progressX

 2021-03-30 #pv, #solar, #inselanlage Dieser Artikel führt den Artikel von 2021-03-28 weiter... Was bisher bei dieser Kleinstanlage auffiel: das PV panel braucht schon eine gewisse direkte Sonneneinstrahlung bis Leistung kommt. Insbesondere in den Abendstunden und trotz das die Sonne noch gut über dem Horizont steht (März, Beginn Sommerzeit, ca. 18:00 MESZ) geht die Leistung rasch herunter. Möglicherweise spielt auch die Panel-Temperartur eine Rolle. Beim Akku/Power Bank fällt auf, dass die Kapazität in den letzten 10-20% bevor er leer ist relativ rasch zusammenbricht. Das erwartet man eigentlich für gebrauchte Akku, nicht jedoch für einen neuen Akku. Heute zwei zusätzliche power banks an das setup angeschlossen, wobei das Original-setup am Vormittag bis Mittag komplett aufgeladen wurde (von unter 20% auf 100% in ca. 4 Stunden). Ab Mittag wurden die zusätzlichen power banks (tiefenentladen angeschlossen). Power bank A via USB C PD, Power bank B via USB A - USB mini. Die power banks...

 2021-03-22 #pv, #solar, #inselanlage Der Gedanke: was gibt es Neues bei kleinen PV Anlagen die jeder, auch der Laie, in Betrieb nehmen kann. Wofür können diese Anlagen genutzt werden. Was kostet es, etc.? Nach einigen Recherchen in diversen Foren [1] und bei online-Händlern, diese Basis-Komponenten bestellt: - Akku: GoalZero Sherpa 100 AC, Kosten ca. CHF 310 [2] - Solarpanel: GoalZero Boulder 50, Kosten ca. CHF 180 [3] Der Akku hat eine Kapazität von 94.7 Wh, verfügt über diverse Schnittstellen sowie einen Steckplatz um den Akku mit einem Stromabnehmer mit zweiphasigen Stromstecker zu verbinden. Das kann z.B. eine Stehlampe oder ein HiFi-Verstärker oder sonst ein Gerät mit < 100 W Leistungsaufnahme sein. Das Solarpanel soll bis zu 50 W Leistung liefern können. Interessante Links: [1] Laptop mit Solarenergie laden: So geht’s Erfahrungsbericht: Den Laptop an einem Solarpanel aufzuladen, hat etwas Magisches Stromausfall oder Camping? Das alles könnt ihr an eine Powerbank anschließ...

a reprint from phys.org , 2018-07-02 Greenhouse gases were the main driver of climate throughout the warmest period of the past 66 million years, providing insight into the drivers behind long-term climate change. Antarctica and Australia separated around the end of the Eocene (56 to 22.9 million years ago), creating a deep water passage between them and changing ocean circulation patterns. Some researchers believe these changes were the driver of cooling temperatures near the end of the Eocene 'hothouse' period, but some think declining levels of carbon dioxide were to blame. If the cooling had been caused by changes in ocean circulation, regions around the equator would have warmed as the polar regions cooled, shifting the distribution of heat on Earth. But changing the concentration of greenhouse gases would affect the total heat trapped in Earth's atmosphere, causing cooling everywhere (including in the tropics), which is what the researchers found. The findings ...

a reprint from the economist , 2018-06-25 A LITTLE over a decade ago, when JinkoSolar, a Shanghai-based company, entered the solar business, it was such a novice that when it visited international trade fairs, all it had was a bare table and a board with its name scribbled on it. But it also had luck, a technological edge and lots of public money on its side. The industry globally was riding high on subsidies. Generous feed-in-tariffs (FITs), financial incentives for installing solar, made Germany the world’s largest solar market by around 2010. Germans turned to China for cheap sources of crystalline silicon solar panels, not least because subsidised land and loans enabled China’s fledgling manufacturers to undercut European and American competitors. When European solar subsidies slumped during the euro crisis, the Chinese government once again stepped in to support its renewable-energy champions. It offered FITs to slather the remote west of China with solar farms. By 2013 C...

  reprint (by W. Scharnhorst ) Divestment of stocks in fossil fuel companies may seem like a good idea if the goal is to put financial pressure on conventional energy companies and thereby leave an opening for cleaner alternative fuels in the fight against climate change. The question is whether the strategy works. Certainly any company, whose core business is making money, is likely to take notice of any activity that affects its revenues. Yet many argue that a drop in investment in an energy company may not be the best way to get its attention, especially at a time when alternative energies are scarce and fossil fuels remain the dominant source of power . In other words, how many people today can afford to junk their gasoline-powered cars and invest in more expensive electric models? That’s exactly the point made by London Mayor Boris Johnson, a member of Britain’s Conservative Party who also harbors libertarian, if not liberal, political views. The London Assembl...

  reprint New analysis from Climate Policy Initiative (CPI) and the Indian School of Business shows that, with the appropriate policies, the Budget 2015 target of 60 GW of wind power by 2022 can easily be met with minimal government financial support. In the report, Reaching India’s Renewable Energy Targets Cost-Effectively, CPI found that, in absence of any subsidies, wind power is already cheaper than the total cost of power from a new build imported coal plant, at INR 5.87/kWh for electricity from wind power and INR 6.81/kWh for electricity from imported coal. The comparison with imported coal is key because this is the fuel that additional renewable energy will likely replace, rather than domestic coal or natural gas , which are limited in supply. The analysis also finds that wind power will continue to remain competitive beyond 2022. Because the government has a constrained budget, a cost-effective policy path to achieving its renewable energy targets is crucial. These findin...

