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Views: 19 Author: Site Editor Publish Time: 2025-07-28 Origin: Site
Lithium batteries have emerged as the leading solution for household energy storage projects, driven by advancements in battery technology and a significant drop in costs. These batteries offer a range of benefits, including high efficiency, long cycle life, and consistent performance, making them a preferred choice for energy storage applications.
only according to the load power and electricity consumption selection of battery capacity.
Battery capacity design, the load is the most important reference factor. But the battery charging and discharging capacity, the maximum power of the energy storage machine, the load of power hours should not be ignored.
Usually, the battery manual is labeled above the theoretical capacity of the battery, that is, in the ideal state, the battery from SOC100% to SOC0% when the battery can release the maximum amount of power.
In the actual application, taking into account the life of the battery, generally do not allow discharge to SOC0%, will be set to protect the power.
Consider the battery utilization rate when using. If the capacity of the PV system is small, or the load power consumption is small, the battery can not be filled that is a waste.
Due to process loss, the battery discharge is less than the battery storage capacity, and the load power consumption is less than the battery discharge. Neglecting the efficiency loss is likely to cause the phenomenon of insufficient battery power supply.
It mainly introduces the idea of battery capacity design under three common application scenarios: self-generation and self-consumption (high electricity cost or no subsidy), peak and valley tariffs, and standby power (unstable grid or important load).
The installation of PV energy storage systems is a strategic initiative aimed at reducing electricity expenses, particularly in contexts where electricity prices are high or subsidies for grid-connected PV are limited.
Assuming grid stability, off-grid operation is not considered, PV is only to reduce grid electricity consumption, and there is generally more light during the day.
Ideally, the PV+storage system would be capable of meeting the household's electricity needs in full. However, this situation is challenging to implement. After evaluating the input cost and electricity consumption, we can determine the optimal battery capacity based on the average daily electricity consumption (kWh) of the household. Please note that the default PV system has sufficient energy.
The structure of peak and valley tariffs is approximately 17:00-22:00, as this period accounts for the majority of electricity consumption.
During standard daytime hours, the electricity consumption is minimal. This allows the PV system to be effectively covered. However, during peak periods, it is essential to ensure that at least half of the electricity supplied by the battery is used to reduce overall electricity expenditure.
According to the latest data, the average daily electricity consumption during the peak period is 20kWh.
3. 3 Please be advised that standby power is required in areas where the electrical grid is unstable.
This is primarily employed in areas with unstable power grids or in situations involving significant loads.
For instance, the application site is likely to require 5-8 kW of components.
Please note that this is an important load. This product is equipped with a 4-inch ventilation fan that boasts a power output equivalent to that of a single 550-watt fan.
The current grid situation is marked by instability and frequent power outages, with durations reaching up to three to four hours.
The application requirements are as follows: under normal grid conditions, the battery is prioritized for charging; during grid outages, the battery + PV ensures the normal operation of important loads (fans).
When selecting the battery capacity, it is essential to consider the amount of power required to supply the battery alone in an off-grid scenario, assuming an evening blackout with no PV.
The first item is the photovoltaic system capacity.
Assuming that the battery is fully charged by PV, the maximum power output of the storage machine for charging the battery is 5,000 watts. Furthermore, the number of sunshine hours per day is 4.
The effective capacity of the 800Ah battery in an ideal state of full charge is equivalent to the average need. When utilized as a backup power source, this battery operates in accordance with the following mode:
The total capacity of the battery is 800 ampere-hours (Ah), with a maximum discharge rate of 100 amperes (A) and a maximum operating time of 4 hours. This translates to a total operating time of approximately two days.
2) Battery redundancy design
Due to the presence of factors such as photovoltaic power generation instability, line loss, ineffective discharge, battery aging, and other efficiency losses, it is essential to maintain a certain margin when designing battery capacity.
This article indicates that the three scenarios are similar in design, with fixed core conditions and different factors in each scenario.
Thlinkpower batteries and Thlinkpower self-developed energy storage inverters are perfectly combined to provide comprehensive energy storage solutions for industrial and commercial scenarios. These solutions meet the needs of industrial and commercial users for energy time-shifting, peak shaving, peak-filling, demand control, load tracking, emergency power backup, and other functions.
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