KOSTAL service – guaranteed. Tailor-made. Keeping the customer satisfied.

Get even more out of your KOSTAL solar inverter by making use of our comprehensive warranty and other services.

Each one of our 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.

Take service by its word, give us a call!

Our Service team is available by telephone to answer all your questions before and after your purchase, for example:

  • General technical advice
  • Support with system planning using the KOSTAL (PIKO) Solar Plan configuration software
  • Adjustment of grid parameters using the PARAKO software
  • Help with commissioning
  • Support with system analysis
  • Advice on configuring system monitoring
  • Warranty processing

Call the service hotline on +49 761 47744-222 (Mon – Fri from 8:00 a.m. to 5:00 p.m.) or get in touch via our contact form.


With the KOSTAL Smart Warranty, you get a three-year manufacturer's warranty and can also extend the warranty even further!

Smart Warranty

Benefit from the Smart Warranty: By registering on the KOSTAL Solar webshop, your warranty will be extended to 5 years free of charge. We are gifting you a 3-year manufacturer's warranty. This applies to all devices of the PLENTICORE plus, PIKO MP plus, PIKO IQ, PIKO 10-20 and PIKO 36 EPC series.

It's that simple:

Step 1: Log in to your user account
Step 2: Select KOSTAL Smart Warranty
Step 3: Enter the commissioning date, serial number, system data and location data
Step 4: Confirm registration data
Step 5: Warranty certificate received immediately by e-mail

The legal warranty isn't affected by the warranty service. Our services covered by the warranty include a rapid exchange service to ensure that your PV system is back up and running in no time. We will organise the collection of your defective device and we will also cover the freight costs incurred for this.

Extension of warranty

It's possible to extend the inverter’s warranty by 5, 10 or 15 years within the first two years of purchase. You can now order this warranty extension conveniently and easily via our KOSTAL Solar webshop .

This offers you several advantages:

  • The process is simple and fast because you no longer have to apply for the warranty extension
  • Can be ordered 24/7
  • Warranty certificate (PDF) sent immediately by e-mail

Service enquiries

You can submit a complaint outside our hotline opening hours. Please complete the questionnaire and send it to us, together with the log data, as an attachment to our contact form. If the inverter isn't included on our free KOSTAL (PIKO) Solar Portal, please interrogate the log data from the device.

Great news: Your request will be treated as a priority.

Service code/PARAKO password request

The system-specific shutdown limits can be adapted to the grid operator's requirements using the PARAKO parameterisation software or the service code for the PLENTICORE plus and PIKO IQ inverters. Since the plant owner isn't allowed to change the settings on the inverter, the parameterisation software is protected by a different password for each individual. 
Before such a password can be allocated, we, KOSTAL Solar Electric, need you to confirm that you're an electrician from an authorised specialist company and that you will not disclose the password to the system owner. Therefore, please download the registration form, fill it out, scan it in and return it via our contact form.