Solar energy is far from being reliable compared to other energy sources like nuclear, fossil fuels, natural gas, etc. Since solar energy depends on sunlight, it can only produce energy in the daytime. Solar panels can't produce energy at night so some systems can store energy ultimately making the system more. One of the factors that make solar energy more interesting is the environmentally friendly benefits it brought with it. The real question is beyond theory when watching from a practical standpoint how environmentally friendly. In comparison with other energy sources, solar energy utilizes a very large area for set up. Usually, rooftops are considered for solar panels the structure or shape of the house can be an issue. The huge installation cost of solar energy systems has been a major discussion for a long time now. Energy storage cost is making the already expensive solar energy systems more expensive. The solar battery is a new. The efficiency of a solar panel is usually measured by how much solar energy a panel converts to usable power. To get an idea of how efficient solar panels are, let's take a look at some of the top solar panels and their efficiency below:.