The following are the 5 most comprehensive professional photovoltaic roof exploration
1. The roof is mainly tile roof, concrete roof and color steel tile structure.
2. Before the on-site survey needs to carry tools:
20 meters or more tape measure, laser rangefinder, spirit level, compass or mobile phone compass APP and paper pen. If you need to incline the roof, it is recommended to wear a safety rope on the non-slip laces.
3, tile roof and color steel roof structure survey points
(1) Inquire into the year of completion of the construction and ownership of the property.
(2) Roof orientation and azimuth. Live compass measurement plus google satellite map query.
(3) Roof tilt angle. The roof inclination angle can be calculated by measuring the width of the roof and the width of the house. The slope of the southern roof is generally larger than that of the northern roof.
(4) tile type, tile size. Common building types for civil buildings include Roman tiles, hollow tiles, double-slot tiles, asphalt tiles, flat tiles, fish scale tiles, Spanish tiles, and slate tiles. If the tile size is not easily measured on-site, you can also check the size of the tiles after determining the tile type. Because the size of the tile, especially the thickness, determines the selection of the bracket system hooks and other parts.
(5) Consider the occlusion of the roof. Accurately measure the size of the obstructions around the roof, and later use the shadow analysis software to model the roof area. Shadow shading on solar panels can greatly affect power generation.
(6) Open part of the tiles to see the roof structure, pay attention to the size and spacing of the main beams and purlins. The tile roof bracket system hook is installed and fixed on the purlin.
(7) Obtain the house structure from the project owner to facilitate the calculation of the roof load.
(8) Ask whether the owner intends to install a photovoltaic system.
4, the concrete roof survey points
(1) The year of completion of the building, ownership of the property; roof orientation and azimuth.
(2) Measure the height of the parapet and perform shading analysis later to determine the area that can be installed and used.
(3) Check the waterproof condition of the roof. To prevent damage to the waterproof structure of the roof, consider the installation of the bracket using the self-(negative) or expansion bolts. The load capacity of the standard civil concrete roof needs to be more than 3.6 KN/m2. When considering the short-term wind load and snow load, the load of the support system is also smaller than that of the concrete roof. In order to avoid any damage to the waterproof structure caused by the installation of the photovoltaic system, priority is given to self-(negative) heavy bracket installations.
(4) Obtain the house structure diagram from the project owner to calculate the roof load.
(5) Ask whether the owner intends to install the PV system on the south side of the roof.
5, electrical survey points
(1) Check if the incoming power is single-phase or three-phase. Civil villas are generally three-phase power. The single-phase output photovoltaic power generation system should be connected to a phase with more power for the three-phase combined input line switch. The conditions permit the use of three-phase inverters or three single-phase inverters.
(2) Ask about the average monthly electricity consumption or the electricity cost and main electricity consumption time period. As a reference for PV system installation capacity.
(3) Check the capacity of the owner's incoming line switch. Considering the issue of income, the output current of the photovoltaic power generation system should not be greater than the capacity of the household switch. Under the current subsidy policy, it is still the maximum self-use income.
(4) Taking the principle of convenient and costly cabling, consider the installation position of the inverter and the cabinet. The installation position of the inverter and the grid-connected cabinet also takes into account the heat dissipation ventilation and the waterproof sunscreen issue.
Followed by the stage of business negotiations, signed a contract. After the signing of the contract, the design of the bracket installation, component arrangement, and electrical access plan was completed. In this design, we were designed by engineers engaged in many years of photovoltaic design abroad, aiming to rapidly introduce advanced and mature design concepts from abroad. In our domestic projects, especially in terms of standardization and flow, we can achieve a seamless connection between China and foreign countries. After the owners saw the plan, they felt very satisfied.
Guanghan Longrun Science and Trade Technology Trade Co., Ltd. , https://www.kairungongju.com