Since this photovoltaic power generation system does not require the use of a battery, it also saves a lot of cost. In particular, the country's new grid-connected policy has clearly stated that household PV power plants can be connected to the grid free of charge, and excess electricity can be sold to power companies. From the long-term perspective of investment, according to the 25-year life expectancy of household PV power plants, the cost can be recovered in about 5 years, and the remaining 20 years are earned. Therefore, if you want to save electricity costs and the power supply is convenient, then choose the grid-connected solar power system, which is the current mainstream way.
The off-grid photovoltaic power station stores solar power generation into a battery and then converts it into a household 220V/380V voltage through an inverter.
This is also called an independent photovoltaic power station. It is a power generation system that operates independently without relying on the power grid. It mainly consists of solar panels, energy storage batteries, charge and discharge controllers, inverters and other components. The electricity generated by the solar panel directly flows into the battery and is stored. When the appliance needs to be powered, the DC current in the battery is converted into 220V AC by the inverter, which is a repeated cycle of charging and discharging. This kind of power generation system is widely used because it is not restricted by the area. It can be installed and used as long as it is exposed to sunlight. Therefore, it is suitable for remote and non-grid areas, 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.
Such a system has to be equipped with a battery and occupies 30-50% of the cost of the power generation system. Moreover, the service life of the battery is generally 3-5 years, and it has to be replaced afterwards, which increases the cost of use. In terms of economy, it is difficult to get a wide range of promotion and use, so it is not suitable for use in places where electricity is convenient.
However, it is very practical for families in areas without power grids or in areas with frequent power outages. In particular, in order to solve the lighting problem during power failure, 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 power grids or in areas with frequent power outages.