After the work of Russell Ohl during the 1940s, Calvin Fuller, Gerald Pearson and Daryl Chapin made the silicon solar cell in 1954. These were the early solar cells that were very expensive and can reach efficiencies of around 4.5% to 6%. The highest efficiency PV cells produced were by Boeing and SpectroLab in 2009, with efficiencies of around 35% to 41%. Solar Thermal Systems Solar thermal systems, on the other hand, simply generate heat, and are well-suited for boilers, furnaces and water heaters, as this type of system allows you to make heat using direct solar energy at a much lower cost as compared to using conventional energy and electricity. However, if you want to retrofit your home with one of these solar thermal systems, you need to sacrifice a little bit of space in your home. It is growing at a rate of 2% per year, and if the figures continue to grow, solar energy will be the preferred source of energy worldwide. Most modern nations are encouraging people to rely on this renewable resource so that they can save more and help conserve the environment. The trend can continue to provide benefits for decades to come if well-maintained. On the other side, oil is not considered as a renewable source of energy. Oil can take millions of years to form. At present, oil reserves are being depleted at a very fast rate compared to its time of development. People will have to prepare for the consequences of running out of this resource. Helping the Environment Solar energy is non-polluting. You can get a lot of financial benefits by maintaining the material properly. Expect solar panels to last for up to 3 decades if well-maintained. Here are some tips on how to begin your project. Starting Out Begin with the sandpaper and use it to scour the different regions of the copper of one of the available sheets. This is definitely a major cause for alarm for most people. Aside from that, add the fact that the main energy source for solar energy is actually hydrogen, which is a form of gas that is highly explosive, and that is definitely something that you should be aware of. Hydrogen is a tremendously destructive component that can be found in H-bombs, and also produces dangerous fallout for those exposed.