20 solar energy storage systems from a total of 14 manufacturers have been evaluated by the HTW Berlin University of Applied Sciences in the latest edition of its storage test. New additions in the 2024 Energy Storage Inspection: eight hybrid inverters and eight battery storage systems, including so Contact online >>
20 solar energy storage systems from a total of 14 manufacturers have been evaluated by the HTW Berlin University of Applied Sciences in the latest edition of its storage test. New additions in the 2024 Energy Storage Inspection: eight hybrid inverters and eight battery storage systems, including some from Dyness, Goodwe, Hypontech, Kostal and Pylontech. The Solar Storage Systems research group attested 16 home storage systems a high energy efficiency. Only three devices were not convincing due to high conversion and standby losses
This year, the Energy Storage Inspection is comparing the conversion efficiency of several inverters at very low loads using additional laboratory tests conducted by the Austrian Institute of Technology (AIT) and the Karlsruhe Institute of Technology (KIT). The importance of this: at nighttime, and therefore over several thousand hours a year, the household electricity consumption is typically between 100 W and 300 W. A comparison of several 10 kW inverters with a power output of 200 W reveals considerable differences: while the hybrid inverter Power Storage DC 10.0 from RCT Power stood out with a partial load efficiency of 92 %, the device with the lowest conversion efficiency in the test achieved an efficiency of merely 71 %.
If this less efficient inverter is to supply 200 W to the electrical consumers in the house, the battery storage system must therefore be discharged with 282 W. This means that conversion losses of 82 W occur in the inverter. The losses of a high-efficiency inverter are only 17 W. „Put simply, the higher the inverter efficiency, the greater the benefit of the battery storage system,“ emphasizes Johannes Weniger, initiator of the Energy Storage Inspection. The authors of the study advise households with a low nighttime electricity consumption to choose an inverter with a high partial load efficiency.
The Energy Storage Inspection 2024 was developed as part of the „Perform“ project, which is funded by the Federal Ministry of Economic Affairs and Climate Action (BMWK).
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In just the past ten years, the cost of electricity from solar has fallen by 87 percent, and the cost of battery storage by 85 percent. Wind power, heat pumps and other fossil-free technologies are also experiencing a sharp drop in prices. A study now compares the corresponding findings from innovation reports with the standard model-based scenarios on climate transition. It shows that, although the fight against global heating remains an enormous political challenge, new, cheaper pathways are opening up. The study was led by the Berlin-based climate research institute MCC (Mercator Research Institute on Global Commons and Climate Change) and published in the renowned journal Energy Research & Social Science.
The research team concludes that a good quality of life can be achieved with significantly less energy input. "Some calculations even suggest that the world''s entire energy consumption in 2050 could be completely and cost-effectively covered by solar technology and other renewables," reports Felix Creutzig, head of the MCC working group Land Use, Infrastructure and Transport, and lead author of the study. "This is an extremely optimistic scenario – but it illustrates that the future is open. Climate science, which provides policymakers with guidance in its scenario models, must reflect technical progress as closely as possible. Our study is intended to provide input for this."
According to the study, the climate transition might proceed differently than expected. Currently, in scenarios compatible with the Paris Agreement (i.e. with global heating well below 2 degrees Celsius), it is expected that a lot of coal will continue to be burned in the future, and the resulting CO2 will be captured and stored underground. The extensive burning of biomass (wood pellets, biogas and fast-growing plants cultivated on so-called climate plantations), combined with carbon capture and storage, is also anticipated, despite negative consequences for food production and biodiversity. But the research team is gathering evidence that fossil-free alternatives could become the gamechangers instead.
"Greenhouse gas emissions are higher than ever and the measures taken so far are too weak, but in this politically difficult situation, technological progress provides a ray of hope," says Jan Minx, head of the MCC Applied Sustainability Science working group and one of the co-authors. "New scenario models, some of which are starting to be explored, are likely to demonstrate in the foreseeable future that the global climate transition might not be as expensive as previously assumed, and may even be cost saving – provided it is finally tackled."
Reference of the cited article: Creutzig, F., Müller-Hansen, F., Hilaire, J., Minx, J., Nemet, G., 2023, Technological innovation enables low cost climate change mitigation, Energy Research & Social Sciencehttps://authors.elsevier /a/1hoOs7tZ6Z-FZb
Storage units for solar power greatly increase the availability of generated electricity. Installations of solar power arrays on private homes had grown fast in the past year as a result of the energy crisis. According to BSW Solar, storage capacity in the country should increase from about 6.7 gigawatt hours in early 2023 to 55 gigawatt hours by 2030 to compensate for the generation fluctuations of weather-dependent renewables.
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