Main types of household photovoltaic storage systems Household energy storage photovoltaic systems mainly include off-grid integrated photovoltaic energy storage systems, AC coupled photovoltaic energy storage systems, and off-grid photovoltaic energy storage systems in three categories: 01

Off-grid integrated photovoltaic energy storage system The system generally consists of components, lithium batteries, energy storage inverters, smart meters, power grids, grid-connected loads, and off-grid loads. The bidirectional DC-AC conversion is realized by the energy storage inverter for charging and discharging of the battery.

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High integration, effectively reducing system installation time and cost ➤

Intelligent control, can switch working mode according to the situation to meet the user's electricity demand ➤

When the power grid is out of power, it can provide users with safe power guarantee02

AC-coupled photovoltaic energy storage system The AC-coupled photovoltaic energy storage system is mainly composed of components, grid-connected inverters, lithium batteries, AC-coupled inverters, smart meters, power grids, grid-connected loads, and off-grid loads. The system is mainly used in the application scenario of expanding the energy storage system of the existing photovoltaic system.

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It is suitable for the existing grid-connected photovoltaic system to be expanded into an energy storage system, and the input cost is low➤

It can provide users with safe power guarantee when the grid is out of power➤

Strong compatibility, suitable for grid-connected photovoltaic systems of different manufacturers03

Off-grid photovoltaic energy storage system The off-grid photovoltaic energy storage system is mainly composed of components, energy storage batteries, off-grid inverters, loads and generators. The system is mainly used in remote areas without power grids, isolated islands, etc.

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Suitable for daily electricity demand in grid-poor areas ➤

It can form a stable complementary power supply system with the generator set network

Benefits of household optical storage system 01

To cope with the surge in electricity consumption and avoid power outages, it has become a trend for some households to install central air conditioners, lay floor heating, purchase new energy vehicles, and install charging piles, which has led to a surge in household electricity consumption. On the other hand, with the surge in social electricity consumption, power outages may occur during peak periods of power consumption. At the same time, extreme weather such as typhoons, thunderstorms, and snowstorms may also cause power outages in severe cases. The installed household storage can cope with the surge in power consumption and meet emergency electricity demand.

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Maximize photovoltaic self-generation and self-use rate Photovoltaic energy storage system can give priority to photovoltaic power to loads, and store excess power in batteries, so that when photovoltaic power generation is insufficient or at night, the battery discharges to supply energy to loads, so as to improve the self-generation and self-use rate of the photovoltaic system , to achieve energy self-sufficiency and save electricity bills. Its working logic is as follows:03

Using time-of-use electricity prices to reduce electricity bills Taking Shanghai as an example, residents’ electricity bills are subject to time-of-use electricity prices:

According to the peak and valley hours in Shanghai (peak hours 6:00~22:00, valley hours 22:00~6:00 the next day), the electricity price shows that the electricity price in the valley hours is nearly 50% cheaper than the electricity price in the peak hours. , using photovoltaic power and peak-to-valley time-shifting methods can effectively reduce electricity costs. The inverter is set to the timing charging mode: that is, 22:00-06:00 is the charging time period; 6:00-22:00 is the discharging time period, and the battery charging priority is given to the time when the photovoltaic is sufficient; the system can To control the charging and discharging time of the battery, to increase the income. The working logic is as follows:

Summarize

The photovoltaic + energy storage system has many advantages, such as improving the reliability of power supply, increasing the rate of self-generation and self-use, and optimizing electricity expenses. From a global perspective, due to factors such as energy crisis, high electricity costs, and weak power grids in various countries and regions, the development of household solar storage will become the norm. For the domestic market, with the deepening of the contradiction between photovoltaic installed capacity and consumption, the penetration rate of new energy vehicles, charging piles and other equipment, and the increase in household electricity consumption, photovoltaic storage systems will gradually become a development trend, and more households will use analysis For the composition of local electricity charges, considering the introduction of photovoltaics into energy storage and comprehensive tiered electricity prices and peak-to-valley electricity prices, electricity charges can be effectively reduced and electricity expenses can be minimized.