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What is the difference between off-grid and connected photovoltaic systems

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Release date: 04-June-2020

       Simple, off-grid PV power plant is the solar power stored in the battery, and then converted into a 220V household voltage by an inverter. Power stations and networks can probably understand from the name, which refers to the city and are electrically connected together, and grid PV power station is no electrical energy storage device directly through an inverter to convert the voltage requirements of the national grid needs and priorities for household use.

      The electricity that the households can’t use can be sold to the country. Current national policy support, is vigorously support the solar photovoltaic power generation, household photovoltaic power stations as long as power generation, there will be state subsidies. However, if you want to connect to the grid, you must first apply to the local state power grid department .

What is the difference between off-grid and connected photovoltaic systems


       First, the grid PV station

      Grid connection is to connect to the public power grid, that is, to connect solar power generation, home power grid, and public power grid. This is a power generation system that depends on the existing power grid to operate.It is mainly composed of a solar panel and an inverter. The solar panel emits 220V alternating current directly through the inverter and supplies power to the household appliances. 

      When the solar power generation exceeds the electricity used by the household appliances, the excess electricity is sent to the public. Power grid; and when the solar power generation can not meet the use of household appliances, it will automatically supplement from the grid.This entire process is intelligently controlled and does not require manual operation.

What is the difference between off-grid and connected photovoltaic systems 

      Since this photovoltaic power generation system does not require the use of storage batteries, it saves a lot of costs. In particular, the new grid connection policy that the country has issued has made it clear that householdphotovoltaic power plants can be connected to the grid for free, and excess electricity can also be sold to power companies. From the long-term perspective of investment, based on the 25-year service life of the home photovoltaic power plant , the cost can be recovered in about 6-10 years, and the remaining ten years are earned. 

      Therefore, if you want to save electricity costs and the power supply is convenient, choose a grid-connected solar power system, which is also the current mainstream method. There is a more detailed introduction on costs and benefits in home photovoltaic power generation.

      However, the grid connection also has its shortcomings, that is, when the public grid is powered off, photovoltaic power generation cannot operate. But if the grid-connected inverter is replaced by an intelligent micro-grid inverter (hybrid grid-connected and off-grid inverter), the power station can operate normally.

      So, how can we store the electricity generated during the day and use it at night? This requires the addition of controllers and batteries. During the day, the controller stores the power generated by the photovoltaic in the battery, and at night the controller releases the power stored in the battery for lighting.

What is the difference between off-grid and connected photovoltaic systems 

       Second, off-grid PV power station

      This is also called an independent photovoltaic power generation stations, is not dependent on the operation of the grid independent power generation system, there are solar panels, storage batteries, charge and discharge controller , an inverter and other components. The electricity generated by the solar panel directly flows into the storage battery and is stored. When it is necessary to supply power to the appliance, the DC current in the storage battery is converted into 220V alternating current through the inverter, which is a repeated cycle of charge and discharge process. 

      This kind of power generation system is widely used because it is not restricted by the region. It can be installed and used as long as it is exposed to sunlight. Therefore, it is very suitable for remote areas without grids, isolated islands, fishing boats, outdoor breeding bases, etc., and can also be used as a frequent power outage. Emergency power generation equipment in the area.

What is the difference between off-grid and connected photovoltaic systems 

       This kind of system needs to be equipped with a battery, and it occupies 30-50% of the cost of the power generation system. And the service life of the battery is generally 3-5 years, and it has to be replaced later, which increases the cost of use. In terms of economy, it is difficult to promote it on a large scale, so it is not suitable for use in places where electricity is convenient.

       However, it is also very practical for families in areas without power grids or areas with frequent power outages. Especially in order to solve the lighting problem during power outage only, DC energy-saving lamps can be used, which is very practical. Therefore, off-grid power generation systems are specifically designed for use in areas without grids or in areas with frequent power outages.


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