In developing countries the solar lantern is a cheap alternative to a Solar Home System (SHS) providing 4-5 hours of high quality lighting service or 15 hours of listening to the radio. It provides higher quality light than the use of candles or kerosene lamps. They are also used to provide street lighting in rural areas. In this case Light Emitting Diode (LED) solar lanterns are usually used.
The Glow star lantern developed by Practical Action in the Kenyan context and now marketed by Sollatek is a good example of a robust version of a solar lantern, which can withstand harsh African conditions (Practical action). It uses a PV panel to charge up a 12-Volt lead-acid gel cell battery located in the base of the lamp which is designed to withstand many charge/ discharge cycles. Solar Lantern can be:
CFL Based Solar Lantern
LED Based Solar Lantern
Solar Street lighting system is an ideal lighting system for the illumination of streets, squares and cross roads located in areas that are not connected to the power grid. This fully integrated system combines the latest and most innovative technologies available providing years of convenient and trouble free lighting. Fully assembled factory tested kits are available with or without mounting poles.
A solar-powered pump is a pump running on electricity generated by photovoltaic panels or the thermal energy available from collected sunlight as opposed to grid electricity or diesel A run water pumps. The operation of solar powered pumps is more economical mainly due to the lower operation and maintenance costs and has less environmental impact than pumps powered by an internal combustion engine (ICE). Solar pumps are useful where grid electricity is unavailable and alternative sources (in particular wind) do not provide sufficient energy.
Solar hot water systems comprise several innovations and many mature renewable energy technologies that have been well established for many years. SWH has been widely used in Australia, Austria, China, Cyprus, Greece, India, Israel, Japan, Spain and Turkey.
In a "close-coupled" SWH system the storage tank is horizontally mounted immediately above the solar collectors on the roof. No pumping is required as the hot water naturally rises into the tank through thermo siphon flow. In a "pump-circulated" system the storage tank is ground- or floor-mounted and is below the level of the collectors; a circulating pump moves water or heat transfer fluid between the tank and the collectors.
SWH systems are designed to deliver hot water for most of the year. However, in winter there sometimes may not be sufficient solar heat gain to deliver sufficient hot water. In this case a gas or electric booster is used to heat the water.