Eternal Inverter 
In modern energy solutions, off-grid hybrid solar system, as an independent power supply mode, is increasingly favored by remote areas and specific application scenarios. Battery energy storage is a key part of the system. The solar panels responsible for storage generate dozens of times of electricity during the day and provide stable power support for the multiplier load when there is no sunshine. Through reasonable battery selection and management, the off-grid solar system can realize more efficient energy utilization, and ensure the system to run continuously and stably without relying on the commercial power
Basic concept and function of battery storage
Battery storage refers to storing excess electric energy for use when needed. In the solar energy system, the battery stores the surplus power generated by solar panels during the day for use at night or on cloudy days when there is no sunshine. The main functions include: Energy storage; Ensure a stable supply; Optimize energy utilization; Improve system reliability
How to improve the energy self-sufficiency of the system by batteries
Energy storage function: during the day, the surplus power generated by solar system will be stored in the battery to prepare for subsequent use
Power supply at night: the battery provides the required power at night without sunshine or cloudy days to ensure the continuous operation of equipment and household appliances
Reduce grid dependence: by storing and releasing power, the battery reduces its dependence on the traditional grid, enabling the off-grid system to supply power independently
Stable system operation: the battery can also balance the power supply fluctuation, keep the system stable and improve the overall efficiency and reliability
Relationship between battery storage and energy efficiency
Battery storage is closely related to energy efficiency, especially in off-grid solar systems, the role of batteries is to improve energy utilization and reduce waste. Its main relationship is reflected in the following aspects:
- Maximize the utilization of solar energy: the battery stores the excess solar power during the day to avoid the excess power generated during the day being wasted. In this way, the system can use the stored power for the sunless period, thus improving the utilization efficiency of solar energy
Balance the difference between supply and demand: the power stored by the battery can be used during the peak demand period or when the sunshine is insufficient, effectively balancing the energy demand during the day and at night, and reducing the energy shortage
Reduce the energy loss of the system: battery storage can reduce the loss in the process of energy conversion under certain conditions, for example, the stored power is directly used for the load, avoiding the loss caused by power transmission through the power grid
Reduce dependence on commercial power: by storing and releasing energy, the battery reduces its dependence on commercial power, reduces the frequency of grid power use, and further improves the overall energy efficiency of the system
Improve the overall efficiency of the system: the battery helps to balance power supply fluctuation and load change, ensure the efficient operation of the system, and minimize energy waste, thus improving the energy efficiency of the whole solar system
Charging and discharging process of battery
Charging process:
Constant current charging: when the battery voltage is low, the charger charges the battery with a constant current. At this stage, the charging current is large, and the battery voltage gradually rises
Constant voltage charging: when the battery voltage is close to the rated voltage, the charger will change to constant voltage charging. At this stage, the charging current will gradually decrease to prevent the battery from overcharging
Trickle charging: When the battery voltage reaches the full charging level, the charger will switch to low-current trickle charging to keep the battery fully charged and prevent the battery from over-discharge
Discharge process:
High discharge current stage: when the battery starts to discharge, the load demand is high, and the battery releases the stored energy with high current. At this stage, the battery voltage will drop slightly
Low discharge current stage: when the battery capacity decreases, the discharge current usually decreases, and the battery voltage gradually decreases until it reaches the set cut-off voltage
Battery life and maintenance
Generally speaking, the battery life will be affected by the following factors:
Depth of charge and discharge (DOD): the depth of discharge of a battery has a great influence on its life
Charging frequency: frequent charging and discharging will increase the wear and tear of the battery, thus shortening its service life.
Temperature: the aging of the battery will be accelerated when it is operated at high or low temperature, and the ideal working temperature is usually between 20-25°C
Battery type: different types of batteries have different service life. For example, lead-acid batteries usually have a short life cycle, while lithium batteries have a long service life.
Battery maintenance measures can be divided into the following categories:
Regularly check the voltage, current, temperature and other parameters of the battery pack to ensure that it is within the normal working range
Try to avoid deep discharge of batteries, especially lead-acid batteries and lithium batteries
Maintain an appropriate working temperature, usually at 20-25°C
Keep the battery balanced, thus prolonging the overall service life of the battery pack
Generally speaking, the battery is very important in the off-grid hybrid system, which directly affects the stability and energy saving efficiency of the system. Choosing the right battery, regular maintenance and monitoring are the keys to ensure the long-term operation of the system. Through scientific management, the off-grid system can provide reliable green energy without commercial power. If you have questions about battery selection or system optimization, please feel free to contact us and we will provide professional support.