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How to choose TSUN storage inverter for high voltage battery

As a kind of clean energy, solar energy has been widely popularized in the world. With the increasing of the world's photovoltaic installations and the change of relevant policies, more and more users expect to make greater use of the electricity generated by solar energy systems. Photovoltaic energy storage system is thus produced. TSUN has introduced a photovoltaic energy storage inverter suitable for single-phase power grid. According to the development direction of batteries in the current energy storage system, this series of inverters is matched with high-voltage LiFePO4, compared with standard 48V batteries, it has higher conversion efficiency and improves the utilization rate of electric energy.

TSUN high voltage energy storage inverters include Hybrid inverter and AC Coupled inverters, each with a total of 6 power levels of 3kW to 6KW.As can be seen from the nomenclature, the first letter represents its type, where H stands for Hybrid and A for AC Coupled. The middle number represents the power level. The last letter H stands for efficient energy storage inverter. For these 12 products, how to choose a suitable inverter?

Choose the inverter type according to the project type

TSUN high voltage energy storage inverters include Hybrid inverter and AC Coupled inverters, which are designed for different user requirements. The difference between the two is that Hybrid inverter has a photovoltaic DC input module, while AC Coupled does not.

Hybrid inverter is suitable for users who have not installed PV systems or need to expand their PV systems. The Hybrid inverter, as the name implies, is a Hybrid scheme that includes all the features of AC Coupled. Hybrid inverter can store excess energy while utilizing solar power for home use when needed, maximizing the utilization of the photovoltaic power generation system.

AC Coupled inverter is suitable for users with installed photovoltaic or other new energy power generation systems. Due to the timeliness of photovoltaic energy, if it cannot be consumed by household load, it will feed in to the city grid or be wasted. AC Coupled Inverter, as the name suggests, is an AC-coupled power-storage retrofitting scheme for AC side power grids. As the AC power grid is standard, the scheme of storing and reusing the AC side energy has strong universality. With no restrictions on the type of power generation system available, AC Coupled allows users to store any excess power on the AC grid, Therefore, it improves the utilization rate of electricity energy of users.

How to select Hybrid inverter power level

Hybrid Inverter is divided into 6 classes in terms of power level, including 3.0K, 3.6K, 4.0K, 4.6K, 5.0K, and 6.0K.Among them, the output power of 3.6K model is 3680W, which is used to meet the requirements of 230Vac/16A output power in some areas.4.6K model output power 4600W, used to meet the German region maximum 4600W grid output requirements.3.0K, 4.0K, 5.0K and 6.0K are standard integral power output models, the output power is the same as the model description.

During the selection of Hybrid inverter, it is necessary to pay attention to three parts: DC input power, AC output power and EPS output power. EPS output refers to the important load emergency output. In other words, for the important load in the user's home, it is hoped that it can still operate normally in the case of power failure of the city grid, and it can be connected to EPS output port. EPS port will provide off-grid power output in case of power failure of the city grid. According to the different purposes of the customer, you can refer to these three parameters for selection.

When the user expects to install the photovoltaic power station as far as possible according to the roof area, the power to be installed can be calculated based on the DC input power and the roof area and the selected photovoltaic module model. Hybrid's DC side maximum input power is between 1.2 and 1.66 times the rated output power. According to the calculated pv module power of the roof, select Hybrid inverter with appropriate power. For example, user A has not installed photovoltaic energy storage system in his home. After investigation, photovoltaic modules can be installed on two sides of the current roof, among which 10 of 310W modules can be installed on the south side and 8 of 310W modules on the east side. So, users can choose to install the 4kW Hybrid inverter or the 5kW Hybrid inverter.

The maximum input power on the dc side of the Hybrid inverter is between 1.2 and 1.66 times the rated output power.According to the calculated rooftop photovoltaic module power, select the Hybrid inverter with appropriate power.For example, user A has not installed photovoltaic energy storage system in his home.After investigation, photovoltaic modules can be installed on two sides of the current roof, including 10x310W modules on the south and 8x 310W modules on the east.At this point the user can choose to install a 4kW Hybrid inverter or a 5kW Hybrid inverter.

When frequent power outages occur in the area where the user is located, the power supply of important loads must be ensured, that is, when the back up mode is adopted, the operating power of important loads can be counted according to the EPS output power, so as to select the Hybrid inverter with appropriate power. For example, the area where customer C is located has frequent power outages and wants to be able to supply some important electrical power. After investigation, the user's family has 1 refrigerator (400W in total), 2 air conditioners (3500W in total) and 4 lamps (200W in total). So, the total customer demand is 4100W per month. Considering that the air conditioner is a sensitive load, the Hybrid inverter of 5kW can be selected.

How to select AC Coupled inverter power level

The AC Coupled inverter also includes six power levels, including 3.0k, 3.6k, 4.0k, 4.6k, 5.0k, and 6.0k. The output power of model 3.6k is 3680W, which is used to meet the output power requirements of 230Vac/16A in some regions. The output power of model 4.6k is 4600W, which is used to meet the requirements of the largest grid-connected output of 4600W in Germany.3.0k, 4.0k, 5.0k, and 6.0k are standard integral power output models. The output power is the same as the model description.

During the selection of AC Coupled inverter, it is necessary to pay attention to the AC output power and EPS output power. According to the different purpose of the customer, you can refer to these two parameters for selection.

Depending on the power level of the current installed power generation system, an AC Coupled inverter can be selected to ensure that all unused power is stored when users wish to use electricity obtained from the daytime power generation system at night, in a self-use mode. Additionally, depending on the power of your home appliances, a more powerful AC Coupled inverter can be selected to ensure that all electrical power used by your home appliances comes from power stored during the day.

When frequent power outages occur in the user's area, it is necessary to ensure power supply for critical loads, that is, when backup power mode is adopted, AC Coupled inverter with appropriate power can be selected by calculating the operating power of critical loads according to EPS output power.

How to select battery capacity

TSUN high voltage energy storage inverter adopts high voltage energy storage battery. The battery module adopts parallel mode to increase the battery voltage and reduce the output current, so as to achieve the purpose of improving efficiency. As the number of battery modules increases, so does the capacity of the battery. In particular, the output of the inverter is also limited by batteries. The battery side current limit of TSUN high voltage energy storage inverter is 20A, and different battery output modes will be obtained according to the number of battery modules. The AC output of the system shall not exceed the output power of the battery or the inverter.

The user can judge how to choose the battery capacity from several aspects: 1. Without any reference, the user can choose the battery capacity according to 1.5 to 2 times of the inverter power; 2. In the self-use mode, the capacity of the battery can be selected according to the generating capacity of the rooftop photovoltaic power station and the daily electricity consumption;3. In EPS mode, battery capacity can be selected according to important load power and expected outage duration. Take EPS mode as an example, the location of user D may be without power for 5 hours. During these 5 hours, you need to use the oven for 1 hour (1500W), the heater for 5 hours (1500W), the refrigerator for 5 hours (700W), and 4 lights for 5 hours (200W).At this point, the electricity consumption is 1500*1+1500*5+700*5+200*5=13500Wh= 13.5kwh. Take the Pylontech X1 series high voltage battery as an example. A single battery is 2.4kwh, and 6 batteries need to be configured, with a total battery capacity of 14.4kwh.