Nowadays, the electricity bill is higher than before, many families have a headache in finding a way to solve this problem. For that reason, the system Solar grid connection was born to save electricity for households/businesses. Why? GREEN IN again said that the system helps reduce electricity bills? Follow the article below to know the answer.
1. What is grid-connected solar power?
A grid-tie solar system is a system that connects solar power and the national grid. These two types of electricity will be combined to provide electricity to households/businesses.
The main purpose of grid connection is to use full capacity of solar power, saving in electricity consumption.
In short, in case solar power cannot provide enough electricity for your home/business, you will use additional grid power. This helps maintain a continuous power supply and saves costs as much as possible.
2. Advantages of solar grid connection
Solar grid connection brings many benefits to households and businesses when used:
Simple installation
Easy maintenance
Affordable cost of use
Convenience: Can be used even without sunlight
Can be sold: if you have too much unused electricity, you can sell it.
Quick break-even, recover initial costs
Reduce electricity costs at peak times
Clean power source, does not pollute the environment.
3. Components in grid-connected solar power system
Basically, the solar grid-tie system consists of 2 parts: the main part of the system and the connecting device.
Main parts:
Solar panels - these are panels that help capture sunlight. This is the main component, installed on the roofs of households/businesses. These panels are installed in locations that can absorb the most sunlight, this ensures that the power generated is as high as possible.
Inverters are also an important component in solar grid connection. Inverters convert DC electricity into AC electricity. From there, solar power can be connected to the grid.
Devices that help connect:
Connection devices, controls, DC-AC devices, lightning protection devices, etc.
Rails are made of aluminum to connect the panels to the roof.
4. Benefits of using solar grid connection
Save electricity: Every month, households/businesses will significantly reduce their electricity bills thanks to connecting to the solar grid. The amount of electricity used remains the same, but the electricity bill will be significantly reduced.
Control your electricity bill: You don't have to worry about the increase in national electricity prices. Because of the contribution of solar energy.
Environmental protection: By using grid connection, you are contributing to protecting the living environment and reducing toxic emissions.
Reduce overload: Every household uses the national grid, which leads to overloads and power outages. If a portion of all households use solar power, this situation will be reduced. You don’t have to worry about overloads every time you use a lot of electricity.
Temperature regulation: Installing solar panels also helps reduce the temperature in the house. Helps your family not have to face the harsh hot weather.
Low initial cost: The investment cost of grid-connected solar power will be cheaper than other types of systems. Because this system does not need an electricity storage unit, it saves a significant amount.
Long-term use: On average, a grid-connected system can be used for up to 30 years.
5. Connection diagram of the solar grid-connected system
6. Principle of grid connection operation
6.1. Case 1
In the first case, if the electricity generated from the solar panels is greater than the electricity consumed by all the devices. Then the amount of electricity used for the entire system will be electricity from solar energy.
If there is any surplus electricity, it will be transferred to the grid (EVN). Simply put, the surplus electricity will be sold by installing a two-way meter.
However, there is currently no policy for selling excess electricity to the grid. Therefore, you must install additional anti-backflow devices. Therefore, you should consider the installation of the system to provide enough electricity for your family, and not have excess electricity.
6.2. Case 2
In the second case, if the electricity generated from the solar system is less than the amount of electricity consumed. Then your family will still take the entire amount of electricity from the solar system plus the amount of electricity from the grid.
For example: Your house uses 18kWh of electricity, but the solar system only generates 12kWh of electricity. Then your house will use that 12kWh and 6kWh of electricity from the EVN grid.
Please note that this grid compensation feature is 100% automatic. You can rest assured that it will not affect any devices in your home.
6.3. Case 3
Case three is also a disadvantage of grid-connected solar power. When the grid is disconnected, the solar power system will also automatically disconnect. This feature helps protect the devices in the house (in operation) and also ensures the grid.
6.4. Case 4
In case of night - the solar system cannot absorb light, you must use 100% EVN grid electricity.
7. Which model is suitable for grid-connected solar power system?
The grid-connected system is suitable for almost all models (family, business, factory, etc.). In particular, the system is for models that want to save monthly electricity bills.
Models that are wondering whether to invest in solar grid connection or not, please answer the following questions:
What is the average monthly electricity bill? Is it over 1 million?
Is the electricity consumption during the day high?
How many electrical appliances do you have? Will you be purchasing more electrical appliances in the future?
Is the roof large? Is the roof suitable for solar panels?
Do you want to save money on electricity?
When you can answer the above questions, you will know whether you should install a grid-connected system or not. And you also need to learn more about how to install and reputable installation units to ensure the safety of your family.
8. Solving misconceptions about solar grid connection
Solar panels only work in summer, not in winter
Answer: In the summer, the amount of solar radiation is large, so the battery can absorb a lot of light. Therefore, in this season, the system will generate a lot of electricity. But that does not mean that they cannot work in the winter. As long as there is solar radiation, the solar battery can work.
So in winter the system can still generate electricity, just less than in summer.
Automatic solar power supply system when grid power is lost
Answer: To ensure the safety of grid repair engineers, when the grid is disconnected, solar power will not be automatically supplied. Therefore, there will be no reverse flow when the power is disconnected.
The system is only suitable for models that use a lot of electricity.
Answer: Many people think that only households or businesses need to use solar power to save electricity. In fact, families that use little electricity can also install a system to use 100% solar power. Besides, you can sell electricity if there is a lot of surplus electricity.
The system should be installed in moderation to be sufficient for use.
Answer: If you are afraid that installing a system that is too large will waste the electricity it generates, don't worry. If the amount of electricity generated is more than your family consumes, you can sell it to pay for other expenses.
The system is only available for a short time.
Answer: The above opinion is completely wrong. A grid-connected solar power system can be used for 30 - 50 years.
9. Conclusion
Above is all our sharing about solar grid connection. Before installing a solar power system, please consider the above factors carefully. Follow now GREEN IN to update the latest information.