The residential energy storage system is becoming more and more popular with residential solar users. According to a recent survey by solar power generation developer Sunpower, about 40%of Americans expressed concern about frequent power outages. Among the respondents who have installed solar power generation facilities, 70%of the respondents stated that they planned to install a battery energy storage system. However, the facts show that a variety of factors will affect the life of the home battery storage system.
In addition to providing spare power supply during power outages, many battery energy storage systems also allow intelligent dispatching power to input and output. This is to maximize the value of the residential solar power system. Moreover, some battery energy storage systems can be integrated into electric vehicle charging facilities.
Although the installed capacity of the deployment of the energy storage system is steadily rising, its supporting deployment rate is still low. According to data released by Lawrence Berkeley National Laboratory (LBL), in 2020, 8.1%of the US residential solar system supporting battery storage system.
There are many options for residential battery energy storage systems. But in the United States, two manufacturers dominate the field of residential battery energy storage. According to a survey by the Lawrence Berkeley National Laboratory (LBL), LG Chem and Tesla account for more than 90%of the US residential energy storage market, of which Tesla has more than 60%of the market share.
Tesla PowerWall battery energy storage system has a limited warranty clause, claiming that there will be no defects within 10 years after installation. It also guarantees that the initial capacity of the PowerWall battery energy storage system is 13.5kWh, and it will ensure its energy storage capacity according to the degraded timetable.
LG CHEM said its energy storage system will maintain more than 60%of energy storage capacity (9.8 kWh) within 10 years. The battery must work between -10 ° C and 45 ° C to maintain the warranty range.
SUNRUN, a residential solar installation dealer, said that batteries can usually be used for 5 to 15 years. This means that in the 20 to 30 years of life cycle of solar power generation facilities, the battery energy storage system is likely to be replaced.
The battery life is mainly determined by the use cycle. As LG Chem and Tesla's product warranty proof, in a certain charging cycle, it is guaranteed to reach 60%or 70%of the capacity threshold.
The Faraday Research Institute stated that there are two types of use scenarios in battery degradation: over -charging and trickle charging. Over -charging is the behavior of injecting the current and filled with the battery. This will cause the battery to overheat or even get angry.
The trickle charging refers to the process of continuously charging the battery to 100%. The battery capacity will inevitably lose losses in this process. This process will increase the internal temperature and reduce the capacity and life.
The Faraday Research Institute pointed out that over time, another reason for degeneration is the loss of lithium ions in the electrolyte in the battery. The side effects in the battery will capture available free lithium, thereby gradually reducing capacity.
Although low temperature will stop the lithium ion battery, they will not actually degenerate or shorten the effective life. The Faraday Research Institute stated that the overall life of the battery will decrease at high temperature. This is because the electrolyte between the electrodes is decomposed at high temperature, causing the battery to lose the ability to flow lithium ion flow. This will reduce the number of lithium ions that can be accepted into its structure, and exhaust the capacity of lithium ion battery.
The National Renewable Energy Lab (NREL) recommends that the home users install the battery in a cool and dry place, preferably the garage, which can minimize the influence of fire. The battery and the surrounding components should have properly in order to cool, and regular maintenance inspections can help ensure the best operation.
The United States National Renewable Energy Lab (NREL) said that the battery is duplicated as much as possible, because the more discharge, the shorter the life span. If the residential battery energy storage system is discharged in large quantities every day, it will increase the battery pack.
The battery series should be maintained. Although the battery pack may display the total power of 24V, there may be different voltages between the batteries, which is not good for the long -term operation of the battery energy storage system. In addition, it is recommended to set the correct voltage setting point for the charging and charging controller according to the decision of the battery manufacturer.
The National Renewable Energy Lab (NREL) said operation and maintenance personnel should be checked frequently. The content that needs to be checked includes leaks (accumulated outside the battery) and whether the voltage is consistent.
