Photovoltaic systems paired with energy storage units are a reliable means of efficiently utilizing clean energy. In many countries and regions, photovoltaic energy storage systems have become the preferred energy method.
With the further expansion of domestic photovoltaic installed capacity, photovoltaic storage systems have also become the new normal. What are the main structures of photovoltaic + energy storage? What benefits can it bring?
Main types of household optical 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:
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. Bidirectional DC-AC conversion is achieved through the energy storage inverter for charging and discharging the battery.
AC-coupled photovoltaic energy storage system mainly consists of components, grid-connected inverter, lithium battery, AC-coupled inverter, smart meter, power grid, grid-connected load and off-grid load. This system is mainly used in application scenarios where existing photovoltaic systems are extended with energy storage systems.
Off-grid photovoltaic energy storage systems mainly consist of components, energy storage batteries, off-grid inverters, loads and generators. This system is mainly used in remote areas without power grid, isolated islands, etc.
Nowadays, it has become a trend for some households to install central air conditioning, install floor heating, purchase new energy vehicles, and install charging piles, which has caused a surge in household electricity consumption.
On the other hand, with the surge in electricity consumption in society, power outages may occur during peak periods of electricity consumption. At the same time, extreme weather such as typhoons, thunderstorms, and blizzards may also cause power outages in severe cases. Installing household storage can cope with the surge in electricity consumption and meet emergencies. Electricity demand.
The photovoltaic energy storage system can provide photovoltaic power to the load first, and the excess power is stored in the battery so that when the photovoltaic power generation is insufficient or at night, the battery discharges to supply energy to the load, thereby improving the self-consumption rate of the photovoltaic system and achieving energy self-sufficiency. , save electricity expenses. Its working logic is as follows:
Taking Shanghai as an example, residents’ electricity bills are based on time-of-use prices:
The inverter is set to the scheduled charging mode: that is, 22:00-06:00 is the charging time period; 6:00-22:00 is the discharging time period, when photovoltaics are sufficient, battery charging is prioritized; the system can be adjusted according to the peaks and valleys of the power grid. To control the charging and discharging time of the battery to increase profits. The working logic is as follows:
For the domestic market, as the contradiction between photovoltaic installed capacity and consumption deepens, the penetration rate of new energy vehicles, charging piles and other equipment increases, and household electricity consumption increases, photovoltaic storage systems will gradually become a development trend, and more families will pass the analysis For the composition of local electricity bills, the introduction of photovoltaic energy storage and the comprehensive consideration of tiered electricity prices and peak and valley electricity prices can effectively reduce electricity bills and minimize electricity expenses.