About Acoucou Emergency Battery Backup System, what you need to know a

In recent years, the homes we live in had more and more natural disasters and energy shortage problems appear, many people have begun to consider the use of renewable energy to reduce expenses, and many customers have feedback that many people began to buy solar panels and battery storage systems for their houses. However, some of them do not know what you need to know to configure the UPS backup system for your house, so today tell you something we should know：


1.The above diagram is a typical household energy storage battery system, which mainly consists of solar panels, power grids, inverters, batteries, and power equipment, where the input side is only solar panels, called an off-grid system, solar panels, and the municipal network at the same time input, called mixed network system, if only the utility input, generally as a backup power system.

2. Analysis of user requirements

2.1 First of all, we need to understand the types of electrical equipment in the household and the power of the equipment.

First, make a list of the household's electricity-using equipment, fill in the maximum power, and then calculate the total power P0.

P0=P1+P2+P3+.... +Pn

2.2 Find out the number of devices that can be used at the same time and calculate the total power value P1. The purpose of this step is to prepare the subsequent configuration of the inverter in a more rational way.

3. Inverter selection

3.1 Power selection

According to the results of our electricity demand analysis, choose an inverter with a rated power higher than the P0 value, or if the customer's budget is insufficient, reduce the requirement and choose an inverter with a rated power > P1. The maximum output power of the inverter determines the maximum power of the equipment that the user can use at the same time, so this choice is very critical. If the configuration is small, in actual use, there will be an overload situation, which will lightly lead to overload protection, or heavily burn the inverter.

3.2 Type selection

There are high-frequency inverters and industrial-frequency inverters, and they have the following differences:

(1), in terms of reliability, the industrial-frequency machine is better than the high-frequency machine. The industrial frequency machine adopts a thyristor (SCR) rectifier, the technology is very mature after more than half a century of development and innovation, and its resistance to current shock is very strong, as SCR is a semi-controlled device, there will be no fault such as straight-through and mis-touch. High-frequency machines use IGBT high-frequency rectifiers, although the switching frequency is higher, IGBT works with strict voltage and current working area, and the impact resistance is lower, so the reliability is lower than SCR.

(2), in terms of environmental adaptability, a high-frequency machine is better than a frequency machine, high-frequency machine is a microprocessor as a processing control center, the complex hardware analog circuit burned in the microprocessor, the way the software program controls the UPS operation, therefore, the volume, weight and other aspects of a significant reduction in noise is also small, the space, the environment is small, therefore, for the reliability requirements are not too high for small and medium power occasions Commonly used with high-frequency machines, such as portable power supplies.

(3), in the load on the zero-ground voltage requirements, frequency machines are better than high-frequency machines, high-power three-phase high-frequency machine zero line will be introduced into the rectifier, and as the neutral point of the positive and negative bus, this structure inevitably causes the rectifier and inverter high-frequency coupling in the zero line, lifting the zero-ground voltage, resulting in the load side of the zero voltage is raised, it is difficult to meet the IBM, HP, and other server manufacturers on the zero-ground voltage less than 1V demand. In addition, when switching between the mains and the generator, the HF machine often has to turn to bypass work due to the lack of zero line, which may cause a major fault of load flash-off under certain working conditions. Industrial frequency machines do not require the rectifier to be involved in the work and the UPS can maintain normal power supply when the zero line is disconnected.

Therefore, in the specific application of domestic energy storage battery systems, the inverter also needs to be optimally configured according to the customer's specific application scenario and needs.

3.3 Voltage selection

There are two types of inverters: low-voltage and high-voltage systems. Low-voltage generally refers to systems with input voltages below 48V, while high-voltage refers to input voltages of 96V and above. Generally, single high-power output inverters are high-voltage systems, such as single 10KW or above power. If there is a demand for high power output, but the selected system is low voltage, it is necessary to use parallel mode to provide sufficient power.

3.4 Brand selection

There are many inverter manufacturers. The big brands in the off-grid field are SunPower, Huawei, etc. In the field of home energy storage batteries, there are Guravat, Shouhang, Goodway, Deye, Shangke, etc. There are several principles in the selection as follows:

(1), choose a brand that has a certain degree of popularity in the industry.

(2), they know better and have a good reputation in the industry.

(3), and home energy storage batteries can be well matched.

4. Home energy storage battery energy configuration

4.1 Battery system

Lithium iron phosphate batteries are mainly used in home energy storage battery systems and industrial energy storage fields. Lithium iron phosphate battery as Acoucou's first generation grade A cell. Using the industry's most stable BMS, while providing 6000+ deep cycle times, the portable and lightweight design is easy to apply to most scenarios, whether RV, marine, or DIY solar system.

lithium iron phosphate: can be combined in series and parallel to form the required voltage and capacity, the current 12V24V/48V as the main, needs BMS strict management. The advantage is safety and long life, the disadvantage is that compared with the ternary, the volume, and weight is large.

4.2 Home energy storage battery voltage matching

Home energy storage battery voltage is mainly determined by the inverter and needs to match the input voltage of the inverter, as 48V inverter with 48V battery, and 96V inverter with 96V battery, can not be mismatched.

4.3 Home energy storage battery energy configuration

This is decided by the user's budget, depending on how long the user wants to use the battery at full power, for example, the total power of the user's equipment is P, the time needed for full power use is h, the conversion efficiency of the inverter is β, then the energy of the battery Q=P*h/β.

4.4 Output power

Generally is determined by the design of the household energy storage battery system, subject to the discharge rate of the cell, the system structure can withstand the maximum current, BMS maximum current, heat dissipation performance, etc., such as a 48V system, the design of the maximum output current is 100A, then its output power is 4800W, etc.

4.5 Functional requirements

This refers to some additional functions in addition to the electrical performance, such as display function, mobile phone APP monitoring function, remote control function, etc. These are optional according to user requirements.

5. PV module configuration

5.1 Maximum permissible installation power

This value is determined by the area of open space that the user can use to install solar panels, generally, the roof, which limits the maximum total power allowed to install solar panels. If the available area is S squared, the area of each solar panel is S1, and the power is Pw then the maximum solar panel power that can be installed is P = S/SI*Pw.

5.2 Actual solar panel power

This value is determined by the user at the beginning of the system design. if the user needs to fill the battery for a time T and assuming that the effective local light time is t, then the solar panel power P = battery energy/T/t = Q/T/t. P should be less than or equal to the maximum allowable installed power Pw. this value is influenced by the budget, if the budget is sufficient, then P = Pw

6. Other accessories

6.1 Mounting brackets

Mainly refers to the solar panel mounting bracket, this is determined by the number of solar panels and the installation method.

6.2 Wires

Various coupling wire ranges were determined at the time of system design.

Maybe next time we'll add more details for each step, so let us know if you're interested!

Acoucou Batteries Team