1. Grid connection refers to connecting to the public grid, connecting solar power, home grid and public grid. It is an electricity production system that must run on the existing grid. It is mainly composed of solar panels and inverters. The solar panels are directly converted into 220V AC power through the inverter to supply power for household appliances. Public grid; when solar energy cannot meet the needs of household appliances, it is automatically supplemented by the grid. And this whole process is intelligently controlled, no manual operation is required.
Since this photovoltaic power generation system does not require the use of batteries, costs can be significantly reduced. In particular, the country's new grid-connection policy has been clarified, domestic photovoltaic power stations can be connected to the grid for free, and excess power can be sold to power companies. From the perspective of long-term investment, based on the 25-year life of a home photovoltaic power station, the cost can be recovered in about 6-10 years, and the remaining 10 years can be saved. Therefore, if you want to save electricity bills and provide convenient power supply, you can choose a grid-connected solar power generation system, which is also a commonly used method.
2. Off-grid refers to an independent photovoltaic power station that does not rely on the grid and operates independently of the photovoltaic power generation system. It is mainly composed of solar panels, energy storage batteries, charge and discharge controllers, inverters, etc. The electricity generated by the solar panels flows directly into the battery and is stored. When it is necessary to supply power to the electrical equipment, the DC power in the battery is converted into 220V AC power by the inverter, which is a repeated charging and cycling cycle. freed. This power generation system is not limited by regions and is widely used. It can be installed and used as long as it is sunny. Therefore, it is very suitable for remote areas without power grids, isolated islands, fishing boats, free-range bases, etc., and can also be used as frequent power outages.
This type of system must be equipped with batteries, which account for 30% to 50% of the cost of the power generation system. In addition, the battery life is generally 3-5 years, and it needs to be replaced afterwards, which increases the cost of use. Economically, it is difficult to achieve widespread use, so it is not suitable for use in places where electricity is convenient.
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