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758 PHOTOVOLTAIC SYSTEMS<br />

operates reliably. In addition to the original emergency call function, contact can be made<br />

to various emergency services and information can be obtained. Furthermore, information<br />

such as traffic flows and meteorological data can be recorded at the system location and<br />

communicated to predetermined central stations.<br />

17.2.1.3 Solar lantern for rural households in developing countries<br />

A photovoltaic application that is particularly interesting with regard to its ecological<br />

and social aspects is the replacement of fossil-fuelled light sources – usually petroleum<br />

lamps – in remote regions of developing countries with photovoltaically powered lights.<br />

The robust lighting unit illustrated in Figure 17.5 consists of the light, an electronic<br />

ballast, the rechargeable battery and a charge controller. During the day, it is connected<br />

Figure 17.5<br />

Ottobrunn)<br />

Photovoltaically powered light in a hut in Tunisia (Source: Ludwig-Bölkow-Stiftung,

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