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Installing photovoltaic solar panels on your own roof allows you to have your own solar power station. However, many customers feel confused when choosing to install a home solar power system. Should they choose a grid-connected or off-grid system? Do they need batteries?
A grid-connected solar photovoltaic power station must be connected to the public electricity grid and relies on the existing grid to operate. It mainly consists of photovoltaic solar panels and inverters. The solar panels generate electricity, which is converted into 220V AC by the inverter to power home appliances. When the power generated by the rooftop solar power station exceeds the consumption of home appliances, the excess electricity is fed back into the public grid. Conversely, when the solar power generation cannot meet the demand, it automatically draws from the grid. This entire process is controlled intelligently and does not require manual operation.
The grid-connected solar photovoltaic power station does not require the use of batteries, which greatly saves costs. Particularly, new policies have clarified that home solar power stations will receive subsidies from the government as long as they generate power. They can connect to the grid for free, and excess electricity can be sold to power companies. From a long-term investment perspective, considering the 25-year lifespan of a home solar power station, the cost can be recovered in approximately 6-10 years, with the remaining years being profit.
Therefore, if you want to save on electricity costs and have convenient power supply, choose a grid-connected home solar photovoltaic power system, which is currently the mainstream method.
The off-grid solar photovoltaic power system, also known as a standalone solar power station, operates independently from the grid. It mainly consists of photovoltaic solar panels, energy storage batteries, charge and discharge controllers, and inverters. The electricity generated by the solar panels directly flows into the batteries for storage. When electricity is needed, the direct current from the batteries is converted to 220V AC via an inverter. This charging and discharging process is repeated.
The off-grid solar photovoltaic power system is widely used as it is not limited by geography; it can be installed wherever there is sunlight. Therefore, it is particularly suitable for remote areas without a grid, islands, fishing boats, outdoor farming bases, and can also serve as emergency power equipment in areas that frequently experience power outages. Since the off-grid solar power system must be equipped with batteries, they account for 30-50% of the cost of the generation system.
However, for households in areas without a grid or those that frequently experience power outages, it is very practical. Especially for addressing lighting issues during outages, energy-saving DC lights can be used, making it very practical. Thus, the off-grid solar power system is specifically designed for use in places without a grid or in areas that frequently experience power outages.
In simple terms: grid-connected solar power systems do not require batteries, while off-grid systems do require batteries. For further detailed information about distributed photovoltaic power stations, please contact us!
