Service and contact


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

Your query always in the right hands

Please contact KOSTAL Installer if you

  • Have questions about your PV system (whether private or for your company).
  • Have questions about a KOSTAL inverter.
  • Have questions about a KOSTAL Energy Meter.
  • Have questions about your KOSTAL wallbox.
  • Want to report a fault.

Please understand that KOSTAL cannot accept queries of this kind. Learn more!

Find a KOSTAL installer near you.

You are welcome to contact KOSTAL Solar Support if you

  • Have questions about the KOSTAL monitoring tools (Solar App, Solar Portal).
  • Have questions about Smart Warranty activation in the KOSTAL Solar webshop.
  • Have questions about designing with KOSTAL Solar Plan.

As a system operator, you can reach KOSTAL Solar Support by phone at:

+49 761 477 44 100
Mon to Thu: 8 am to 12.30 pm and 1.30 pm to 5 pm
Fri: 8 am to 3 pm

Please also feel free to use our contact form.

You can find the serial number of your device here.

Contact details