The house’s solar cells
The Lindells have solutions that will make things easier for them on their journey towards one tonne of carbon dioxide emissions per person per year. One of the challenges the family are facing is to reduce their electricity consumption. In order to further cut their energy usage, the One Tonne Live house will produce its own energy. Firstly via solar heating and secondly via solar cells that generate electricity. The electricity is produced by the house’s own solar cells which are fitted on the south-facing roof and façade. This electricity is used by the Lindells for cooking, recharging the family’s electric car and for powering other equipment at home. The solar heat that the house stores will produce most energy while the house is empty, for instance during the day while everyone is at work and school or while they are away during their summer vacation. Since solar heating produces a surplus of electricity, this will be fed into Vattenfall’s grid, with a corresponding amount of electricity fed back into the house when the sun is not shining.
The cells, made by Sulfurcell, are what are known as thin-film solar cells. All told, the One Tonne Life house’s 96 square metres of solar panelling will produce about 5000kWh/year in a normal year. Factors that affect actual output are how sunny the weather is during the year, the angle of the panels facing the sun, and the direction they face. The geographic location of the house itself is also a major factor – a house in the southern Swedish province of Skåne will produce more electricity than one in Norrland in the north of the country.
There are several different types of solar cell technology and thin-film is one of them. The advantages of the thin-film solution are its design and the fact that it creates a uniform, neatly integrated impression, as well as its price. This is an important consideration in order to recoup their cost over the years.
Christian Axelsson, A-hus