significantly reduces the overall costs of the system.

Selection of topology

Steca solar charge controllers are available as professional hybrid shunt controllers, as serial charge controllers or as MPP trackers. Depending on the requirements of the application, the appropriate topology should be selected. Switching charge controllers such as shunt and serial charge controllers can only be used for 12 V systems in conjunction with 36 cell solar modules. For 24 V or 48 V systems, two 36 cell (24 V) or two 72 cell (48 V) solar modules must be connected in series to form a string. Serial charge controllers are well suited for small applications and solar home systems. For larger applications and hybrid systems, shunt controllers are recommended as they have a lower power dissipation when charging. Due to their good electromagnetic compatibility, shunt controllers are also recommended for telecommunications applications. A solar charge controller with MPP tracking must be used if solar modules that are not made up of 36 or 72 cells are used. This includes most solar modules optimized for grid-connected systems and all thin-film modules. The lower the average annual temperature and the more important efficient charging is at low battery levels, the more advisable it is to use an MPP tracker, even if 36-cell standard modules are used.

Design of the solar charge controller

When designing switching charge controllers, the short-circuit current (Isc) of the solar modules is the decisive factor (under STC conditions). Steca generally recommends designing the solar charge controller generously. The nominal current of the solar charge controller should be approx. 20 % above the sum of the short-circuit current of all connected solar modules.

User interface

If the solar charge controller is used in an application in which people live with the system, it is important that it has a large LC display that shows the operating states via symbols. The solar charge controller should be equipped with an integrated energy meter to inform the user about the system and how it is used. For purely technical applications, such as night light systems, a solar charge controller with a simple LED display is sufficient.

Cables and construction

In order to ensure a long service life, it is important to use solid solar charge controllers and connect them to the battery via short, thick cables. The device should always be screwed directly above the battery to a non-combustible wall. It is important that there is enough free space around the solar charge controller so that it can be sufficiently cooled by the ambient air. In any case, the regulations in the operating instructions must be observed.

Additional functions

In applications with stand-alone inverters or in hybrid systems, it makes sense to use solar charge controllers with additional functions. A connection possibility to the stand-alone inverters for communication and coordination of the devices is a prerequisite for an effective inverter or hybrid system. Furthermore, special functions for energy management are of central importance for hybrid systems.



Steca Solsum 0606 picture.jpg

Steca Solsum

0606, 0808, 1010
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Steca Solarix PRS.jpg

Steca Solarix PRS

PRS 1010, PRS 1515, PRS 2020, PRS 3030
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Steca Solsum.jpg

Steca Solsum

2525, 4040
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Steca Solarix MPPT.jpg

Steca Solarix MPPT

3020, 5020
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Steca PR.jpg

Steca PR

1010, 1515, 2020, 3030
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Steca Solarix.jpg

Steca Solarix

2525, 4040
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Steca PR 2020 IP.jpg

Steca PR 2020 IP

IP 65 Version
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Steca Solarix 2020 2x.jpg

Steca Solarix 2020-x2

Dual battery charge controller
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Steca Tarom.jpg

Steca Tarom

4545, 4545-48
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Steca Tarom MPPT.jpg

Steca Tarom MPPT

6000-S, 6000-M
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Steca Power Tarom

2070, 2140, 4055, 4110, 4140
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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
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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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