PREFACE
The only source of energy for many rural communities, besides diesel power and grid
electricity has been kerosene, candles, dry-cell batteries and centrally recharged lead-
acid batteries. Therefore, there is a constant demand for power to light small
amenities.
Solar energy technology has played a significant role in filling up this gap. The
technology is appropriate for use in the rural areas where there is no conventional
electrical power or the supply is erratic. Studies have shown that where energy
requirements are below 500-watt hours per day, solar electricity is often the most
economical source of electric power. In addition, low voltage solar energy is relatively
simple and can be adapted to the needs of individual applications such as electric
calculators, small radios, television, lights or electric pumps.
Solar electric systems can easily be expanded by adding more modules and batteries.
The technology is environmentally friendly because it does not cause global warming
or destroy the ozone layer. Solar devices have long life spans since they have no
movable parts that wear out and maintenance is low since no fuel is used.