For many years, homeowners who purchased PV modules have been advised to install the modules on a south-facing roof. As a result, the maximum amount of solar energy can be absorbed during the day. This is a “wonderful thing†for the owner himself. However, this is not the case for utility companies and grid companies.
At noon, PV modules installed on the roof will absorb sunlight from the West. Overall, the power generation of the modules will decrease, but the electricity generated during this period is the most valuable.
However, this idea has not been convincing. A recent survey conducted on 110,000 California households showed that the vast majority of PV modules are installed in the south, because most owners pay for electricity generated by the components, and installing components southwards can generate electricity. The amount is maximized, but the peak power generation is usually at noon, not afternoon, and this period of time often has a large demand for electricity.
In the afternoon, people will choose to watch TV, turn on the lights or start the dishwasher. However, the price of electricity during peak periods is relatively high. Barry Fischer and Ben Harack, authors of the above report, stated that "while the advantage of installing components southward may reflect a serious imbalance in energy supply and demand."
The research found that households with photovoltaic power generation systems use less than half of the electricity used by other ordinary households. However, from 4 pm to late at night, they use more electricity, and power peaks appear around 5 pm.
If the assembly is installed westwards, it means that the power generation will account for about 55% of the peak of power generation for an hour starting at 5 o'clock in the afternoon. Therefore, a 10kW power generation system can generate 5.5kW. However, south-facing installations can maximize the amount of power generated, while during peak periods of electricity use, the photovoltaic system only supplies 15% of the electrical energy, that is to say 1.5kW.
Therefore, in summary, installing components southwards in order to obtain maximum power generation is in the interest of the homeowner’s own interests. Installing components in the west is in line with the immediate interests of the grid company.
So, why not install the components toward the west? Some energy analysts pointed out that because some families' roofs are oriented toward the south, while other home photovoltaic system owners are paid according to time slots, and the grid companies provide subsidies in proportion to wholesale electricity prices, many owners do not choose to use peaks and valleys. Photovoltaic time, because they are paying at a uniform price. Therefore, the subsidy benefits of the current payment system allow household owners to "make mistakes."
It is commendable that the California Energy Regulatory Commission recently announced that it will receive up to $500 in incentives for newly installed systems facing the west. According to the authors of the aforementioned report, a photovoltaic system was completed every 3.2 minutes.
In fact, not all PV modules need to be installed in one direction. The homeowner can choose to purchase a tracker that moves like the same sunflower flower following the sun. It is reported that the tracker can increase the power generation of the module by about 45%. However, the tracker costs hundreds or thousands of dollars. The more economical and simpler method is to purchase several more modules.
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