From inverter faults and missing monitoring data to problems with your grid operator: we track down the fault on existing PV systems – including those installed by other companies – and make sure they run again. We plan new PV systems, battery storage and backup power for homes, businesses and farms to match your consumption.
Based in the Allgäu, working across Upper Bavaria. Larger projects throughout Germany by arrangement.
You speak directly to the service technicians who will work on your system. We respond within 48 hours on working days.
Services
Our focus is servicing existing PV systems. On top of that, we handle projects involving storage, backup power and electrical work.
Is your system producing too little power, showing an error or missing from the monitoring portal? We find the cause – whether the problem is the inverter, data logger, cabling, network or settings – and make sure it gets fixed. Including systems installed by other companies.
Received a letter from your grid operator about remote control, telecontrol or new requirements? We check the equipment and connections, fix communication faults and coordinate directly with your grid operator.
We plan new PV systems for homes, businesses and farms, plus battery storage, emergency and backup power, off-grid systems and extensions. And we help when the 20-year EEG feed-in tariff ends. We develop our battery storage systems in-house, for new and existing installations.
Need more than PV service? We also take care of:
One point of contact for electrical work and excavation – so you have less to coordinate.
Common problems
The monitoring portal shows no data, the inverter has lost its connection or remote access no longer works.
We check the network, data logger, communication modules and settings to restore the connection.
Error messages, unexpected shutdowns and falling yields can have several causes.
We test the system, identify faulty components and explain what needs repairing or replacing. After the visit you receive a written service report.
A failed telecontrol connection, control box or ripple control receiver can quickly lead to formal letters and deadlines.
We check what is required, get the communication working and coordinate with the grid operator.
Not sure what’s wrong? Just tell us what you’re seeing. A photo of the error message or the letter you’ve received is often enough to get started.
Report a problemAbout us
Technik-Service Rethwisch is two electricians from the Allgäu who have worked together since vocational school. When you call, you speak to the people who assess the problem and work on your system. No call centre, no changing contacts.
Languages: GermanEnglish
Languages: GermanPolishEnglish
Member of the Chamber of Industry and Commerce for Munich and Upper Bavaria.
The person who advises you also works on your system – and stays reachable on the same number.
We develop battery storage and heating controls ourselves. That’s why we know them inside out.
You receive a written record of what we found and did – for you, the grid operator or your insurer.
How it works
By form, phone or WhatsApp: where is the system, and what is happening? Photos of error messages, type plates or grid operator letters are helpful.
We respond within 48 hours on working days, review the information and discuss the next steps. If needed, we arrange an on-site visit.
We test the system and fix faults in the data connection and settings on site where possible. For larger jobs, you receive a quote beforehand. At the end, you get a written record of the work.
Our work
Checking inverter and communication equipment to identify the cause of a fault.
Tracking down faulty modules on an existing installation and organising their replacement.
Preparing cable routes and connections for PV and electrical equipment.
FAQ
Yes. Servicing systems installed by other companies is a major part of our work. If available, send us the system documents, the inverter model and the latest error message.
Not necessarily. The fault is often in the internet connection, the data logger or the monitoring equipment. We check whether the system is generating power and find out why the data is missing.
Yes. Send us a copy of the letter. We review the requirements, check the equipment and coordinate the technical response with the grid operator.
Often, yes. We first check the existing inverter, the electrical installation and your power requirements and plan a suitable solution.
Our business is based in Igling. We regularly work in the Allgäu and across Upper Bavaria. We take on larger projects throughout Germany – and elsewhere in Europe by arrangement.
Contact
Tell us what’s happening or what you’re planning. We’ll get back to you within 48 hours on working days.
We’ll get back to you within 48 hours on working days. Urgent? Call us: +49 151 19600684
