The solution for the German EEG 2012
With the Dynamic Feed-in Limiter for the PowerRouter, Nedap offers a unique solution to diminish the consequences of the new German EEG 2012 law for the system owner. The Dynamic Feed-in Limiter controls the flow of generated solar energy, so that it is used directly to feed connected loads. Only the surplus of energy is fed to the grid. A sensor measures the actual grid current, which enables the PowerRouter to comply with the German 70% reduction law at the point of feed-in instead of the output of the inverter. Thus, by controlling the output power in an intelligent way, reducing the output power of the inverter and loss of revenues can be avoided. This solution is nominated for the Intersolar AWARD 2012.
Sensor measuring the grid current
Nedap’s PowerRouter is provided with an easy-to-install, clip-on sensor, which will measure the actual grid current. This makes it possible for the PowerRouter to match generated solar energy with the connected load, rather than feeding it to the grid. As the reduction of 70% will be measured at the point of feed-in, instead of the output of the inverter, the Dynamic Feed-in Limiter will subtract consumed energy from the maximum allowed energy (70% of the installed solar generator). By first making an optimal use of the self-generated energy, only the surplus of energy – the energy that cannot be used directly – will be fed to the grid. In the case that the 70% limit is reached, and the surplus cannot be stored in batteries, the Energy Management Relays allows to switch on additional loads instead of switching off or reducing solar generation. This way, the PowerRouter is always compliant with the German EEG 2012 reduction law and no energy is wasted.
Batteries may be connected to the PowerRouter to store the surplus of generated energy, which makes it possible to further maximize the use of own generated energy. At times when generated solar energy is not sufficient to supply the loads, stored energy will be used to feed the loads. Only when the batteries are fully charged and no energy is required, the generated solar energy will be supplied to the grid against the (lower) feed-in tariff.
Since the PowerRouter stores generated solar energy directly, instead of converting it to AC voltage prior to charging, the PowerRouter can skip one conversion step, which increases the overall system efficiency. The patented Power Backbone technology of the PowerRouter allows renewable energy sources, batteries and loads to interchange energy and data within one product. Thus preventing complicated installation of separate charger- and inverter products and external logging devices. Direct input of solar power is converted and routed in relation to supply and demand of energy, resulting in an efficient easy-to-use solution.
Visit http://powerrouter.com/ for further information.