What's the key point of off-grid home energy storage system?

The key point of household off-grid energy storage system is energy storage. Which mainly solve that household power problem of household user. At present, most of the energy storage batteries in household off-grid energy storage systems use lithium iron phosphate batteries, and a few use lead-acid batteries.

 

Different from the household grid-connected energy storage system, the household off-grid energy storage system does not need to access the internet, generates electricity independently, and uses electricity independently, thus truly realizing the freedom of electricity use.

Household off-grid energy storage system consists of photovoltaic+energy storage system, which generally consists of photovoltaic module, lithium battery, off-grid energy storage inverter, load and diesel generator (alternative scheme). The system can directly charge the battery through DC-DC conversion, and can also realize bidirectional DC-AC conversion for charging and discharging the battery.

 

The working principle of household off-grid energy storage system is that photovoltaic panels are used as power generation components, and the controller regulates and controls the generated electric energy. On the one hand, it sends the adjusted energy to DC load or AC load, and on the other hand, it sends the excess energy to the storage battery for storage. When the generated electricity cannot meet the needs of the load, the controller sends the electric energy of the storage battery to the load. After the battery is fully charged, the controller should control the battery not to be overcharged. When the electric energy stored in the battery is discharged, the controller should control the battery not to be overdischarged to protect the battery. When the performance of the controller is not good, it will greatly affect the service life of the battery and ultimately affect the reliability of the system.

 

The household off-grid energy storage system is characterized by solving the daily electricity demand of household users in areas without power grid or areas with abnormal public power supply, and can be combined with diesel generators to supply loads or charge batteries. Most off-grid energy storage inverters of household off-grid energy storage systems have no grid-connected certification, so even if the system has a grid, it cannot be connected to the grid.

 

Household off-grid energy storage system is similar to a miniature energy storage power station, and its operation is not affected by public power. In the off-grid energy storage system, the battery pack will be self-charged during the off-grid time, so as to be used in case of power peak and power failure. In addition to being used as an emergency power supply, the household off-grid energy storage system can also balance the power load, thus saving household electricity expenses.

 

A key component of the household off-grid energy storage system is the solar controller (MPPT controller), and the terminal of the MTTP controller is at the back. Just connect the photovoltaic panels in series and in parallel in sequence on the terminal behind the controller. If the system configuration is relatively small, such as a small system below 3 kW, this solar controller can be combined into an all-in-one machine.

 

The application scenarios of household off-grid energy storage system are still relatively extensive, on a global scale. Remote areas in North America, Africa, Southeast Asia and Chinese mainland, such as pastoral areas in Tibet, Xinjiang, Gansu and Inner Mongolia.

Because of the modular design, it is convenient to expand and install, many application places of household off-grid energy storage systems are in places where large power grids cannot reach or where power supply is unstable.

 

1. It is used in houses at the top of the mountain. Because the large power grid at the top of the mountain is difficult to pass, users can use the off-grid energy storage system to supply power.

2. Users can use the off-grid energy storage system to supply power in places where large power grids can't reach, such as fish ponds, orchards or frontier posts in the wild. Can meet people's daily power supply needs.

3. In the summer in rural areas, you can also prepare a set for use when power is often cut off, and some electricity needs such as air conditioning in the house can be met.

 

Household off-grid energy storage system can be connected to photovoltaic power generation, wind power generation and diesel engine. Regarding the design scheme and electrical scheme of household off-grid energy storage system, the selection and calculation of components, inverter (controller) and battery are mainly considered. Before the design, the preliminary work should be done well, because the off-grid systems are all customized, and there is no unified plan. It is necessary to know the user's load type and power, the electricity consumption during the day and at night, and the climate conditions of the installation site.

 

Design the power generation according to the customer's electricity consumption, design the size of photovoltaic modules according to the sunshine situation in the use area, design the corresponding battery size according to the specific electricity consumption and the need for standby electricity consumption, and design the inverter size according to the type of electrical equipment and the maximum power.

 

We need to combine the actual situation of users, and the final product selection and system design scheme will be different with different usage conditions.

In order to let everyone better understand the household off-grid energy storage system intuitively, let me give an example:

Configuration of a 5Kw/20Kwh Household Off-grid Energy Storage System

 

1. The energy storage system is equipped with 20 kWh.

2. The photovoltaic module is equipped with 10 450-watt boards.

3. The inverter is equipped with a 5 kW inverse control integrated machine.

 

I calculate the illumination time according to 5 hours a day. The daily power generation of the whole system is about 20Kwh, the storage capacity of the lithium battery energy storage system is 20 kWh, and the effective discharge capacity is 18 kWh. The maximum load of this system should not exceed 4KW (including the maximum load starting power).

 

SVC Energy Off-grid Solar Inverter VMH Series are precision engineered to provide maximum performance, efficiency, reliability and longevity. VMH is the high-frequency off-grid inverter, built-in advance MPPT charge controller and intelligent battery management. It is an all-in-one solar inverter combining the functions of solar charger, battery charger and off-grid inverter into one units. This single-phase inverter has low start-up voltage and wide voltage range for longer generation windows. Ideal PV inverter used to provide backup for home and office.