Introduction Of Household Energy Storage Systems
In September 2020, our country promised in the United Nations General Assembly that carbon peaks in 2030 and carbon neutrality in 2060. 2021 is the first year of the "14th Five-Year Plan". The Central Economic Work Conference will "do a good job in achieving carbon peaks and carbon neutrality." "As one of the key tasks this year, the photovoltaic + energy storage system is an important way to achieve carbon neutrality. This article will focus on the types and characteristics of common household photovoltaic + energy storage systems.(New Energy Storage)
Hybrid home PV + energy storage system
System Introductions:
Hybrid photovoltaic + energy storage systems generally consist of photovoltaic modules, lithium batteries, hybrid inverters, smart voltmeters, CT, grid, grid-connected loads, and off-grid loads. The system can directly charge the battery through DC-DC conversion from photovoltaics, and can also achieve bidirectional DC-AC conversion for battery charging and discharging.
Working Principle
During the day, photovoltaic power firstly supplies the load, then charges the battery, and finally the excess power can be connected to the grid; At night, the battery discharge supplies the load, and the insufficient part is supplemented by the power grid. When the power grid fails, photovoltaic power generation and lithium battery only supply power to off-grid load, and the load at the grid-connected end cannot be used. In addition, the system also allows users to set their own charging and discharging time to meet their electricity needs.
System features
· The system is highly integrated, which can greatly reduce the system installation time and cost
· Intelligent control can be realized to meet the power demand of users
· It can provide users with safe power guarantee when power grid fails
Coupled home PV + energy storage system
System Introductions
The coupled PHOTOVOLTAIC + energy storage system, also known as the AC retrofit photovoltaic + energy storage system, is generally composed of photovoltaic modules, grid-connected inverters, lithium batteries, AC coupled energy storage inverters, smart meters, CT, power grid, grid-connected load and off-grid load. In this system, photovoltaic power can be converted into AC power by grid-connected inverter, and then converted into DC power by AC coupled energy storage inverter and stored in the battery.
Working Principle
During the day, photovoltaic power firstly supplies the load, then charges the battery, and finally the excess power can be connected to the grid; At night, the battery discharge supplies the load, and the insufficient part is supplemented by the power grid. When the power grid fails, photovoltaic power generation and lithium battery only supply power to off-grid load, and the load at the grid-connected end cannot be used. In addition, the system also allows users to set their own charging and discharging time to meet their electricity needs
System features
· The existing grid-connected photovoltaic system can be transformed into energy storage system with low investment cost
· It can provide users with safe power protection in the event of a power outage
· It can compatible with grid-connected photovoltaic systems from different manufacturers
Off-grid home PV + energy storage system
System introductions
Off-grid home photovoltaic + energy storage systems generally consist of photovoltaic components, lithium batteries, off-grid energy storage inverters, loads and diesel generators. The system can directly charge the battery through DC-DC conversion from photovoltaics, and can also achieve bidirectional DC-AC conversion for battery charging and discharging.
Working principle
During the day, photovoltaic power generation supplies the load first, and then charges the battery; at night, the battery discharges to supply the load, and when the battery is insufficient, the diesel generator supplies the load.
Systems features
· It can meet the daily electricity demand in areas without grid
· It can be combined with diesel generator to supply load or charge battery
· Most off-grid energy storage inverters have no grid-connected certification, even if the system has a grid, it cannot be connected to the grid
Photovoltaic energy storage energy management system
System introduction
Photovoltaic energy storage energy management system, which generally consists of photovoltaic components, grid-connected inverters, lithium batteries, AC-coupled energy storage inverters, smart meters, CT, power grids, and control systems.
Hybrid home PV + energy storage system
System Introductions:
Hybrid photovoltaic + energy storage systems generally consist of photovoltaic modules, lithium batteries, hybrid inverters, smart voltmeters, CT, grid, grid-connected loads, and off-grid loads. The system can directly charge the battery through DC-DC conversion from photovoltaics, and can also achieve bidirectional DC-AC conversion for battery charging and discharging.
Working Principle
During the day, photovoltaic power firstly supplies the load, then charges the battery, and finally the excess power can be connected to the grid; At night, the battery discharge supplies the load, and the insufficient part is supplemented by the power grid. When the power grid fails, photovoltaic power generation and lithium battery only supply power to off-grid load, and the load at the grid-connected end cannot be used. In addition, the system also allows users to set their own charging and discharging time to meet their electricity needs.
System features
· The system is highly integrated, which can greatly reduce the system installation time and cost
· Intelligent control can be realized to meet the power demand of users
· It can provide users with safe power guarantee when power grid fails
Coupled home PV + energy storage system
System Introductions
The coupled PHOTOVOLTAIC + energy storage system, also known as the AC retrofit photovoltaic + energy storage system, is generally composed of photovoltaic modules, grid-connected inverters, lithium batteries, AC coupled energy storage inverters, smart meters, CT, power grid, grid-connected load and off-grid load. In this system, photovoltaic power can be converted into AC power by grid-connected inverter, and then converted into DC power by AC coupled energy storage inverter and stored in the battery.
Working Principle
During the day, photovoltaic power firstly supplies the load, then charges the battery, and finally the excess power can be connected to the grid; At night, the battery discharge supplies the load, and the insufficient part is supplemented by the power grid. When the power grid fails, photovoltaic power generation and lithium battery only supply power to off-grid load, and the load at the grid-connected end cannot be used. In addition, the system also allows users to set their own charging and discharging time to meet their electricity needs
System features
· The existing grid-connected photovoltaic system can be transformed into energy storage system with low investment cost
· It can provide users with safe power protection in the event of a power outage
· It can compatible with grid-connected photovoltaic systems from different manufacturers
Off-grid home PV + energy storage system
System introductions
Off-grid home photovoltaic + energy storage systems generally consist of photovoltaic components, lithium batteries, off-grid energy storage inverters, loads and diesel generators. The system can directly charge the battery through DC-DC conversion from photovoltaics, and can also achieve bidirectional DC-AC conversion for battery charging and discharging.
Working principle
During the day, photovoltaic power generation supplies the load first, and then charges the battery; at night, the battery discharges to supply the load, and when the battery is insufficient, the diesel generator supplies the load.
Systems features
· It can meet the daily electricity demand in areas without grid
· It can be combined with diesel generator to supply load or charge battery
· Most off-grid energy storage inverters have no grid-connected certification, even if the system has a grid, it cannot be connected to the grid
Photovoltaic energy storage energy management system
System introduction
Photovoltaic energy storage energy management system, which generally consists of photovoltaic components, grid-connected inverters, lithium batteries, AC-coupled energy storage inverters, smart meters, CT, power grids, and control systems.
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