The cost of solar PV and return cycle For household

Whether household PV be useful or not, depend on three points: PV power plant investment cost, profit margins, return period, the profit also involves subsidies for PV energy board policy, The basic photovoltaic subsidies in 2014 nationwide view are about 0.42-1.2 yuan / kWh, according to Bureau of Energy-related messages in subsidies, it should be increase in 2015, the domestic PV market will enter a new peak.
  The users in the domestic household PV power generation are concentrated in residential villa community, one has a more ample roof area for the installation of photovoltaic power plants, second is that the economic conditions is relatively good, although these conditions are met, but the user will always count one by one, how much to invest for the initial installation of a household PV plant?  How many years to return? It is cost-effective? Firstly, whether in household or commercial PV power plant cost, it both calculated in units per watt, which means the greater power will relatively reduced the single-watt cost, second is to see the PV module brand selected by installers, and different brand have a certain discrepancy, here is the introduction for the cost of household PV generation, the roof villa are usually about 20-50 square, it can be installed 2-5 kilowatts of PV power plants, according to the conventional market price ranging from 8-10 yuan 1W substantially, So that users can easily calculate the area of a roof according to their initial installation cost of solar power system plants; and the next is the cost recovery period, this is also related with the size of power station, according the estimate of family 3-5 PV power plants, the cost recovery are about five years.