The cost of rooftop photovoltaic mainly includes equipment costs, design and construction costs, as follows:
1. Solar panel costs
The core component of photovoltaic power generation is solar panels. The lifespan and power generation efficiency of solar panels directly affect the revenue of photovoltaic power stations, and the cost accounts for more than 50% of the total price of the power station.
Therefore, purchasing solar panels is a top priority in the installation and construction of power stations, and it is advisable to choose branded solar panels.
2. Inverter costs
Inverters can be divided into grid connected inverters and off grid inverters according to their purpose. Nowadays, most photovoltaic power generation methods are grid connected, and the direct current generated by photovoltaic power is converted into alternating current through an inverter. Inverters are key equipment for power conversion, greatly affecting the stability of the entire photovoltaic system.
3. Photovoltaic bracket cost
Photovoltaic brackets are special brackets for placing, installing, and fixing solar panels, consisting of columns, main beams, sandalwood strips, foundations, and other components. The materials generally include C-shaped steel, galvanized steel, stainless steel, and aluminum alloy.
Generally speaking, the PV support needs to meet the self weight (dead load), wind load, snow load, temperature load and seismic load of the support and solar panel. It will not rust for 10 years, will not reduce its rigidity for 20 years, and will still have certain quality requirements for structural stability for 25 years.
4. Cost of combiner box
In order to reduce the connection between solar panels and inverters, a certain specification and quantity of solar panels are connected in series, and several series connected in parallel to the series photovoltaic busbar lightning protection box, and then connected to the inverter.
5. Photovoltaic DC/AC cable costs
DC cables need to use specialized cables that have undergone photovoltaic certification, as they are usually laid outdoors and require protection from sun, cold, moisture, and ultraviolet radiation.
6. Cost of fixtures/cement-based columns
Fixtures are generally used on colored steel tile roofs, while cement-based columns are mostly used on concrete roofs. Compared to fixtures, the cost of cement pier foundation columns is higher.
7. Survey and design expenses
Photovoltaic design includes grid connection design and power station design. Project design not only affects construction costs, but also greatly affects power generation efficiency.
For example, if the array spacing design is reasonable, will there be any obstruction; Grid connection method; Electrical primary and secondary connection design; How to route cables; The arrangement of solar panels, and so on.
8. Construction costs
Including transportation, lifting, labor, consumables consumption, grid connection, etc.
