What is household energy storage
Household energy storage is a necessary aid for distributed energy systems. According to the application scenarios, energy storage can be divided into user side (self-generated and self-consumption, peak-valley price difference arbitrage), power generation side (renewable energy grid connection, reduction of solar energy and wind), grid side (power peak regulation, frequency regulation), transmission and distribution side and Ancillary services (5G base station backup power), etc.
Core Components
The core of the household solar storage system is photovoltaic + battery + energy storage inverter. Household energy storage and household photovoltaics are combined to form a household optical storage system. The optical storage system mainly includes cells, energy storage inverters (bidirectional converters), and component systems.
A typical system is generally 5KW (component + inverter) with 10 kWh (energy storage battery) or 10kW + 10 kWh, in which the battery is the core of the energy storage system, accounting for about 45-50% of the cost; the energy storage converter can control charging and discharging and converting between AC and DC accounts for about 10-15% of the cost; the component system, that is, the photovoltaic system used for solar power generation, accounts for about 20-25% of the cost; the installation cost will increase from 10,000 to 20,000 in 2021 About 15-20%. Most households use 48V energy storage systems, which have 100Ah, 200Ah, and 300Ah to store electricity.
Household energy storage products are divided into integrated machines and split machines
All-in-one machine:
The home-type photovoltaic energy storage and inverter integrated machine is an integrated system with photovoltaic inverter, battery and controller placed inside. Easy to use. Generally, there are three working modes: solar energy priority mode, AC (mains) priority mode, and SE priority mode (off-peak power consumption mode).
Split type (inverter + battery system):
The battery of the household split machine is installed separately from the inverter. Users can match the household energy storage inverter according to their own needs, and can also match the switching power supply or the inverter as a backup power supply. Generally, there are four types of hybrid home photovoltaic + energy storage systems, coupled home photovoltaic + energy storage systems, off-grid home photovoltaic + energy storage systems, and photovoltaic energy storage energy management systems. OSM battery has obtained the EU CE certification, and the safety of the battery is guaranteed. Currently, their products are sold worldwide.
Mainstream technologies for household energy storage
The mainstream technology route of household energy storage is lithium iron phosphate, and sodium ion and lithium iron manganese are new paths in the future. The technical route of energy storage battery includes lithium-ion, lead battery, flow battery, etc. At present, lithium iron phosphate battery is more in line with the design requirements of energy storage battery than ternary lithium battery due to its high safety and long cycle life, is the mainstream development route of energy storage batteries, and Tesla energy storage batteries have gradually shifted from the ternary route to the iron-lithium route. It is expected that the technical route of energy storage batteries is expected to be further improved in the future. The energy storage battery OSM battery company currently provides 5KWH, 10KWH, wall-mounted and stacked styles of energy walls. Such products are very suitable for the needs of household energy storage.
48v 100Ah 5 kWh battery energy storage
The source power of overseas household energy storage economy
High electricity prices and cost reduction of optical storage systems are important sources of economical energy storage for overseas households
- At present, household energy storage is mainly concentrated in countries or regions with high electricity prices. According to IHS Markit data, in 2020, the total proportion of household energy storage in Germany, the United States, Japan and Australia will reach 74.8%.
- The main function of household energy storage is to realize the self-use of household photovoltaic power generation during the day and night. The main profit comes from the difference between the residential electricity price at night and the household photovoltaic on-grid electricity price during the day. High electricity prices and cost reduction of solar energy storage systems are important prerequisites for realizing the economy of household energy storage.
- For countries and regions such as South Africa, due to the relatively weak local power grid facilities or the threat of natural disasters from time to time, relatively wealthy families have an urgent demand for configuring household energy storage to improve the reliability of power supply.