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:

The Solar Photovoltaic Power System Disadvantage

Recently years, solar energy have been great promoted and developed. In western country many households and organization have installed solar power system to power supply. Solar photovoltaic power system advantage have become more and more acceptance. In China, government also come on the policy to encourage people to use the solar pv system. However, when choose the solar pv system, need to consider the using solar photovoltaic system disadvantage.

First, the energy density is low, solar panels floor space are large. Although the sun is a tremendous source energy, deliver the total energy of the earth is also great, really exploited is little, the energy density is relatively low. At present, conversion efficiency of the solar panels are still too low, which requires using a large area of solar panels to absorb solar radiation to produce a certain amount of electricity.

Second , it has a great effected by weather change for the electric consumption.
Solar photovoltaic energy source is the sun light radiation, greatly affected by cloudy, rainy and fog days . Due to different geographical location, resources of sunshine is also great difference , and subject to geographical restrictions.

Last ,the home solar power system cost is relatively too high. Using the sun light is free, but a complete set of the system device is too high. For consumer, use the solar pv generation cost is much higher than the public supply system, so there is no cost advantage. It also has been the biggest obstacle to troubled people to install solar power systems. Whether it can save electric charge to Install home solar power system, many people think that is. For the large pv system that is, but for the ordinary households, to invest solar pv power generation have no cost advantage.

Although solar pv power system still have many insufficient, with the increasingly seriousness of energy crisis problem, it will be an effective way to great develop and use the new energy. With the government support and technology development, the advantage will be more and more significant.

The storage battery of solar pv power system installation methods

What matters need to be attention when install a solar photovoltaic power system? I think some new users are very care about it. Please carefully and patiently look up following :

In the process of installing solar pv power system, the storage battery is the battery components have been installed after another important work. Due to the battery lifespan is very susceptible to the environment,  specially high temperature and humid environment will greatly shorten the service life of battery. Therefore, battery should be installed in a well ventilated, moistureproof and dry environment as far as possible. In addition, taking into account the efficiency and security of the system, when install a small power system, the solar storage battery should be located as close as possible to the solar battery board and a controller; while in large power system, solar storage batteries have been better divide with the controller, inverter and AC power distribution cabinet to open placed.

Before placing, between solar generator battery and ground should be taken insulation measures, in order to avoid the battery and ground short circuit and discharge. It is very easy to solve these problems , generally can choose dry wood or other insulating object . If there are more batteries, should consider to choose battery special bracket and then stents grounding which is more reliable.

After installation, need to measure the total and single voltage of the battery , a single battery’s voltage must be equal. It should be noted that when wiring need to distinguish clearly positive and negative pole, should not be reversed. In order to ensure the quality of wiring, batteries must be in close contact between the electrode and wiring note ,and in electrode note and the connecting point coated with a layer of vaseline oil film, to prevent poor contact caused by corrosion and rust after too long time. Besides, due to the battery is a flammable object, should be paid special attention to fire prevention measures.

I hope above methods can help you when want to install a solar pv power system. If there still have questions, welcome to contact us.

The advantage of home solar photovoltaic power plant

In recent years, our country to support the introduction and implementation of different kinds of subsidy policy rules for photovoltaic power generation, home distributed solar photovoltaic power plant have been continuously increased in different areas , and into a blowout development.

The National Energy Bureau released the latest energy plan that will be in the Twelfth Five Year Plan of photovoltaic power generation installed capacity increased to 35gw, about 3500 billion of photovoltaic power generation market, which 2014 new photovoltaic power generation installed capacity to 14gw, distributed photovoltaic power plants accounted for 8GW, sustainable future national policy support will cultivate trillion level distributed photovoltaic power plant market.

Home solar PV power plant have five strong advantages as following :

1. Simple system installed and maintenance : high safety factor;

2. Can used our own power : The extra power can be sold to country’s;

3. Big policy-supported: Passed acceptance can be obtained by national and provincial level special subsidies for distributed solar photovoltaic power generation;

4. 5 years quality warranty : By the China Life Insurance Company of the quality of underwriting

5. High return : In case of Nanjing, residents spent 50,000 yuan invest one set of 5kw PV system, with an annual power generation of about 6080 degrees, per kilowatt obtained by national and provincial level subsidies total is 1.2 yuan, one year of generation comprehensive income about 7300 yuan, selling electricity revenues only need 6.8 years to recover cost, the annual rate of return of nearly 15 % , much higher than bank interest rates. Solar photovoltaic power products are available for 25 years, nearly 20 years to get a steady stream of fixed income after recover the cost.

Besides, with the popularity use of home solar photovoltaic power system, will be made an effort to reduce the fog and improve environment. 

If you think about the cost investment, I think we can start the portable solar generator first, to power some small appliances like light, fans etc... How about your ideas ? ??