Dieser Batteriespeicher arbeitet ohne Wechselrichter. Rainers ehrliches Fazit

Dieser Batteriespeicher arbeitet ohne Wechselrichter. Rainers ehrliches Fazit

by Felix Goldbach

Applied Sciences & Engineering Energy THYEnergy, power generation, distribution and storageTHYBBattery technology
🎙 Felix Goldbach 👥 84K 📅 December 13, 2025 ⏱ 20 min 👁 49K 📄 documentary 🧭 2026-08-16
Available in: English (current) Français

Keywords

BatteriespeicherMulti-Level-TechnologiePV-AnlageEigenverbrauchAmortisation

Summary

In this video, Felix Goldbach visits Rainer, a homeowner with a 280 m² house, a 10 kWp PV system, an electric car, and a pellet heating. Rainer explains why he initially avoided a battery storage system and why he eventually chose a SAX Power storage unit with Multi-Level technology. The system integrates the inverter directly on the battery cells, achieving high efficiency (claimed 98% round-trip) and allowing him to keep his existing Fronius inverter. Rainer uses dynamic electricity tariffs to charge the battery during cheap nighttime hours and discharge during expensive peak times, saving about 500 euros per year. The total cost was 7500 euros (including a new electrical panel), leading to an estimated payback period of 15 years. The video also discusses the system’s limitations, such as limited sizes (5.8 and 7.7 kWh) and lack of built-in energy management, which Rainer compensates with Home Assistant. The video is sponsored by SAX Power, which is disclosed.

156 words

Critical Evaluation

Value of the Information & Strength of the Argument

The video provides valuable real-world data on the performance and economics of a specific battery storage system. It includes concrete figures on costs, savings, and efficiency, and discusses the rationale behind the choice. The argumentation is balanced, acknowledging both advantages (high efficiency, easy installation, scalability) and disadvantages (high price, limited sizes, lack of integrated control). However, the sponsorship by SAX Power introduces potential bias, and the efficiency claims are not independently verified in the video.

Scientific Rigor, Source Quality, Title Accuracy

The video references a study by HTW Berlin on storage efficiency, but does not provide a direct link. The description includes links to the manufacturer’s product page, a referral for installation services, and other related videos. The title accurately reflects the content. The video is sponsored, which is disclosed, but this may affect objectivity. The technical explanations are clear, but some claims (e.g., 98% efficiency) are challenged by commenters, indicating a need for more precise data.

166 words

Title / Content Match

The title accurately reflects the content, focusing on a battery storage system without a traditional inverter and the owner's honest assessment.

Quality & Reliability

7/10

The video presents a real-world case study with specific data (costs, savings, efficiency) and references to a study by HTW Berlin. However, it is sponsored by the manufacturer, which introduces potential bias. The technical claims are partially verified by user comments, but some efficiency figures are contested.

Chapters

Cited Sources

Concurring Sources

Dissenting Sources

  • Comment on efficiency claims — Several commenters point out that the 98% efficiency figure is only for discharging at high power, and that round-trip efficiency is lower, especially at low power. This contradicts the video's implication of overall high efficiency.

Contribution & Novelties

The video provides a practical, real-world example of a battery storage system using Multi-Level technology, which is relatively new. It highlights the benefits of high efficiency and the ability to retrofit without replacing existing inverters. The owner’s experience with dynamic tariffs and Home Assistant integration offers actionable insights.

Pour aller plus loin :

  • Multi-Level-Technologie — Overview of multilevel converters, the underlying technology.
  • HTW Berlin Stromspeicher-Inspektion — Official study on battery storage efficiency, referenced in the video.
  • Home Assistant — Open-source home automation platform used by the owner for energy management.

90 words

Radar Profile

The radar profile shows high scores in information quantity and quality, but lower in technical depth and reliability, reflecting the practical but somewhat promotional nature of the content.

Reliability 6/10

💬 Équilibré: Sur les 30 commentaires analysés, les avis sont partagés entre enthousiasme pour la technologie et critiques sur le prix élevé et les chiffres d'efficacité contestés.