Introduction to four types of household energy storage systems

With the rise in electricity bills and the increasing electricity demand, more and more people are installing solar systems at home. Its core is a rechargeable energy storage battery, usually based on lithium-ion or lead-acid batteries, controlled by a computer, and coordinated by other intelligent hardware and software to achieve charging and discharging cycles.

1. Hybrid photovoltaic energy storage system

It can directly charge a battery through DC-DC conversion of photovoltaic energy, and can also achieve bidirectional DC-AC conversion for battery charging and discharging.

In short, during the day, photovoltaic power generation first supplies the load, then charges the battery, and finally, the excess electricity 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 cut off, photovoltaic power and lithium batteries only supply power to the off-grid load, and the grid-connected load cannot be used. In addition, the system also supports users to set their own charging and discharging times to meet their electricity needs.

Components: photovoltaic modules, lithium batteries, hybrid inverters, smart meters, CT, power grid, grid-connected loads, and off-grid loads

Features:

• Highly integratedsystem which significantly reduces system installation time and costs.
• Intelligent control to meet users' electricity needs.
• Safe electricity protection when the power grid is cut off.

2. Coupled household photovoltaic energy storage system

It usually refers to as an AC-modified photovoltaic energy storage system. This system can convert photovoltaic energy into AC power through a grid-connected inverter, and then convert excess electricity into DC power through an AC-coupled energy storage inverter for storage in the battery.

Components: photovoltaic modules, grid-connected inverters, lithium batteries, AC-coupled energy storage inverters, smart meters, CT, power grid, grid-connected loads, and off-grid loads

Features:

• Transforming grid-connected photovoltaic systems into energy storage systems, with low investment costs.
• Safe electricity protection in case of power outages.
• Compatible with grid-connected photovoltaic systems from different manufacturers.

3. Off-grid householdphotovoltaic energy storage system

It can directly charge the battery through DC-DC conversion of photovoltaic energy, and can also achieve bidirectional DC-AC conversion for battery charging and discharging. In short, during the day, photovoltaic power supplies the load first, and then charges the battery; at night, the battery is discharged to supply the load, and the load is supplied by the diesel generator when the battery is insufficient. Acoucou batteries are mainly applied for off-grid system to help people store their excess energy. It can be charged by solar panels, charger and generator so that we can get rid of the impact of the grid and ensure normal usage of electricity as usual while encountering emergencies.

Components: photovoltaic modules, lithium batteries, off-grid energy storage inverters, loads, and diesel generators

Features:

• It can meet the daily electricity demand in the areas without power grids.
• It can be combined with a diesel generator to supply the load or charge the battery.

4. Photovoltaic energy storage energy management system

It is intelligent, and the control system can receive and respond to external commands, respond to the system's electricity demand, and receive real-time control from the system. It can participate in the optimization operation of the power grid, making the use of electricity more efficient and economical.

Components: photovoltaic modules, grid-connected inverters, lithium batteries, AC-coupled energy storage inverters, smart meters, CT, power grids, and control systems

With the support of policies and changes in people's attitudes, we believe that more and more types of household energy storage systems will appear around us.