And with the introduction of different photovoltaic integrated products, and incorporating them into the construction of your home, or your work place, you can actually save a lot just from the initial cost of construction as compared to building a conventional custom house. Solar Pool Heater If your home, or work place, has a pool, then a solar pool heater is needed to keep that pool heated at a certain temperature. If you think that setting up and maintaining the system will be difficult, it might be better to wait until the technology is more rampant in your area. About Budget Solar cell systems are generally costly in the beginning. Later on, you will realize that the costs will start to go down, since the energy stemming from the sun is free and available all the time. You can expect to continue getting power and energy from the sun for several decades without having to recharge batteries or keep purchasing new parts. Even though the energy may not always be readily available during cloudy days or at night, the availability is still there everyday. The solar energy supply will be available as long as the sun is existing. Grid-Tie Solar System The grid-tie solar system is very useful for homes that are already linked to the utility grid. The primary advantage of this kind of system is the cheap price of utility. The system needs to be wired with an inverter that creates pure-sine-wave AC electricity, which is needed for linking to the utility grid. These were more cost-effective and less fragile, with about 20% efficiency. More Technologies There are several technologies now, including a minimum of 14 photovoltaic cell types, like polycrystalline silicon, thin film, monocrystalline silicon and amorphous cells. Concentrating solar power also appeared in several types. The First Category The first way to view solar energy will depend on how the energy is transformed into useful energy. There are a couple of types in this category - passive solar energy and active solar energy. Passive solar energy describes the harnessing of the energy of the sun without the need for mechanical devices.