In addition to providing backup power in case of power failure, many battery energy storage systems also allow intelligent dispatching of power input and output, which is to maximize the value of residential solar power generation system. Moreover, some battery energy storage systems have been optimized and can be integrated into electric vehicle charging facilities.
Although the installed capacity of the deployed solar panel home battery energy storage system is rising steadily, its supporting deployment rate is still very low. According to the data released by Lawrence Berkeley National Laboratory (LBL), 8.1% of residential solar energy systems in the United States will be equipped with battery energy storage systems in 2020.
There are many options for residential home battery for solar energy storage systems. However, in the United States, two manufacturers dominate the field of residential battery energy storage. According to the survey of Lawrence Berkeley National Laboratory (LBL), LG Chem and Tesla occupy more than 90% of the residential energy storage market in the United States, and Tesla owns more than 60% of the market share.
Tesla PowerWall battery energy storage system has a limited warranty, claiming that it will not have any defects within 10 years after installation. It also guarantees that the initial capacity of the PowerWall battery energy storage system is 13.5kWh, and will guarantee its energy storage capacity according to the degradation schedule.
The National Renewable Energy Laboratory (NREL) recommends that household users install wall mounted lithium batteries in a cool and dry place, preferably a garage, to minimize the impact of fire. The battery and its surrounding parts shall have proper cooling space, and regular maintenance and inspection will help to ensure optimal operation.
LG Chem said that its energy storage battery system will maintain more than 60% of its energy storage capacity (9.8 kWh) within 10 years. The battery must operate between - 10 ℃ and 45 ℃ to maintain the warranty.Battery life
Sunrun, a residential solar installer, says that batteries can normally last five to 15 years. This means that during the 20-30 year life cycle of the solar power generation facility, it is likely that the battery energy storage system will need to be replaced.
The battery life is mainly determined by the service life. As demonstrated by the product warranty of LG Chem and Tesla, it is guaranteed that the capacity threshold of 60% or 70% can be reached within a certain charging cycle.
According to Faraday Research Institute, there are two use scenarios leading to battery degradation: overcharging and trickle charging. Overcharging is the act of injecting current into and charging the battery. Doing so will cause the battery to overheat and may even catch fire.
Trickle charging refers to the process of continuously charging the battery to 100%. The battery capacity will inevitably be lost in this process, which will increase the internal temperature and reduce the capacity and life.
Faraday Research Institute pointed out that over time, another reason for degradation is the loss of lithium ions in the electrolyte of the battery. The side effects in the battery will capture the available free lithium, which will gradually reduce the capacity.
Although low temperature will stop the lithium ion battery from working, they will not actually degrade the battery or shorten its effective life. Faraday Research Institute said that the overall life of the battery will be reduced at high temperatures. This is because the electrolyte between the electrodes decomposes at high temperatures, resulting in the loss of lithium ion flow capacity of the battery. This will reduce the number of lithium ions that can be accepted by the electrode into its structure and deplete the capacity of the lithium ion battery.
Maintenance matters
The National Renewable Energy Laboratory (NREL) recommends that household users install batteries in a cool and dry place, preferably a garage, to minimize the impact of a fire. The battery and its surrounding components shall have proper space for cooling, and regular maintenance and inspection shall help to ensure optimal operation.The National Renewable Energy Laboratory (NREL) recommends that household users install wall mounted lithium batteries in a cool and dry place, preferably a garage, to minimize the impact of fire. The battery and its surrounding parts shall have proper cooling space, and regular maintenance and inspection will help to ensure optimal operation.
The National Renewable Energy Laboratory (NREL) of the United States said that repeated deep discharge of batteries should be avoided as much as possible, because the more discharge, the shorter the life. If the residential battery energy storage system discharges a lot every day, it will be time to add batteries.
The batteries in series shall maintain the same power. Although the battery pack may display the total power of 24V, there may be different voltages between batteries, which is unfavorable to the long-term operation of the battery energy storage system. In addition, it is recommended to set the correct voltage set points for the charger and charge controller according to the battery manufacturer's decision.
The National Renewable Energy Laboratory (NREL) of the United States said that the operation and maintenance personnel should check frequently. The items to be checked include leakage (accumulation outside the battery) and whether the voltage is consistent
