Inverter manufacturer Kaco new energy has developed a bidirectional inverter with a capacity of 120kW to charge and discharge a 150kWh lithium-ion battery.
In development since August 2012, the inverter and battery will be installed at a development in Weinsberg, Germany, and supplied with electricity by PV systems with a total installed capacity of 150.12kW.
The development will be made up of 23 units comprising six single-family houses, one house with an attached flat, ten townhouses and one apartment house with five units which are being built on an area of 16,000m². Completion is scheduled for the end of 2013.
The development is being delivered by Kruck + Partner Wohnbau und Projektentwicklung GmbH und Co. KG from Heilbronn. The modules for the PV system come from Yingli Green Energy with 270 W smart modules from the Yingli Solar PANDA series, equipped with optimiser technology from Tigo Energy.
According to Kako, the town itself, with a population of 11,623, will have its entire electricity and heat supply almost exclusively from solar energy.
The company states that a central buffer tank of approximately 20,000 litres is planned for thermal storage of the solar energy. This will be connected to a local heating network, together with a combined heat and power plant and a heat pump. In addition, each building will have its own daily storage. In order to source the maximum electricity and heat supply from solar energy and to optimally align these with each other, KACO new energy will be taking control of all thermal components in addition to the electrical energy management. This will include monitoring that records all energy flows in the development. This data will be used to optimise the existing system.
“By implementing the complete energy management concept for a local storage, Kaco new energy are proving that we are not standing still as a component manufacturer, but can also put in place highly integrated, complex systems for our customers,” CEO Ralf Hofmann said of the significance of the project for the company.
KACO new energy will be working with network operators to define requirements for the future structure of the grid and to develop control parameters, in order to investigate how local-area residential storage can relieve and support the mains electricity grid.
The flagship project in Weinsberg provides the blueprint for a stand-alone solar energy supply, which could be used by other large consumers, such as hotels and industrial operations, said the company.