Efficiency of installation of solar panels on the “East-West” for a solar power plant with a flat roof

the engineering department of the company “Solar Steel Construction” has developed and offers for use the “east-west” fastening system. This system allows you to increase the number of modules located on a flat roof, thereby increasing the power by 20-30%. At the same time, since the panels are not oriented to the south, the energy output per installed watt of power drops by 5-10%. Below is a comparative table from which it can be seen that the total annual generation of FES with the “east-west” system is higher than that of the “south” mounting system.

COMPARATIVE TABLE OF THE EFFICIENCY OF USING THE “SOUTH” AND “EAST-WEST” FASTENING SYSTEMS FOR FES WITH A FLAT ROOF

MOUNTING SYSTEM “SOUTH”
The area of ​​the roof allocated for FES, S:183.54m2
The area of ​​the roof occupied by the FEM, SFEM:90.44m2
Percentage of FEM roof filling,%FEM:49,28 %
The number of FEMs placed on the roof, nFEM:52 piece
Installed power of FEMs placed on the roof, nFEM:20,02 kW
Total annual generation of FES, PFES:24550 kW·h/year
The total cost of metal structures, SΣ:33 088,79 UAH with VAT
The cost of metal structures per 1 FEM, S1FEM:636,32 UAH with VAT/pc.
The cost of metal structures per 1 kW installedpower, S1 kW:1652,787 UAH with VAT/kW
The cost of metal structures for the total annual generation of the FES, SPFES:1,348 UAH with VAT/(kW·h/year)
EXTERNAL APPEARANCE OF THE “SOUTH” MOUNTING SYSTEM
“EAST-WEST” FASTENING SYSTEM
The area of ​​the roof allocated for FES, S: 190 m2
The area of ​​the roof occupied by the FEM, SFEM: 173.68 m2
Percentage of FEM roof filling,%FEM: 91,41 %
The number of FEMs placed on the roof, nFEM: 84 pcs.
Installed power of FEMs placed on the roof, nFEM: 32.34 kW
Total annual generation of FES, PFES: 34380 kWh/year
The total cost of metal structures, SΣ: UAH 58,025.52 including VAT
The cost of metal structures per 1 FEM, S1FEM:690,78 UAH with VAT/pc.
The cost of metal structures per 1 kW installedpower, S1 kW:1794,234 UAH with VAT/kW
The cost of metal structures for the total annual generation of the FES, SPFES: UAH 1,688 with VAT/(kWh/year)
EXTERNAL APPEARANCE OF THE “EAST-WEST” FASTENING SYSTEM

It can be clearly seen that since the east-west systems are not oriented to the south, they do not produce as much power at peak times. As a result, energy production is more evenly distributed throughout the day. The energy production curve in the east-west system is much smoother than that of the panels installed in the south direction. Such a solution is characterized by greater advantages in the morning and evening hours, and slightly less in the midday area.

FIGURE 1 – GRAPHIC IMAGE OF ANNUAL GENERATION IN USE CONSTRUCTION “SOUTH” WITH DISTRIBUTION DURING THE DAYFIGURE 2 – GRAPHIC IMAGE OF ANNUAL GENERATION IN USE CONSTRUCTION «EAST WEST» WITH DISTRIBUTION THROUGHOUT THE DAY

FIGURE 3 – COMPARATIVE GRAPHIC IMAGE OF ANNUAL GENERATION WITH DISTRIBUTION DURING THE DAY USING “SOUTH” AND “EAST-WEST” CONSTRUCTIONS

Conclusion: when choosing the placement of solar panels, we suggest paying attention to the “east-west” system developed by the engineering department of the company “Solar Steelconstruction “, since this placement is more efficient from the point of view of using the area. At the same time, the total annual generation of FES with the “east-west” system is higher than that of the “south” mounting system.


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