Electricity from the roof reduces the load for the grid

The solar roof system helps recharge a power-holding device to use it gradually. When the system capacity is insufficient for use, the device will automatically supplement.

This is a technical solution that has been successfully installed by Dr. Le Hoang Thi To, along with his colleagues, to help reduce the load on the grid at rush hour.

Smart support

The roof is where solar panels are installed to create a one-dimensional current, which can also be installed in places where light is easily received to produce direct current. This direct current will be converted into alternating current through an electrical transformer. Depending on the power consumption, install the battery with the corresponding area.

In light conditions in Vietnam, the average to produce about 4-5 kWh / day, equivalent to 150 kWh / month requires solar cells with an area of ​​about 10m ² .

Install solar batteries in oil rig.Photo: Thai Ngoc

Dr. Le Hoang Thi To, said that alternating current generated from solar energy and this conversion system is of a safe quality other than grid, the system works absolutely safe, does not affect electricity. nets and other electricity consuming devices.

The electricity generated from the solar system is used for household electrical appliances to replace the grid. When the electric power generated from solar energy is greater than the power consumed, this excess power is automatically deposited into the system's electrical holding device.

In case the power consumption is greater than the amount of electricity produced from solar energy such as at night, cloudy sky, rain, or using high-capacity devices . then the device at this time Power supply will automatically provide the opposite, if it is not enough, it will be compensated from the grid. As a result, this system will effectively support the reduction of grid load during peak hours.

Payback after four years

'Previously, my family used over 300 kWh / month, but since installing this system, the amount of electricity used has been reduced to only half, saving nearly 2/3 of the amount to be paid', Mr. Nguyen Duc Tho , residing at Le Van Si Street, Phu Nhuan District, Ho Chi Minh City, one of the first to use grid-connected solar power system, talked about the efficiency of this system.

And Nguyen Van Dong, in Tay Phu commune, Hoai Son district, An Giang province, said that his family has been using electricity from solar power for more than a year and has not had any damage. According to Mr. Dong, because his farm is in the middle of the field, he cannot pull electricity. Previously, he had to use a 150V battery. Every two days, he had to charge the battery once and every time he charged, he lost 10,000 dong. Every year, he has to replace at least three batteries, calculated to also out of more than four million, plus the average charging money, the cost of using electricity is not small.

He found out and installed a solar power system that cost more than 16 million VND, but according to him, 'I can return the money for about 4 years, not to mention I had to use savings before, but now Use electricity comfortably . '.

Similarly, old farmer Le Van Hung, Nha Binh commune, Chon Thanh district, Binh Phuoc province informed that he has 5 hectares of farmland, because he is located far away from the electricity grid, away from residential areas, so he often steals stolen wire. The power cord must be switched to use an explosive device. The cost at that time calculated out every month 500,000 oil coins. Seeing many farmers in the district using solar power system effectively, he went to investigate and installed solar energy system for his use.

The lifespan of the solar system is at least 20 years and the solar panel's efficiency will decrease by 15-20% after 25-30 years of use.

According to solar experts, this is a clean, environmentally friendly source of energy, it is necessary to have a policy to support the use of solar energy to make this energy source available to people, especially in remote areas. , far.