How to apply for SPS Programmierer EZA-Regler (m/w/d) - 1KOMMA5° Commercial & Industrial Solutions

About 1KOMMA5°

1KOMMA5° builds CO2-neutral buildings using decentralized clean energy, mobility, and heat solutions. Its Commercial & Industrial Solutions division helps German industrial and commercial companies move to CO2 neutrality with PV, storage, charging, and energy management systems. This is a chance to work on New Energy infrastructure at industrial scale, not just residential projects.

About the role

You program and parameterize certified EZA controllers and park controllers for large commercial and industrial PV and storage plants, mainly in Structured Text according to IEC 61131. You implement complex control concepts like active and reactive power management, Q(U) control, and voltage statics at the grid connection point under VDE-AR-N 4110 and 4120. You also connect controllers to grid operator interfaces using telecontrol protocols and support certification and commissioning.

A typical day

A typical day likely includes writing or adjusting ST code for EZA or park controllers, testing control logic against VDE-AR-N 4110 and 4120 requirements, and coordinating with grid operators or certification bodies. You may also prepare for or support remote and on-site commissioning of commercial PV and storage plants. Exact routines and team structure are not specified, so ask about daily workflows, team setup, and how projects are assigned.

Who 1KOMMA5° is looking for

• Strong hands-on experience programming PLCs in Structured Text per IEC 61131, ideally in the energy or power systems sector
• Working knowledge of VDE-AR-N 4110 and 4120, including active and reactive power management, Q(U) control, and voltage statics at the grid connection point
• Experience with telecontrol and grid operator interfaces: IEC 60870-5-101/104 and Modbus TCP/RTU, plus Redispatch 2.0 processes
• Familiarity with FGW guidelines such as TR8 and the certification process for Anlagenzertifikat and Konformitätserklärung, including coordination with certification bodies
• Willingness to travel for remote and on-site commissioning of large PV and storage plants

Tips for this application

• State directly in your CV or cover letter which VDE-AR-N 4110 and 4120 projects you have worked on, including plant size and your specific role.
• List the exact protocols you know (IEC 60870-5-101/104, Modbus TCP/RTU) and describe one concrete project where you implemented them.
• Name the PLC platforms and engineering tools you have used for Structured Text programming, and mention any experience with EZA or park controllers by name.
• Describe your involvement in certification processes, including any contact with certification bodies and work on Anlagenzertifikat or Konformitätserklärung.
• Confirm your availability for remote and on-site commissioning, since the role explicitly includes both, and note any relevant travel experience.

What to cover in your cover letter

['Concrete examples of EZA or park controller programming in Structured Text for commercial or industrial PV and storage plants.', 'Your direct experience with VDE-AR-N 4110 and 4120 control concepts, including Q(U) control and voltage statics at the grid connection point.', 'Your work with telecontrol protocols and Redispatch 2.0, and how you connected controllers to grid operator interfaces.', 'Your role in certification or commissioning, including any FGW TR8 work and coordination with certification bodies.']

Research before applying

• Review 1KOMMA5° Commercial & Industrial Solutions and how it differs from the company's residential offerings, including the types of industrial and commercial clients it serves.
• Check current German grid code requirements under VDE-AR-N 4110 and 4120 and how they apply to PV and storage plants above 135 kW.
• Look up Redispatch 2.0 rules and the role of EZA controllers and telecontrol in those processes.
• Read up on FGW TR8 and the certification steps for Anlagenzertifikat and Konformitätserklärung so you can speak to the process in detail.

Likely interview topics

Based on the job description, expect questions about:

• How you structure and test ST code per IEC 61131 for EZA or park controllers, and how you handle parameterization for different grid codes.
• Your approach to implementing Q(U) control and voltage statics at the grid connection point under VDE-AR-N 4110 and 4120.
• Which telecontrol protocols you have used in practice and how you handled a specific integration with a grid operator.
• Your experience with Redispatch 2.0 and how you translated the requirements into controller logic.
• How you prepared and supported an Anlagenzertifikat or Konformitätserklärung, including your interaction with certification bodies under FGW TR8.

Common mistakes to avoid

• Listing PLC skills without naming the programming language or standard, such as Structured Text per IEC 61131.
• Claiming experience with VDE-AR-N 4110 or 4120 without giving a concrete project example, plant size, or your specific tasks.
• Ignoring the certification and commissioning parts of the role, since the job description lists both as core responsibilities.