Photovoltaic slates (Fig. 14.3) and tiles, which have the general appearance of fibre-cement slates and
shiny plain tiles respectively, can be used on suitably orientated roofs as an ecological alternative to standard roofing, subject to appropriate planning consent. The lower half of the individual slates consist of photvoltaic cells which are connected into a standard photovoltaic system. The tiles are 2.1 m strips of material, marked in units to resemble conventional roof tiles and overlapped to give the required visual effect. To obtain 1 kW of power under optimum conditions, 10 m2 of slate or 16 m2 of tiling are required.
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Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.