Bullfinch customer service
NEW:
Information for customers of Yello Solar GmbH, DZ-4 Betriebsgesellschaft I mbH and DZ-Betriebsgesellschaft II mbH can be found below.
With over 10,0000 existing systems, Bullfinch Asset AG is one of the largest service providers and financiers for solar and battery systems in Germany.
In the service area, we take care of all customer concerns on behalf of the following companies, from contractual issues and rent collection to maintenance and repair:
- Deutsche Energie Infrastruktur I GmbH (new company for customer contracts that originally existed with Yello Solar GmbH, DZ-4 Betriebsgesellschaft I mbH and DZ-4 Betriebsgesellschaft II mbH and were transferred to this new company)
- DZ-4 Betriebsgesellschaft III mbH
- DZ-4 Betriebsgesellschaft IV mbH
- DZ-4 Betriebsgesellschaft V mbH & Co. KG
- DZ-4 Betriebsgesellschaft VI mbH
- Ecotresor24 GmbH
- Eigensonne Solarmiete GmbH & Co. KG
- Lux23 GmbH
- Solar-SPV 1 GmbH
Our chatbot can help you in real time. Open the chat window at the bottom left and ask your question. The chatbot is connected to our knowledge base and can answer your question competently or recommend an article.
Helpdesk articles
You can of course also browse through all the articles in our knowledge base yourself. Click on this link: Solar Service Desk.
Service tickets
If you want to create a service ticket to receive a qualified response from an employee within 7 days, simply tap "Create service ticket" in the chatbot at the bottom left and follow the steps shown.
Phone number
If you prefer to contact us by phone, you can reach us from Monday to Friday 9 a.m. - 5 p.m. on 069 / 950 648 670. Please bear in mind that our telephone team is generally unable to offer a direct solution. The team will be happy to take your query and forward it for internal processing. You will then receive feedback within 7 days.
Questions and answers on the takeover of rental systems of Yello Solar GmbH and other companies by Deutsche Energie Infrastruktur I GmbH
What is the background to the takeover?
Greenfinch GmbH & Co. KG ("Greenfinch") has taken over the customer contracts and associated assets for solar rental systems previously held by Yello Solar GmbH, DZ-4 Betriebsgesellschaft I mbH and DZ-4 Betriebsgesellschaft II mbH. Greenfinch specializes in investments in renewable energies and thus ensures the long-term maintenance of all acquired solar rental contracts.
From a legal point of view, all plants of Yello Solar GmbH, DZ-4 Betriebsgesellschaft I mbH and DZ-4 Betriebsgesellschaft II mbH were transferred by universal succession to the newly founded operating company, Deutsche Energie Infrastruktur I GmbH, which was acquired by Greenfinch in the course of the transaction.
Will my contract remain valid?
Yes, your solar rental contract and all contractual conditions remain unchanged. The amount of the solar rent will not change.
Has my contractual partner changed?
Yes, your contractual partner is now the newly founded Deutsche Energie Infrastruktur I GmbH. It has taken over your rental agreement with all associated rights and obligations.
Do I have to agree to the transfer of the contract?
No, consent is not required as all contracts were automatically transferred to Deutsche Energie Infrastruktur I GmbH (statutory universal succession).
Do I have a special right of termination as a result of the takeover?
No, there is no special right of termination, as neither a contractual nor a statutory special right of termination applies in this case.
Is a new SEPA mandate now required?
No, we do not need a new SEPA mandate from you.
Will anything else change?
We strive for a seamless transition of all services so that as little as possible changes for you.
Your automatic rent collection will continue to take place on the same date each month as usual and from November 2025 will simply be collected into a different target account. We have informed you of the new target account separately by e-mail and letter.
Due to different booking systems between your old and new contractual partner, in individual cases the amount collected may be 1 cent higher or lower than before due to rounding.
If you transfer your rent yourself, the target account will also change here. Please transfer your monthly rent from November 2025 to the new target account that we have notified you of by e-mail and letter. You are also welcome to switch to SEPA direct debit if you send us a short message (see contact details above).
What happens to my personal data?
Your personal data required for the fulfillment of your contractual relationship (e.g. name, address, bank details, system data) has been securely transferred to Deutsche Energie Infrastruktur I GmbH within the framework of the statutory universal succession. The protection of your data is our top priority. All data will of course be treated strictly in accordance with the provisions of the General Data Protection Regulation (GDPR). Your previous contact for services, Bullfinch Asset AG, will remain active as a contracted service provider under an order processing agreement and will also have access to the data required to provide the service.
What happens to the guarantees and warranty for my system (e.g. for modules, inverters)?
All existing manufacturer's warranties and statutory warranty claims are transferred unchanged to Deutsche Energie Infrastruktur I GmbH. Should a component of your system fail, we will take care of repair or replacement as usual within the scope of the contractual conditions.
What happens if I have a problem with my solar system? Who can I contact?
You are welcome to continue to contact us with your concerns. We, Bullfinch Asset AG, are still in charge of all services related to your solar installation.
As described above in the general section, you can ask our chatbot for immediate assistance, browse our helpdesk articles, create a service ticket or contact us by phone.
Which general arbitration procedures do you take part in?
It is always our aim to reach an amicable settlement in direct discussions with our clients. For this reason, we do not participate in any general arbitration proceedings for the companies we support (see above). The only exception is Ecotresor24 GmbH, for which we participate in the arbitration procedure of the Bundesbank's arbitration board. The address of the Bundesbank's arbitration board can be found here:
Deutsche Bundesbank
Wilhelm-Epstein-Straße 14
60431 Frankfurt am Main
Tel.: 069 9566-33232
Fax: 069 709090-9901
Internet: https://www.bundesbank.de/de/service/schlichtungsstelle