1, determine the installation capacity
Determine the installation location of the photovoltaic power station, the power station can not have buildings, trees block the shadow; the estimated capacity of the power station according to the available area, the installed component capacity per square meter is about 100W. For example, a roof with a usable area of ​​50 m can be used to build a 5 kW power station.
Determine whether to use single-phase or three-phase grid connection according to the form of the grid connected to the home
2, choose the grid mode
Spontaneous use of surplus power online: that is, the electricity generated by photovoltaics is used at home and sold to the grid. This mode is suitable for households with large electricity consumption during the day. The higher the self-use ratio, the shorter the cost recovery cycle.
Revenue = electricity subsidy + sales revenue + electricity savings
Full Internet access: that is, all the electricity generated by photovoltaics is sold to the power grid, and it is not used at all. In this case, the local photovoltaic power generation benchmarks are used to purchase all the power generated by the power station.
Revenue = electricity subsidy + sales revenue
The full-time Internet connection mode is suitable for families with less electricity during the day. The grid connection is simple and enjoys the full feed-in tariff.
3, choose the brand of photovoltaic power plant system
Choose the reliable PV power plant brand, the quality of components, inverters, distribution boxes, cables, brackets, etc., and there is no guarantee after sale.
4, component arrangement
Component orientation: the ideal mounting azimuth is just south
Component inclination: The optimal inclination of the system is similar to the local latitude angle, or according to the roof structure, the components are laid parallel to the slope of the roof, and the inclination can be measured using an angle gauge.
The front and rear row spacing of the components: the spacing should ensure that the solar cell array is not blocked from 9 am to 3 pm on the winter solstice. By using the EXCEL table formula calculation, the latitude, component width, length, and inclination can be selected to calculate the appropriate spacing. Take the Guangzhou area (23° north latitude) as an example:
1) In addition to ensuring the optimum inclination and orientation of the components, the brackets should be placed as far as possible on the roof.
2) The bracket material is made of stainless steel or hot-dip galvanized steel for anti-corrosion purposes.
3) The bracket should ensure that the bottom of the assembly is not less than 15CM above the bottom surface to avoid water and splashing of components onto the surface of the component.
6, inverter installation environment
1) Try to avoid installing in direct sunlight
2) Try to avoid installing in a location that is prone to rain
3) The installation location needs better ventilation and heat dissipation.
7, grounding protection
The importance of grounding: Electrical grounding can prevent equipment short-circuit, component or inverter damage caused by leakage, or even burn, and protect the human body from electric shock when it touches live metal parts.
The electrical grounding system includes: component frame grounding, inverter grounding, and power distribution cabinet grounding.
Component grounding: The aluminum frame of the component is connected to the bracket and then grounded reliably through the down conductor.
Inverter grounding: PE end of AC terminal and PE grounding of chassis enclosure.
Grounding the power distribution cabinet: Use a grounding wire to connect to the grounding bar or ground the nearest frame.
8, lightning protection grounding
The photovoltaic power station is installed at the top of the building and is vulnerable to lightning strikes. The surge current generated by lightning strikes will damage the system equipment such as the inverter. Therefore, the power station needs lightning protection grounding to guide the surge current to the underground to protect the system.
What does IC mean on a circuit board?
The IC on the circuit board is an integrated circuit module, and you can see the small black block with pins on the circuit board is the IC.
The role of the ic on the circuit board
Analog integrated circuits, also known as linear circuits, are used to generate, amplify, and process various analog signals (signals whose amplitude changes with time. For example, audio signals from semiconductor radios, tape signals from VCRs, etc.). The input and output signals are ratio.
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