KOSTAL. By professionals, for professionals.

Strengthening specialist retailers and tradespeople in the long term – and ensuring quality for end customers – that is the essence of KOSTAL’s ‘By professionals, for professionals’ commitment

The installation, commissioning and addition of extra features to KOSTAL inverters and wallboxes form part of a carefully designed system that protects and supports the interests of specialist installers and retailers, as well as end customers, in equal measure. In this way, KOSTAL is sending a clear signal regarding quality, partnership and sustainable value creation in the solar market.

A commitment that guarantees quality – through a specialist contractor

At the heart of this is a simple yet effective measure: the installation and commissioning of PV systems with KOSTAL may only be carried out by authorised and trained specialist installers. Furthermore, any functional upgrades – such as activating the battery function or increasing the inverter’s power output – must be carried out professionally – this is the KOSTAL quality promise.

This protects the end customer from faulty DIY installations and ensures that all functions are implemented in accordance with technical standards, in compliance with regulations and with due regard for grid compatibility. The result: greater safety, greater efficiency, greater confidence.

Focus on skilled trades – how professionals benefit / benefiting from professionals

The KOSTAL Quality Promise supports specialist trades by giving them an exclusive role within the system:

Only certified KOSTAL installers are permitted to install PV systems
The installer remains the central point of contact for planning, implementation and expansion
Certification prevents DIY installations or improper commissioning by third parties
By consolidating the range into a few basic units with optional add-on functions, training and stockholding costs for installers are reduced, whilst maintaining maximum system flexibility

In short: KOSTAL helps specialist contractors achieve greater efficiency, higher margins and better customer loyalty.

Strengthening specialist retailers as a qualified sales channel

KOSTAL also offers clear advantages for specialist wholesalers:
KOSTAL products are sold exclusively through authorised distribution partners. This ensures that specialist retailers remain the central point of contact for installers and play a key role in delivering added value.

This structure protects against the gradual erosion of the value chain by uncertified channels. Furthermore, the use of basic devices with activatable additional functions reduces stockholding and complexity, as a wide range of systems can be implemented using just a few devices.

End customers benefit in two ways: flexibility and quality

KOSTAL offers end customers maximum transparency and flexibility:

KOSTAL products, such as inverters and wallboxes, can be activated as required and within budget – for example, when retrofitting a storage unit at a later date
You only pay for what you use – a fair price-performance ratio
The involvement of qualified installers ensures that all products are installed professionally – in terms of safety, durability and grid compliance

KOSTAL makes it clear: investing in solar means investing in quality, safety and efficiency – at every level.

KOSTAL’s ‘By professionals, for professionals’ commitment

KOSTAL has made a conscious decision to work with specialist retailers and tradespeople: a partnership-based system founded on knowledge, trust and professionalism.

Protecting professional expertise
Enhancing the value of our sales partners
Ensuring customer satisfaction

KOSTAL ensures a future-proof model that strengthens specialist retailers, specialist tradespeople and end customers alike. The clear separation of sales, installation and expansion ensures the quality of the products and supports all stakeholders – from consultation through to purchase and expansion.

KOSTAL connects, protects and inspires – that’s the holistic approach to PV!