Let the photovoltaic engineering photovoltaic grid-connected power generation system and off-grid power generation system difference

Grid connection refers to access to the public power grid, connecting solar power generation, home power grid and public power grid. It is an electricity production system that must rely on the operation of the existing grid. It is mainly composed of solar panels and inverters, which are directly converted to 220V AC through the inverter to power household appliances. Public power grids; When solar energy cannot meet the needs of household appliances, it is automatically replenished by the power grid. And the whole process is intelligently controlled and does not require manual operation.

Since this photovoltaic power generation system does not require the use of batteries, it can significantly reduce costs. In particular, the country's new grid-connected policy has been clarified, domestic photovoltaic power plants can be connected to the grid for free, and excess electricity can be sold to power companies. From the perspective of long-term investment, based on the 25-year life of the 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 grid-connected solar power generation system, which is also a commonly used method.

Off-grid refers to an independent photovoltaic power station, which does not rely on the power grid and operates independently. It is mainly composed of solar panels, energy storage batteries, charge and discharge controllers, inverters and so on. The electrical energy generated by the solar panel flows directly into the battery and is stored. When it is necessary to power the electrical equipment, the direct current in the battery is converted to 220V AC by the inverter, which is a repeated charging and cycling cycle. Release. This power generation system is not limited by geography and has a wide range of applications. It can be installed as long as it is sunny. Therefore, it is very suitable for remote areas without power grids, isolated islands, fishing boats, free stocking bases, etc., and can also be used as frequent power outages. Such systems 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. In terms of economy, it is difficult to achieve large-scale promotion and use, so it is not suitable for use in places where electricity is convenient.