The off-grid energy storage system uses solar panels to convert solar energy into electrical energy when there is light, and powers the load through the solar charge and discharge controller, charging the batteries for off-grid living; when it is cloudy or without light, the off-grid battery pack supplies power to the DC load through the solar charge and discharge controller, and the off-grid battery also directly supplies power to the independent inverter, which is inverted into AC power through the independent inverter to supply power to the AC load. Now off grid lithium-ion battery is getting more popular.
The main task of the deep cycle off-grid batteries is to store energy, so as to ensure the load power at night or on rainy days. The number of off-grid batteries in series and parallel can be configured according to the requirements of the system's DC voltage level. When off-grid batteries are connected in series and parallel, they should follow the principles of the same model and specifications, the same manufacturer, the same batch, and simultaneous installation and use.
In recent years, in the field of off-grid energy storage, lithium batteries have gradually replaced traditional gel underground batteries and become the new favorite of the off-grid solar market. Generally, off-grid energy storage systems use off-grid lithium batteries, and using cost-effective off-grid solar lithium batteries can solve problems such as discontinuity of power supply and bottlenecks in the electricity. Off-grid lithium batteries can store electricity when the electric generator is working, and supply power to the electrical load when the generator stops.
Advantages of off-grid solar lithium battery:
High working voltage, high energy density, low self-discharge rate, no memory effect;
Lithium batteries can be made thinner (the thinnest polymer lithium battery is only 0.5mm) and smaller;
The area and shape can be changed at will, which greatly improves the flexibility of battery shape design. Manufacturers can make batteries of any shape and capacity according to the needs of users;
Compared with lead-acid batteries, lithium batteries are lighter and more durable, and have relatively less environmental pollution;
Frequent charging and discharging of the lithium battery, charging before it runs out, charging while using an external power, or continuing to use an external power after charging is completed, all of the situations above will not cause additional loss to the battery.
The off-grid solar system consists of solar battery packs, solar controllers, and battery (packs). If the output power is AC 220V or 110V, an off-grid special inverter is also required. And according to the different electricity demands, its configuration is a 12v off-grid solar system, 24v off-grid solar system, and 48 volts off-grid solar system, which are convenient and widely used.
The power supply advantages of off-grid solar systems are as follows:
1)Traditional wind power generation and solar power generation have their own shortcomings in resource utilization. In some areas, the sunshine duration is short or the wind is insufficient, so using wind power or solar power alone cannot meet the needs of the power supply. However, wind energy and solar energy are highly complementary. When there is no wind, there may be the sun, while there may be wind when there is no sun. The wind may be small when there is sufficient sunshine during the day, and the wind may be strong when there is no sunshine at night. The wind-solar hybrid power supply system is based on this principle to combine strengths and complement each other. This system makes up for the shortcomings of independent wind power and photovoltaic systems. It is a reasonable independent power supply system and a perfect combination of new energy comprehensive development and utilization.
2)The characteristics of regional off-grid independent power supply and household off-grid independent power supply are: Compared with grid-connected power generation, it has small investment, quick effect, and small area. The time from installation to coming into use depends on the amount of work, and it can be as little as one day, as much as two months, with no special person on duty, which is easy to manage.
3)The off-grid solar system is easy to install and use, and can be used by a family, a village, and a region, no matter individual or collective. In addition, the power supply area is small and clear, which is easy to maintain.
4)The off-grid solar system can be developed into a project that all sectors of society participate in its development due to its easy installation advantages. Therefore, it can effectively encourage and absorb funds lying idle in society to invest in the development of renewable energy and make the investment return, which is beneficial to the country, the society, the collective, and also the individual.
5) It solves the problem of being unable to supply power in remote areas and the problem of large loss and high cost of traditional power supply lines. The off-grid solar system not only eases the tight situation of electricity supply, but also realizes green energy, develops renewable energy, and promotes the development of the circular economy.