What Is Different Between Off Grid And On Grid Solar PV Power System ?

When you install home solar power PV system, first need to confirm that to install off grid solar power kit or on grid solar power kit. These are two kinds solar power system, the using function and cost have a big different . However, many users don’t understand what different between off grid and on grid system, here I can tell something :

First, off grid solar power system.
which also called independent pv power system, and don’t depends on power grid to independent operation, mainly include solar panel , storage battery, charge controller and inverter etc.. Electricity by solar panels generated directly into the battery and storage it .when need to electrical power supply, DC current in the storage battery through the inverter and converted into 220V alternating current, which is a repeated cycle of charging and discharging process. The power system due to don’t subject to geographical restrictions, it is widely used.  where there is sunlight there can install and use the off grid solar system. Therefore, it is very suitable to use for remote areas without power grid, island, fishing, outdoor breeding base etc. . can also be as emergency power generation equipment for frequent power outages area.

Due to this system need to be equipped with batteries, and occupied the cost of power generation system 30-50%. And the service life of the battery generally in 3-5 years, later to be replaced it, that increased more using cost. If for economy, it is difficult to promotion for a wide range of use , so do not suitable for convenient using electricity place.

But for the non-power grid area or frequent power outages families, has a strong practicality. Especially for solving the problem of power failure, to use DC energy-saving lamps is very practical.

Hence, off grid solar power system is specialized for no power grid or frequent power outages areas to use.

Second, on grid solar power system

On grid, means must be connected to the public power grid, and connect to solar power, home power grid and public power grid, which is a power system that must depends on existing power grid to run. Mainly consists of solar panels and inverter, the solar panels generate electricity and directly transformed into AC 220V by inverter and to power home appliances, when the solar energy generating capacity is more than the use of household appliances consumption, excess electricity will be transported to the public grid; while the solar energy generating capacity can not meet the household appliances use , it will automatically from the grid supplement. This whole process is intelligent control, do not need to artificially on or off.

Because this on grid solar power system can avoid using batteries, greatly saves the cost of the system, especially this year 3 copies issued by the State Grid about solar energy and other new energy grid deal used has made it clear that allowed free network, excess electricity can also be sold to power companies. From the long-term perspective of investment, cost recovery and after several years maybe have a profitable. Therefore, if you want to save electricity costs and convenient power supply , can choose the on grid solar power system, which will be the mainstream way in currently or in the future.

Whereas, on grid solar power system also have shortage, when the public power grid outage, the solar pv power system can not operate.

The different map of off grid and on grid solar pv power system as following:

How much a complete home solar power kits to be installed ?

“How much a complete home solar power kits to be installed ?” this is the customers are most concerned about. Before answer this question, you should confirm that to install off grid solar power system or on grid solar power system. Because these two installation cost have great differences. For the same capacity power system, due to release energy storage devices the using cost of on grid system have great reduced.

From the system components, include solar panel, storage battery, controller and inverter. But each component selection have a great space , how much wattage for the solar panel to be chosen? how many capacity for the battery? Those all depend on the user's electricity utilization situation, how much is the electricity per month? What are the main power appliances? Where to be used? Only to make clear the problem first , then engineers can work out the suitable solar power system for users. That is to say, solar power system is based on the users’ electricity utilization and requirement to produce. Because every household’s electricity utilization is different, there is no uniform standard to design the solar power system.

For on grid solar power system, because connect to the public power grid, when power surplus it will be transported to the power grid, power is insufficient and will be input from the grid. Therefore, customers can choose power supply for some household appliances ,can also choose to supply for all . The system can according to user's economic investment, can either be big or small.

As the off grid solar power system, the capacity have a great flexibility, no standard product configuration. It according to the user’s location and electricity utilization, the product configuration is different. There is no doubt, greater system capacity, needs driven electrical power is greater, cost will be higher and higher. For those who need to drive high power electrical appliances such as air-conditioner and induction cooker, requirements of the system capacity is not small, and cost will be much higher.

So, customers before asking price, to their own situation have a number in mind, the basic problem is how much daily electricity consumption is or what appliances will be used and how long be used in the day time. After Engineers know how to calculate the capacity and configuration of your home solar power kits, so that can probably calculate the required capacity of the system and the key components of the selection and design, and customized to meet the condition of the electric power system, to achieve both practical and affordable.