The core of household energy storage
Photovoltaic storage system for battery + energy storage inverter
Household energy storage is a necessary auxiliary of distributed energy system. According to application scenarios, energy storage can be divided into user side (spontaneous self-use and peak-valley spread arbitrage), power generation side (grid-connected renewable energy and reduction of light and wind abandonment), power grid side (power peak regulation and frequency modulation), transmission and distribution side, and auxiliary services (5G base station standby power supply).
Classification of household energy storage products
- 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 household split machine battery 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 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’s batteries can be used with common energy storage inverters on the market to form a “photovoltaic + energy storage” system.
Technical route: lithium iron phosphate battery is the mainstream
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. OSM battery has obtained the EU CE certification, and the safety of the battery is guaranteed. Currently, their products are sold worldwide. In addition, some companies such as CATL and PYLONTECH are already conducting research and development and testing of sodium ion and lithium iron manganese batteries. We expect that the technical route of energy storage batteries is expected to be further improved in the future.
Rapid growth in demand, ushering in an accelerated period of energy storage
The demand for household energy storage is growing rapidly, with a year-on-year increase of 56% in 2021. According to BNEF data, the global installed capacity of energy storage in 2021 is about 10GW/22GWh, a year-on-year increase of 84%/105%, of which distributed energy storage capacity is about 2.5GW/5.6GWh, a year-on-year increase of 45%/40%. The installed capacity of household storage is about 1.9GW/4.4GWh, a year-on-year increase of about 53%/56%. The global household savings are booming, and the main driving factors come from two aspects: one is the continuous increase of policy support, and the other is the economic drive of high returns.