First, there is an independent roof or roof property clear
Construction of photovoltaic power generation system users need to have independent access to the roof. Therefore, there are independent roofs in rural areas, villa residents to install up relatively convenient, for multi-storey or high above the roof of the roof, is a common area, not a single household, the whole building owners have the right to use. To build the power station in the above, you need to get the consent of the owner of the building, otherwise, even if installed, the grid company will not give the grid.
Second, the roof is in good condition
Such as before and after no shelter, light, the roof has enough weight and so on.
There are many factors that cause shelter, probably between floors, probably vegetation, and possibly between components. Do not underestimate the harm of the block, the components have long been blocked, affecting the power generation capacity, income payback period is longer.
Roof load problem has been the beginning of the design of photovoltaic power plants must take into account the problem, the roof can withstand the weight of solar power plant equipment is calculated?
For example, a 3KW home roof solar power station, need 150W solar panels 20, the weight of solar panels 240kg, stent, cement brick weight of about 210kg, the stent covers an area of 15 square meters, so calculate Solar power plant equipment on the roof of the pressure of 30kg / square meter. Home roof general load-bearing are more than 30KG, for the above installation of photovoltaic panels is not much problem.