Types Of Household Energy Storage Systems
Aug 31, 2022
This article introduces several types of household energy storage systems that are currently used more.
1. Hybrid home photovoltaic + energy storage system
The system generally consists of photovoltaic modules, lithium batteries, hybrid inverters, smart meters, CTs, power grids, grid-connected loads and off-grid loads.
working principle
During the day, the photovoltaic power generation first supplies the load, then the battery is charged, and finally the excess power can be connected to the grid; at night, the battery is discharged to supply the load, and the insufficient part is supplemented by the power grid; when the power grid is out of power, the photovoltaic power generation and lithium battery only supply power to the off-grid load, which is connected to the grid. End loads are not available. In addition, the system also supports the user to set the charging and discharging time to meet the user's electricity demand.
System Features
(1) The system is highly integrated, which can greatly reduce the system installation time and cost.
(2) Intelligent control can be realized to meet the user's electricity demand.
(3) When the power grid is out of power, it can provide users with safe power protection.
2. Coupled home photovoltaic + energy storage system
The system generally consists of photovoltaic modules, grid-connected inverters, lithium batteries, AC-coupled energy storage inverters, smart meters, CTs, power grids, grid-connected loads and off-grid loads. The system can realize that after the photovoltaic is converted into alternating current by the grid-connected inverter, the excess power is converted into direct current by the AC-coupled energy storage inverter and stored in the battery.
Working Principle
During the day, the photovoltaic power generation first supplies the load, and then charges the battery, and finally the excess power can be connected to the grid; at night, the battery is discharged to supply the load, and the insufficient part is supplemented by the grid; when the grid is powered off, the lithium battery only supplies power to the off-grid load, and the grid-connected load cannot be connected. use. In addition, the system also supports the user to set the charging and discharging time to meet the user's electricity demand.
System Features
(1) The existing grid-connected photovoltaic system can be transformed into an energy storage system, and the input cost is low.
(2) When the power grid is out of power, it can provide users with safe power protection.
(3) Compatible with grid-connected photovoltaic systems from different manufacturers.
3. Off-grid home photovoltaic + energy storage system
The system generally consists of photovoltaic modules, lithium batteries, off-grid energy storage inverters, loads and diesel generators. The system can realize the direct charging of the battery by the photovoltaic through DC-DC conversion, and can also realize the bidirectional DC-AC conversion for the charging and discharging of the battery.
Working Principle
During the day, the photovoltaic power generation first supplies the load, and then charges the battery; at night, the battery is discharged to supply the load, and when the battery is insufficient, the diesel generator supplies the load.
System Features
(1) It can meet the daily electricity demand in areas without power grid.
(2) It can be combined with diesel generator to make diesel generator supply load or charge battery.
(3) Most off-grid energy storage inverters do not have grid-connected certification, so even if the system has a grid, it cannot be connected to the grid.
4. Photovoltaic energy storage energy management system
The system generally consists of photovoltaic modules, grid-connected inverters, lithium batteries, AC-coupled energy storage inverters, smart meters, CTs, power grids and control systems.
System Features
(1) The control system can receive and respond to external commands, respond to the power demand of the system, and accept the real-time control and scheduling of the system.
(2) Participate in the optimal operation of the power grid, making the use of electric energy more efficient and economical.
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