What is off-grid solar power generation ?

Off-grid solar power generation is to add a set of solar power generation systems to the traditional power supply system, so that the system is not restricted by the region, to solve the problem that the system is difficult to obtain electricity in remote areas. The solar power generation system is divided into distributed power generation systems, off-grid power generation systems, and grid-connected power generation systems. It is mainly composed of a solar controller, solar panel, and battery (group). In addition, if we want the output power to be 220V or 110V, we also need to configure the inverter based on the original configuration.

What is the advantage and disadvantages of off-grid solar generation?

Solar power supply system has several remarkable characteristics, such as automatic control of power generation system equipment operation, can achievement unattended; Management and maintenance are simple and convenient, the operation cost is very low; The service life of the main parts is more than 20 years; An investment, long-term benefits; But many people do not know the difference between off-grid and grid-connected photovoltaic power generation. When purchasing supporting products of photovoltaic power generation systems, I do not know how to choose off-grid inverters and grid-connected inverters. Now let's look at the pros and cons of both.

Independent operation of an off-grid power generation system is a power generation system that does not depend on the power grid. When there is light, the solar panels convert the energy into electricity, which is powered by the inverter to the load, while charging the battery. When there is no light, the battery will supply power to the AC load through the inverter. The off-grid power generation system can store electric energy, with energy independence, and high sustainability, not restricted by the grid. It is suitable for less developed areas or remote areas without a power grid, such as islands, wilderness, bases, etc., and is very suitable for emergency power generation equipment. However, photovoltaic off-grid power generation systems must be equipped with batteries, whose service life is generally within 3-5 years, after which they need to be replaced. From an economic point of view, it is difficult to be widely promoted and used and is not suitable for use in places where electricity is convenient.

Photovoltaic grid connection must be connected to the public grid, that is, solar power generation, home grid, and public grid together. Photovoltaic grid-connected power generation system does not need to use batteries, saving operating costs. According to the license policy, households can be connected to the grid for free, and surplus electricity can be sold to power companies. From the long-term perspective of investment, you can recover the cost and have additional income. Therefore, if you want to save the cost of electricity and the power supply is convenient, choose the grid-connected solar power system, which is also the current mainstream way. But the system has to rely on the existing grid to operate, and when the public grid is cut off, the photovoltaics cannot operate either.

How to Choose the suitable off-grid solar power generation?

As technology improves, the cost gap between off-grid and grid-connected solar power systems is narrowing. In addition to the type and quality of components (product quality has a greater impact on the decay rate, such as the degree of sealing, the presence of impurities, whether hidden cracks, etc.), the biggest impact on the power generation and income is the suitability of each accessory of the photovoltaic power generation system, whether the construction and installation are standardized, although other accessories although the proportion of the total cost is not high, but not negligible.

Many people don't know which points to focus on when choosing a photovoltaic system the following points are for your reference.

1. Where is the solar power system used? How is the solar radiation in the area?

2. What is the load power of the system?

3. What is the output voltage of the system, DC or AC?

4. How many hours does the system need to work every day?

5. If there is rainy weather without sunlight, how many days does the system need to supply power continuously?

6. The condition of the load, purely resistive, capacitive, or inductive, what is the starting current?

How to the maintenance of off-grid solar power generation？

Solar power system maintenance includes solar panel cleaning, photoelectric conversion efficiency testing, steel support, and solar inverter maintenance. And equipment wiring and grounding check. Clean solar panels once every half a month. The maintenance of photovoltaic panels is mainly to see whether the solar power supply system and battery pack are in normal operation. Each solar panel and solar system line and line connection, each group of a photovoltaic panel is normal operation. The connection condition of the solar cell, formwork, molding glass, and frame looseness and breakage. This should be recorded in the maintenance/repair log. If damaged, replace it immediately or plan to replace it.