Mit Photovoltaik & Heizstab den PV-Überschuss clever nutzen

Mit Photovoltaik & Heizstab den PV-Überschuss clever nutzen

by Felix Goldbach

Applied Sciences & Engineering Energy THVAlternative and renewable energy sources and technologyTHVSSolar power
🎙 Felix Goldbach 👥 84K 📅 September 20, 2025 ⏱ 11 min 👁 104K 📄 documentary 🧭 2026-08-16
Available in: English (current) Français

Keywords

PV surplusheating rodself-consumptionsolar energywater heating

Summary

The video, hosted by Felix Goldbach, explores the use of a heating rod (Heizstab) to utilize surplus photovoltaic (PV) energy for domestic hot water production, as an alternative to feeding electricity into the grid at low or negative prices. Felix visits Nils in Hameln, who has a 17 kWp PV system and a 300-liter hot water tank. Nils explains that he installed a heating rod from novolto, which can be plugged into a standard socket and is controlled via a smart meter (Tibber) to modulate power output based on PV surplus. The system cost around 700 euros (including the rod, adapter plate, and Tibber), with potential additional costs for a plumber. Nils reports saving about 260 euros per year on gas, leading to a payback period of roughly 2.5 to 3.5 years. The video discusses the technical operation, installation, and economic viability, concluding that it is suitable for PV owners looking to increase self-consumption without investing in a battery or heat pump. The video includes a sponsored segment by novolto, and the creator provides affiliate links in the description.

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Critical Evaluation

Value of the Information & Strength of the Argument

The video provides valuable practical insights into a cost-effective method for increasing PV self-consumption. It presents a real-world example with specific data on costs, savings, and payback time, which adds credibility. The argumentation is straightforward: by using surplus PV power to heat water, homeowners can displace gas consumption, which is economically beneficial when feed-in tariffs are low. The video also addresses potential concerns such as installation complexity and electrical safety. However, the economic analysis is simplified, assuming zero feed-in tariff and not accounting for the opportunity cost of not selling electricity. The creator acknowledges this in the comments, noting that the calculation could be adjusted based on actual feed-in rates. Overall, the argument is coherent and persuasive for the target audience of PV owners.

Scientific Rigor, Source Quality, Title Accuracy

The video demonstrates a reasonable level of scientific rigor for a practical guide. It provides specific technical details about the heating rod’s operation, such as its ability to modulate power from as low as 120 watts up to 3 kW, and its compatibility with standard sockets. The creator mentions that the system is controlled via a Tibber smart meter, which is a well-known device. However, the video does not cite external scientific sources or studies; it relies on anecdotal evidence from a single installation. The title accurately reflects the content, focusing on using a heating rod for PV surplus. The video includes a sponsored segment by novolto, which is disclosed, and the creator provides affiliate links, which may introduce bias. The comments section shows a mix of positive feedback and critical points about the economic assumptions, indicating an engaged audience. Overall, the video is informative but could benefit from more rigorous economic modeling and independent verification.

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Title / Content Match

The title accurately reflects the content, focusing on using a heating rod to utilize PV surplus for water heating.

Quality & Reliability

7/10

The video presents a practical case study with concrete data on costs, savings, and installation, but relies on a single example and simplified assumptions (e.g., zero feed-in tariff). It includes a sponsored segment, which may introduce bias, but the technical explanations are coherent and align with common practices.

Chapters

Cited Sources

Concurring Sources

Dissenting Sources

  • Comment by user 'Ralf' — A commenter points out that the amortization calculation should consider the difference between gas price and feed-in tariff, which would extend the payback period significantly. This challenges the video's simplified assumption of zero feed-in tariff.

Contribution & Novelties

The video offers a practical, low-cost solution for increasing PV self-consumption without the need for expensive batteries or heat pumps. It demonstrates a real-world installation with specific cost and savings data, providing a tangible example for homeowners. The use of a smart meter (Tibber) for dynamic control is highlighted, showing how surplus PV power can be efficiently utilized. The video also addresses common concerns such as installation complexity and payback period, making it accessible to a broad audience.

Pour aller plus loin :

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Radar Profile

The radar profile shows a balanced performance across all dimensions, with slightly higher scores in information quantity and quality, reflecting the video's practical and data-driven approach. The technical level is moderate, making it accessible to a general audience, while the overall reliability is good but not exceptional due to the reliance on a single case study and sponsored content.

Reliability 7/10

💬 The overall sentiment is positive, with many viewers sharing their own experiences and praising the simplicity of the solution. Some comments provide constructive criticism on the economic assumptions, but the general tone is supportive and enthusiastic. Sur les 30 commentaires analysés, la majorité exprime un avis favorable et partage des retours d'expérience similaires.