Customer service and support from KOSTAL: good advice all round

Anyone purchasing a solar system expects good quality and performance. Together with your installer, KOSTAL customer service will make sure that you're happy.

KOSTAL service – guaranteed. Tailor-made. Satisfying

KOSTAL offers efficient training programmes and comprehensive support to our specialist tradespeople, and you benefit from that! Each of our KOSTAL inverters is a quality product manufactured within the KOSTAL Group and is subject to the same quality standards as, for example, our products for the automotive industry. But it's not only our products that are top quality, but our service too, where our focus is always on ensuring that you, the customer, is satisfied.

If you operate your own system, we recommend contacting your specialist installer as a first point of call if you have any questions. If you're looking for a new installer, please use our installer search.

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Activate for the KOSTAL Smart Warranty and receive additional free warranty

Benefit from the Smart Warranty: By activation on the online KOSTAL Solar shop, you will receive a free warranty. So we give you additional years of cover above and beyond the legal warranty period. This applies to KOSTAL inverters and wallboxes.

Three steps to the KOSTAL Smart Warranty: it's so simple

Step 1: Log in to the online KOSTAL Solar shop
Step 2: Enter system and location data
Step 3: Activate warranty
Done! You will receive the warranty certificate immediately by e-mail.

Real performance - Full service

Our services covered by the warranty include a rapid exchange service to ensure that the PV system concerned is back up and running in no time.

We will organise the collection of the defective device and we will also cover the freight costs incurred for this.

To the webshop

KOSTAL Solar Repower Check

Want more power for the PV system? If you're going to replace your old inverter with a new one, the KOSTAL Solar Repower Check provides you with the right device quickly and easily. Simply enter your current inverter's data into our Repower Check Tool and obtain suggestions of models for your next device.

Perform Repower check now

KOSTAL warranty extension

For our customers who would like to have their inverters protected for even longer, the KOSTAL warranty extension offers an additional extension option. Within the first two years, the warranty period can be extended by a further 5 years from the date of purchase.

The warranty extension can be ordered conveniently from the KOSTAL Solar webshop. This dispenses with unnecessarily long application and processing times. Simple and fast: around the clock and even on weekends. It's quick and easy: the customer receives an e-mail with the warranty certificate attached as a PDF. To order the KOSTAL warranty extension, the customer should be registered in the webshop and the Smart Warranty option should be activated.