reprint In an industrial park on the outskirts of Pullman, Wash., 10 white storage trailers sit side by side, neatly arranged in two rows. These are no ordinary storage units. Arranged on racks inside are the guts of a large rechargeable battery, the kind of device that can store and release utility-scale amounts of electricity. But this is no ordinary storage battery , either. In contrast with the typical lead-acid batteries used to start car engines or the lithium-ion cells that power electric vehicles — both of which are largely solid — this battery is mostly liquid. The chemicals that react to produce electricity are dissolved in water and circulated into and out of the heart of each cell, where the reaction occurs. For that reason, it is called a flow battery, and the one in Pullman, a demonstration project that will be tested over the next year and a half, is one of the largest in the world. It can store about 3.2 megawatt-hours of energy and discharge a megawatt of power for ov...

reprint Eighty miles east of Palm Springs, California, eight million solar panels lean toward the sky, their deep blue shine a modern oasis interrupting the brown dust of the Mojave Desert. Known as Desert Sunlight, the solar power plant is the first of its kind and promises to provide 550 megawatts (MW) of clean energy powering over 150,000 homes in California (a few percent of the state's total power consumption). Such large amounts of power from one, 3000-acre solar installation have been unheard of until now, hinting at a revolution in _progress | M replaces _kt75 | mirror. visit: http://progress-m.blogspot.com . ready: 01.07.2015. close ✕ For 2013 — Installed More Solar Power In 2013..." href="http://kt75-mirror.blogspot.ch/2014/01/chinas-solar-market-beat-all.html" target="_blank">large-scale renewable energy generation that could compete with fossil-fuel-based power plants. Not so fast, say Native American tribes and environmentali...

reprint Eighty miles east of Palm Springs, California, eight million solar panels lean toward the sky, their deep blue shine a modern oasis interrupting the brown dust of the Mojave Desert. Known as Desert Sunlight, the solar power plant is the first of its kind and promises to provide 550 megawatts (MW) of clean energy powering over 150,000 homes in California (a few percent of the state's total power consumption). Such large amounts of power from one, 3000-acre solar installation have been unheard of until now, hinting at a revolution in large-scale renewable energy generation that could compete with fossil-fuel-based power plants. Not so fast, say Native American tribes and environmentalists, who protest these solar plants due to their impact on sacred heritage lands and native species. The ongoing debate shines an important light on the fact that renewables introduce unique environmental and cultural impacts. These issues may rest in a blind spot for policy...

reprint A major new Deutsche Bank report has predicted that energy storage – the “missing link of solar adoption” – will be cheap enough – and technologically ready – to be deployed on a large-scale within the next five years. The solar industry report, published on Friday, said that while costs for the greater majority of available battery technologies remained prohibitive, economically competitive batteries were the “killer app” and the “holy grail” of solar penetration. But with many costs already lower than published literature would suggest, Deutsche Bank believes this ultimate solar and renewable energy goal might not be far out of reach. “Using conservative assumptions and no incentives, our model indicates that the incremental cost of storage will decrease from ~14c/kWh today to ~2c/kWh within the next five years,” the report says. “When overall system cost decreases are considered, we believe solar + batteries will be a clear financial choice in mature solar ma...

-- a _kt75 | reprint _NEW: explore all _kt75 | publications via the news db... and leave your comments here The ECOWAS Renewable Energy and Energy Efficiency Status Report, produced collaboratively by REN21 and ECREEE with lead authorship from the Worldwatch Institute, provides a regional perspective on the renewable energy and energy efficiency market and industry development in West Africa. Launched on November 10, 2014, the report concludes that renewable energy and energy efficiency technologies have rapidly become cost effective solutions for overcoming the diverse energy challenges facing the ECOWAS region (Benin, Burkina Faso, Cabo Verde, Côte d'Ivoire, The Gambia, Ghana, Guinea, Guinea-Bissau, Liberia, Mali, Niger, Nigeria, Senegal, Sierra Leone, and Togo). "It is clear that the ECOWAS Member States acknowledge the enormous potential that renewables and energy efficiency bring to accelerating energy access and meeting the region's energy needs," s...

-- a _kt75 | reprint Download: Quarterly Notes on Sustainable Water Management - Q01/2014 There is a boom in renewable energy sources coming online worldwide, but the predominant types – solar and wind – are problematic due to their variable nature. For most regions of the world, the sun cannot be expected to shine nor the wind blow when required. What is needed is a way to capture that energy when available, perhaps in the middle of the night, when demand is low, and then store it until it can be used when demand rises. But this is not a trivial problem to solve. _progress | M replaces _kt75 | mirror. visit: http://progress-m.blogspot.com . ready: 01.07.2015. close ✕ According to the European Wind Energy Association , at the end of 2013, the UK had 10.5GW of wind turbine capacity installed, with more in planning and construction. As the percentage of energy generated from renewables increases, the intermittency problem becomes more acute, as has been seen in count...