Multijunction solar cells have long been used in space. Solar cells are well proven in space as a fairly reliable and stable source of energy, capable of running very long time. The primary danger for solar cells in space is cosmic radiation and meteoric dust, causing erosion of the surface of silicon cells and limiting battery life. Multijunction solar cells have multiple layers and have efficiencies higher than single junction cells. They consist of a 3-5 semi conductor for each layer.Source: http://www.storehomesolar.com/multijunction-solar-cells/
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Anybody that owns an out of doors swimming pool will definitely wish to keep care of it. The good way to prevent something from getting into the water can be to use a pool cover. Solar pool covers can help keep your pool clean, also help reduce the size of a solar pool heating system, which can save you money. Advantages of using Solar pool covers Solar pool covers are designed to absorb the sunlight. One of the main advantages of coatings is that they prevent heat loss. Evaporation is minimized. Thus, pool covers not only help maintain a comfortable water temperature, but also reduce the cost of heating water in the basin.
Swimming pool solar panels can assist you heat your pool without cost by harvesting the sun rays. Owners of swimming pools are especially advantageous to use solar energy if the system is connected with the solar heating system in the home. Experiments have shown that in this case, you can raise the water temperature at 22 � C above ambient temperature. Any solar pool heating system consists of three main components: solar collector, the filter pump and flow control valve. 
Evacuated tube solar collectors are very efficient. The efficiency of the evacuated tube solar collector depends mainly on the angle. The main part of the evacuated tube solar collectors is a special vacuum tube, in which is being situated water. The entire design is made on the principle of thermos devices. The vacuum eliminates convection losses and thermal conductivity, reducing the overall collector heat loss to a minimum. 