Difference Between grid-tie and off-grid solar power generation system

Today, I want to share with you the question of whether it is better to install an On-grid or Off-grid system in your home.

In simple terms, off-grid systems rely on solar energy to store to a storage battery and then turn it into a 220V voltage for household use through an inverter.

The grid-connected system is connected to the utility grid, and the electricity generated by the grid-connected solar system is not stored in a storage device.

But it is directly converted into the national power grid to meet the requirements of the grid-connected voltage and prioritized for household use, and the unused electricity can be sold to the state.

Here's a more detailed explanation to you

Grid Tie Solar Power Generation System

First, Grid-connected solar power generation system is connected to the public grid, that is, solar power generation system, home grid, public grid together, which must rely on the existing power grid to run the power generation system.

It is mainly composed of PV modules and inverter, the solar panels are directly converted into 220V AC power by the inverter and supply electricity to household appliances, when the solar power generation capacity exceeds the electricity used by household appliances, the excess electricity is delivered to the public power grid;

When the solar power generation capacity cannot satisfy the household appliances, it is automatically supplemented from the grid power. This whole process is intelligently controlled and does not require human switching on or off.

This system saves significantly on the cost of the system as it eliminates the use of batteries, and the excess electricity can be sold to the power company.

In the long run of the investment, it will be possible to recover the cost and be profitable in a number of years. Therefore, grid-connected solar power systems are the way to go if you want to save money on electricity bills and have a convenient power supply.

However, grid-connected systems have the disadvantage that solar PV cannot operate when the public grid is down.

Off Grid Solar Power Generation System

Second, Off-grid solar power generation system, also known as independent solar power generation system, is not dependent on the grid.

It is mainly composed of solar panels, energy storage batteries, charge and discharge controller, inverter and other components.

The electricity from the solar energy directly into the battery and stored, When it is needed to power an appliance, the DC current in the battery is converted by the INVERTER TO 220V AC, it is a repetitive cycle of charging and discharging process.

The installation of this kind of solar power generation system is not limited by the region.

It is widely used in the area as long as there is sun shining, so it is very suitable for remote areas without power grid, isolated islands, fishing boats, outdoor breeding base, etc.,

The off-grid solar power system can also be used as emergency power generation equipment in areas with frequent power outages.

This kind of system must be equipped with batteries that occupy 30-50% of the solar power plant cost. Moreover, the life span of the battery is about 3-5 years, after which it has to be replaced, which increases the use cost. Economically speaking, it is difficult to get a wide range of popular use, so it is not suitable for using in places where electricity is convenient.

However, they are highly practical for households in areas without power grids or in areas with frequent power outages. Particularly for the sole purpose of solving lighting problems during power outages, this solar system can be illuminated by DC energy-saving lamps, which is very practical.

Therefore, off-grid solar power systems are specifically designed for use in places in off-grid areas or areas with frequent power outages.