Key Parameter in household energy storage system
The key parameters of the Household energy storage system play a decisive role in its performance,application scenarios and use effects,Here’s a detailed introduction about it.
1.Rated capacity
Explanation:It’s the energy amount in energy storage system can be stored,unit is KWh,it decides the energy storage system can output how many energy when it’s fully charged.
Influence:This parameter is directly related to the energy storage system can meet the time of household electricity consumption,for example, if the average daily consumption of a household is 15kWh, an energy storage system with a rated capacity is more than 15kWh can be used to meet the daily electricity consumption when there is no other power supply.
2.Power
Explanation:The ability to charge and discharge in watts (W) or kilowatts (kW) per unit of time,it has charging power and discharge power, charging power refers to the speed at which energy storage system obtains electrical energy from external power sources (such as power grids and solar panel); discharge power refers to the speed at which it outputs electrical energy to a household load.
Influence:The high charging power can make the energy storage system fully charged in a short time, and the high discharge power can meet the needs of high-power electrical appliances for instant start-up and continuous operation,for example a 5kW energy storage system can not take a 8kW air conditioner.
3.Charge&discharge efficiency
Explanation:When charging, the energy storage system converts the input electrical energy into chemical energy storage efficiency; when discharging, the chemical energy efficiency is converted into electrical energy output,generally expressed as a percentage, the comprehensive charge and discharge efficiency is the multiplication of charging efficiency and the discharge efficiency.
Influence:The smaller energy loss during the charge&discharge process,for example,household energy storage system with 90% efficiency can actually output 9kWh if it is charged with 10kWh electricity,while energy storage system with 80% efficiency can only output 8kWh.
4.Cycle life 
Explanation:Refers to the number of complete charge-discharge cycles of the energy storage system under certain conditions,when the battery capacity decays to a certain proportion of the initial capacity (such as 80%), it is considered to have reached its cycle life.
Influence:The long cycle life means energy storage system don’t need to replace the battery frequently during long-term use, reducing the long-term use cost,for example, a battery with 6000 cycles lifetim when it’s charged one cycle per day, can theoretically be used for about 15 years.
5.Energy density
Explanation:Amount of energy that can be stored in unit volume or weight , measured in watt-hours per liter (Wh/L) or watt-hour per kilogram (Wh/kg)
Influence:The higher energy density has more energy to be stored in the same volume or weight, and high energy density products are more suitable for household energy storage system where space is limited or there is a weight restriction on the installation location.
6.Working Temp Range
Explanation:The ambient temperature range in the energy storage system can operate normally, safely and efficiently.
Influence:Over this range, the battery performance will be affected, such as the increasing internal resistance at low temperature, the reduction of charging and discharging efficiency, and the decrease of usable capacity; high temperatures accelerate battery aging and shorten the cycle life.
7.Conclusion
This article has introduced the key parameters for household energy storage system,we can according to these key factors to know is it bad or good for our systems when we buy it.