Service and contact


Get in touch with us. Either use the form or contact us directly.

Questions, suggestions or problems?

Even with all the quality and care in the world, questions or problems can sometimes arise. Simply contact your professional installer. They will be happy to assist you with your concerns using their expertise.

Please find your installer here.

Your concern

  • Always up to date with the KONNEX newsletter
    For everyone who likes to stay up to date about us and our products, there is our free KONNEX newsletter. Simply register here and receive all the latest information directly by email.

    If you no longer like to receive the newsletter, you can unsubscribe quickly and easily at any time.
  • Installation made easy
    With the KOSTAL installation videos, you will receive the most important information for quick and professional installation of almost all KOSTAL products in a clear and understandable manner - exactly when you need them. And in any location.

    You can find detailed descriptions of the installation in the operating instructions in the download area.
  • For quick problem solving
    If you have a technical problem or a malfunction occurs, please use the complaint form. This is used to get more detailed information. In this way we can find a solution in a targeted manner.
  • Was your request not included? Please use the contact form below.

Contact form

Your query

Here you can find the serial number of your device.

Your contact details

Data protection declaration of consent: I agree that the data I have provided will be collected and stored electronically. My data will only be used strictly for the purpose of processing and answering my enquiry within the scope of the DSGVO. A revocation is possible at any time under the e-mail address . Here you can find our privacy policy.

Service Hotline

Our service staff are available by telephone for all questions before and after the purchase, such as:

  • General technical advice and warranty processing
  • Support in system planning with the help of the KOSTAL Solar Plan design software
  • Help with commissioning
  • Support with system analysis and advice on the configuration of system monitoring

Telephone +49 761 47744-222 (Mon-Fri from 8 a.m. to 5 p.m.)

PV planning with KOSTAL

Find your nearest KOSTAL specialist partner now

Find an installer now

Retrofitting a PV system - with repowering for more efficiency

Perform a retrofit check now

Perfect solar and storage solutions for your PV system

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