Several schemes can be chosen while installing the photovoltaic panel on the roof according to the condition of the roof and the specifications of the photovoltaic panel. The following takes the common situations as examples for making the capacity calculation, and analyzes the influencing factors one by one.
Firstly, it is installed in a flat open place-without considering shelter caused by any factor:.
Conventional 300W Photovoltaic Panels: The area of every piece of photovoltaic panel is about 2 square meters. It can install 500 pieces of photovoltaic panels with a total installed capacity of 150 kW.
High-Efficiency 550W Photovoltaic Panels: Each photovoltaic panel has an area of about 2.6 square meters. About 385 pieces of photovoltaic panels can be installed, with a total installed capacity of 211.75 kW.
The main factor that influences the shielding and installation Angle is the natural shielding and the height of parapet. Flat roof: in actual situation, the installed capacity of 1000 square meters is between 50 kW and 66.7 kW. Masonry structure roof: about 100 kilowatts of photovoltaic system can be installed on the roof of about 1000 square meters in actual situation.
Steel structure color steel tile roof: If the roof faces south to install photovoltaic modules, 1000 square meters of the roof can also be installed about 100 kilowatts of photovoltaic system.
Third, enterprise PV consumption analysis
1. Collect necessary information
Business information: including the number of days the business has been shut down and the latest 12 months of electricity bill statement.
Electricity consumption curve: Try to collect as much detailed electricity consumption curve as possible for the accurate calculation.
2.Calculation of Self-generated Electricity and Total Power Generation by Photovoltaic System Self-generated Electricity Consumption
Measured by User Side Meter Record the electricity used by photovoltaic power generation in the local.
Total power generation of the photovoltaic system: recorded by the photovoltaic inverter or monitoring system, reflects the power generation of the photovoltaic system in a certain period of time, usually a year.
3.Calculation of consumption ratio Absorption ratio formula
Absorption ratio=(self-generated electricity + electricity transmitted to the grid and consumed locally)/total power generation of the photovoltaic system
Data acquisition: usually, the electricity transmitted to the power grid and the electricity consumed locally are hard to acquire precisely. It usually needs the data provided by the power grid company or the estimation by performing the load change analysis of the local power grid.
Fourth, the weighted average electricity price of enterprises
1. Collect data and perform calculation
Calculate the electricity quantity each period consumes and the ratio based on the enterprise’s detailed record of electricity consumption or forecast data, and then calculate its proportion to the total electricity.
2. Weighted Average Electricity Price Formula:
Weighted average electricity price = (C1 x P1) + (C2 x P2) + (C3 x P3)
Among them:C1-the first period’s electricity price; P1-the proportion of electricity consumption in the period.
3.The calculation of a case Suppose an enterprise’s TOU price is stipulated as follows:
In the peak hours (9:00-15:00), the electricity price is 0.66 yuan/KWH. In the normal period from 7:00-9:00 and 15:00-17:00, the electricity price is 0.45 yuan/KWH. In the low period from 23:00-7:00, the electricity price is 0.25 yuan/KWH.
Suppose the share of electricity consumption is as follows: peak hours: 30%, normal segment: 50%, and low point: 20%.
Calculation formula: weighted average electricity price = (0.66 x 30%) + (0.45 x 50%) + (0.25 x 20%) = 0.473 yuan/KWH
Results: The weighted average electricity price of the enterprise was 0.473 yuan/KWH.
fifth. Economic analysis of energy storage system
The economy of energy storage systems is the main factor that enterprises take into consideration while choosing. The key points are as follows:
Cost recovery cycle: Calculated by the combination of initial investment, operation and maintenance cost and price difference, generally speaking, enterprises can reduce electricity cost through mode of low price charging and peak price discharge.
Policy support and subsidy
The purchase subsidy or preferential price policy is available in certain regions, which means business company should learn the policy comprehensively in order to make huge profits in specific areas.
sixth. Maintenance and Reliability of Energy Storage System
It is necessary to consider regular maintenance and monitoring of Energy Storage Systems for long time running, including:
Service life of the battery and replacement: the service life of some ordinary energy storage battery about 8 to 15years and periodic examination of its capability;.
System monitoring and alarm: the real-time monitoring platform shall make timely detection of the operating status of the energy storage system and treat abnormalities in time.
The above analysis is carried out to roughly estimate the installed photovoltaic capacity of 1000 square meters of the roof, and analyze the ratio of the photovoltaic consumption and weighted electricity price in combination with enterprise electricity consumption. Furthermore, decision-making shall be performed by taking into consideration the economic and reliability evaluation of the energy storage system. These data provide scientific support for enterprises when purchasing photovoltaic and energy storage systems.