The above is a HJ-ESS-215A(100KW/215kWh)HJ-ESS-115A(50KW/115kWh) two models of energy storage cabinet produced by Huijue Group, we will carefully analyze his parameter table, through the parameter table can see the configuration of energy storage cabinet, so that you can choose and purchase energy storage cabinet, You know what you're doing.
The rated power on the AC side shown in Figure 2 is the rated active power that can be continuously and stably output on the AC side, which determines the scale of electric energy exchange between the energy storage system and the power grid. The energy storage system can absorb electric energy from the power grid with this rated power. At peak times, this power can be released to the grid. The maximum output power on the AC side is its maximum output capacity, and the maximum output capacity of this device is 110kw.
So what's the difference? The rated power of the AC side is the stable output capacity of the equipment, usually the actual output power of the AC side, its value will change with the operating status of the equipment, the load situation and the external environment and other factors, usually less than the rated power, more than the rated power will lead to equipment damage, therefore, the selection should be based on the power of the load to choose the appropriate power of the energy storage cabinet. Huijue Group the maximum output capacity of this equipment is larger than the rated output capacity, in order to prevent the equipment from deteriorating due to power damage and reduce the risk of equipment damage.
So what's the difference between the AC side and the DC side? The DC side is usually the side of the photovoltaic module that generates direct current, and its power is related to the rated power of the AC side. Due to the loss of the inverter in the process of converting direct current to alternating current, the total power of the DC side component is usually greater than the rated power of the AC side.
As shown in Figure 3, the battery capacity of the device is 280Ah. Ah is a unit of electricity. 1 amp hour is equal to the amount of electricity transmitted by 1 amp current flowing continuously for 1 hour. The capacity of a single battery in the figure is 280ah and discharged at 0.5C discharge rate. Then, discharge current I=0.5x280A=140A, rated power P=3.2Vx140A=448W, this value is the power of a single battery in the ideal state, the actual power output of the battery may be affected by the battery internal resistance, temperature and other factors.
Battery pack configuration optimization: When designing battery packs for storage cabinets, understanding the capacity of individual batteries helps determine the number of batteries and how to connect them. For example, if the total energy storage demand of the storage cabinet is certain, the number of batteries that need to be connected in series and parallel can be calculated by the capacity of a single battery. Through reasonable arrangement of series and parallel combination, the requirements of energy storage cabinet in voltage and capacity can be met.
The Depth of Discharge (DOD) refers to the percentage of the total capacity of the battery consumed when the battery is discharged from a full charge state to a specific charge state during use.
For example, a battery with a capacity of 280Ah consumes 266Ah of electricity after one use, then its discharge depth is DOD = 266Ah/280Ah*100% = 95%. This indicator is an important parameter to measure the degree of battery use, the higher the depth of discharge, the life of the battery is usually shortened, in order to extend the battery life, most batteries are recommended to maintain the discharge depth below 80%, deep cycle batteries can withstand higher DoD.
