Service and contact


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

Your query is in the right hands with us

Please contact KOSTAL Solar Support if you

  • Have general technical questions about our products
  • Wish to report a fault with a KOSTAL product
  • Have questions about KOSTAL monitoring tools (Solar App, Solar Portal)
  • Want to design a PV system with KOSTAL Solar Plan
  • Have any questions about the warranty/free KOSTAL Smart Warranty activation
  • Are interested in a Certified Installer partnership
  • Would like to order brochures and print media
  • Are interested in our training sessions
  • Would like to subscribe to the KOSTAL KONNEX newsletter

If available, please have your KOSTAL customer number ready for your enquiry.

For when things need to be done quickly: KOSTAL quick links

  • You can record a fault using the reporting form here. For PIKO CI series please use click here.
  • Video instructions for installation, activating a Smart Warranty or registering in the Solar Portal can be found here
  • You can register here to become a Certified Installer
  • You can order brochures and print media to pass on to your customers here
  • For KOSTAL seminars and webinars, please register here
  • For the KOSTAL KONNEX newsletter, please register here
  • You can find images of our products here
  • Advertisements for free use in newspapers and magazines can be found here
  • Find the KOSTAL wholesale partner you trust here


As a business customer, 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