KOSTAL installer portal: good, comprehensive advice

Anyone purchasing a solar system expects good quality and performance. Our KOSTAL customer service team is on hand to answer any questions about our KOSTAL inverters. Fast, uncomplicated and personal.

KOSTAL service for installers: all advantages and services at a glance

Service & support: KOSTAL customer service - always there for you

KOSTAL Solar Academy: Seminars and webinars

KOSTAL Video-Tutorials mit Tipps für einfache Installation und Inbetriebnahme der Wechselrichter

The KOSTAL video tutorials make it very easy to install inverters

Take part: KOSTAL programme for certified installers

Wholersale overview: You will find the wholesaler you trust here

Planning photovoltaics: System design made very easy with the KOSTAL Solar Plan

Service hotline and contact

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

  • General technical advice and warranty processing
  • Support for system planning using the KOSTAL Solar Plan configuration software
  • Help with commissioning
  • Support for system analysis and advice on configuring system monitoring

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

Service Code

The service code (formerly PARAKO code) for PLENTICORE and PIKO IQ inverters can be used to adjust the system-specific switch-off limits according to the grid operator's requirements. As the system operator is not permitted to change the settings on the inverter, access to the settings on the web server (for PLENTICORE and PIKO IQ) or the parameterisation software (for PIKO 4.2 - 36) is protected by a personal password. As an installer, you can find this service code in your user account (under "My profile") of the KOSTAL Solar Terminal.
  1. If you are already registered as a user in the KOSTAL Solar Terminal, you can view your service code in your profile at any time. Please note that you need the "Installation" role for this. If you are not yet registered as an installer, please ask your company's admin to assign you the appropriate role.
  2. Your company is already registered as a customer in the KOSTAL Solar Terminal and you would like to register as an employee? Then please contact the administrator in your company. They will invite and add you as an employee. Please note that you will be assigned the "Installation" role. In this way you will receive your personal service code.
  3. If you and your company are not yet registered in the KOSTAL Solar Terminal, please register your company for the KOSTAL Solar Terminal for the first time. With this registration, you become the administrator for the KOSTAL Solar Terminal within your company and can add other people within your company to the KOSTAL Solar Terminal with an invitation. To view the service code in your profile, the role "Installation" must be assigned.


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 in our free KOSTAL Solar Portal, please interrogate the log data from the device.

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

Photovoltaic planning

Our free KOSTAL Solar Plan software simplifies the inverter layout process.

KOSTAL Solar Plan: inverter layout made easy

Just enter the system data and individual customer data and receive a recommendation for a KOSTAL inverter tailored to the solar system you're planning. All solar and hybrid inverters are taken into account.

The customer's power consumption is also considered and, using standard load profiles, the potential for self-consumption and self-sufficiency is indicated.