We make it possible to generate electricity locally and in island operation, which is needed to cover your consumption. The main theme in the use of wind and solar energy is an economic storage beyond the time of sunshine and for wind storms.
There is on one side the battery storage. This allows us, in the case of photovoltaics on light-filled days, to provide a good and sufficient supply of planned consumers if their capacity values are well adjusted. Long-term storage is required beyond this time. This happens with us over the use of the excess energy, by conversion into hydrogen, by means of electrolysis. The whole thing happens under high pressure, since one cubic meter of hydrogen at atmospheric pressure, only provides an amount of energy of about 3 kWh.
This hydrogen can then be used in two directions.
1.) reconversion via a fuel cell to power the island.
2.) Direct use of hydrogen for refueling cars, forklift ect.
Our project has succeeded only through active or advisory activities of cooperation partners. These include the planners of the Ergo Sun, engineering company for ecological house energy technology, the Anleg GmbH in the gas control line, victron energy, Elekto Behnke, B & L Instuments GmbH, Dieter Pohl software and advisory advice by the University of Applied Sciences Strahlsund and QUEL power supply systems. The development was freely funded, with no funding or government grants.
The typical application of our application
are PV systems.
Only pure island operation is favored, i. E. no connection or feed
DC charge controllers bring without conversion, with high efficiency, the PV power from the roof into the island circuit.
This limits the amount of energy available, but not the usual comfort.
For the daily consumption with sufficient light duration, the batteries are sufficient, in our case lithium iron phosphate batteries appropriately sized.
Since most consumers are AC devices, we have three DC / AC converters, one of which builds the appropriate phase.
An intelligent control is necessary in order not to overload the phases.
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The now completed plant is designed for an annual consumption of about 6.5 TkWh / a and designed as a real island, i. no connection to the fixed network and also no feed-in to the grid.
The energy basis is a 15 kWp PV system, coupled with the island in a 48 V DC system.
Daily storage are lithium iron phosphate batteries. The consumer alternating current is ensured via DC / AC converter.
This "summer island" alone has enabled the entire power supply for the system from March 2017 to October 2017 in practice. However, it is necessary to organize a simple consumption management. The idea of the "island" must also be internalized mentally, i. we only have the amount of energy available, which provides us with the capacity of the entire plant. You can not get 10 kWh from a 5 kWh storage.
The landline from which you can use thoughtlessly is not available. However, this does not mean any comfort restriction, but requires an intelligent organization!
Our plant is designed on the technical basis of 5 kWh electrical power, both in the field of electrolyzer, as well as the fuel cell and now in function. The electrolyzer is a new development based on anionic membrane electrolysis. The hydrogen has an outlet pressure of 20 bar and is compressed by an electric compressor to 300 bar and stored in bundles. The storage capacity thus achieved is just under 500 kWh per bundle of cylinders. (12 pcs. A 50l)
At various measuring points we take input and output values to determine the true efficiencies.
As fuel cell, an air-cooled version was chosen to first secure the entire electrical route and at the same time to keep the reaction space warm in winter.
With our island, we have solved the problem of power over-shot (battery full, consumer operated) in the light-rich time.
The basis is a newly developed, based on the anionic membrane electrolysis, electrolyzer - power 5 kWh.
The power oversupply is converted over this with the inclusion of water, into oxygen and hydrogen.
The hydrogen comes out of the electrolyzer at a pressure of 20 bar, is compressed to 300 bar and stored in standard hydrogen cylinder bundles.
(Oxygen / O2 is blown off).
The compressor we use comes to 450 bar. (Forklift only need 150 bar refueling pressure)
For each bundle of cylinders, we have a storage capacity of around 500 kWh, which means a cost of up to € 8.00 / kWh net !!!! (Battery storage approx. 600,00 € / kWh)
In order to complete the island all year round, however, we will send the hydrogen back to the island in the dark, starting in November.
The cylinder bundles are connected with each other.
About a Umfülleinheit now the hydrogen directly to the refueling of cars ect. be used.
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The overall system: CO2-free power generation as a self-sufficient power generator. Flexible as an energy container, assembled from 5 kWh - 20 kWh
The "summer island" for network freedom! from March to October
High self-supply in the electricity sector, as well as fuel supply in the hydrogen sector after elimination of the promotion of PV systems.
The hydrogen package: PV - electrolyzer - storage
- filling station for logistics centers (forklifts) or car dealerships (initial refueling, maintenance of H2 cars)
Heating systems, free of fossil fuels and CO2 emissions.
Heat pump systems, e.g. the ice storage heater and the year-round power supply via our system.
Experience shows that even the summer supply of the electric car in city mode, via the normal power connection works well.
In order to make the island supply truly self-sufficient, the hydrogen is "back-converted" via the fuel cell.
Depending on the state of charge of the island, the BZ is switched on or off as an aggregate.
The fuel cell operates in the atmospheric region, so that appropriate pressure reducer are interposed.
We use an air-cooled 5 kWh BZ.
The waste heat heats the technical room to keep the water-bearing parts of the electrolyser frost-free. At the same time, the accumulated waste product, namely water is recovered, and then again stand by as a raw material for the electrolysis.
The electrolysis process used by us unfolds its real advantages over PEM electrolysis, namely the use of simply distilled water.
In order to achieve an even higher efficiency of the BZ, one can also use water-cooled systems, but which require a considerable technical overhead.
The systems BZ and electrolyzer, which were built by us in two control cabinets, can also be easily mounted in a cabinet.
With an average power consumption of about 15 kWh per day, the BZ runs between 3 and 5 hours in the dark.
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Our offer covers all 5 areas of application or even parts of it.
For the small summer island, calculated on a mean annual consumption of approx. 3.5 T kWh (home size), we have just completed the basic project
It is essential to create a energy consumption profile before planning a plant!
If we have aroused your interest, please contact us:
Vietmannsdorfer Straße 38
17268 Templin - Germany
Tel.(1) +49 3987 - 61 51
Fax(1) +49 3987 - 53 553
Mobil 0171 4 400 656
GF: Herr Uwe Drescher
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