How to determine the home solar power system installed capacity size?

Penetration in terms of knowledge, technical or strong solar power, which is currently one of the difficulties to promote solar power, ordinary people if you want to install a home solar power really is no way to start, today we have the knowledge to be universal, to give you a minute guide to selection and design of solar power; I am an old technical engineer, currently serving in Shanghai to ex Solar Energy Application Technology Co., Ltd., specializing in Shanghai, Jiaxing and the surrounding areas in household solar power technology work, installed a lot of Residents rooftop solar power, but also talked to many ordinary people users, many types of problems, most of the first few issues to point the installed capacity of identify problems, so in the Shanghai area and the surrounding me to make a few technical insights not overconfident (peer more bear, it is possible to disclose trade secrets). First, the user in the selection, should be combined with (1) the degree of their own electricity per month, and (2) a comprehensive selection roof area can be used, just know that these two can be, (1) the degree of its own electricity per month, most Good is to collect a list of tariff payment for 12 months a year, the payment list of statistics about the reason for this law is straightforward to see your house electricity certainly month high, some low, some months, we take an average, PV engineers in the design of the program have a principle called: the principle of economy, this economic talking about is the capacity to be designed to be close to the average user consumption, neither too big and not small, oversized design Users investment is too large, elongated age benefits, design capacity is too small, the user changes electricity, do not see results. (2) The roof area: Many users are villas, single-family courtyard, some supermarkets, factories and other places booth, few users own climb onto the roof to measure the size, a good climb to the roof, and secondly even climb up, I do not know what size measurement. Here, I tell you a simple way, because the best south-facing solar panels installed, followed by the east and west, users simply install the area of ??housing can get the (real estate license there, I do not know to look at real estate license), about half of the area is to install solar panels area, basically wrong, this is my years of experience in a large database of summary statistics (unless the house special structure), the program for the peaceful roof garden roof universal. Talking about this, I believe we have a little understanding, and finally I summarized from a technical perspective, if the user wants to install solar power, can not determine the size of the installed capacity, look at the following two: (1) First user to estimate the roof area (preferably with drawings , length and width dimensions detail). (2) to collect payment for one year or in recent months with a list of electricity consumption, electricity consumption per month to assess their own situation. Combining these two points, the design of economic and safe solar power generation equipment. When selecting unable to grasp, you can also contact me: QQ: 2753200468 or call technical service Tel: 13456200881 ensure scientific and rational selection.