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What is home energy storage?

Home energy storage systems are becoming more and more popular as they can provide green power to the home day and night and continuously, save money on electricity bills while safeguarding the quality of life of the family through solar power generation.

During the daytime, home PV storage systems absorb solar power and automatically store it for use by the load at night. In the event of an unplanned power outage, the system can also automatically switch to a backup power source for the family in a timely manner to ensure the normal operation of lighting, electrical appliances, and other equipment systems at all times. In low times of power consumption, the battery pack in the home energy storage system can be charged by itself to prepare for the peak of power consumption or power outage, in addition to being used as an emergency power supply, the home energy storage system can also equalize the power load, thus saving the family’s power expenses. A smart home PV storage system is similar to a miniature energy storage plant, and its operation is not affected by the pressure of urban power supply.

What is a home PV energy storage system?

A home photovoltaic energy storage system is a system that combines a solar photovoltaic conversion system with an energy storage device that converts solar power into stable electricity. This type of system allows homeowners to generate electricity during the day and store the excess for use at night or in low-light conditions.

What are the types of home PV energy storage systems?

There are currently two types of home energy storage systems, one for grid-connected home energy storage systems and one for off-grid home energy storage systems.

Grid-connected home energy storage system:

Contains five main parts: solar array, grid-tied inverter, BMS management system, battery bank, and AC load. The system adopts a hybrid power supply of PV and an energy storage system. When the utility power is normal, the load is powered by the PV grid-connected system and the utility power; when the utility power is cut off, the load is powered by the joint power supply of the energy storage system and the PV grid-connected system. The grid-connected home energy storage system is divided into three working modes, Mode 1: PV provides energy storage, and the residual electricity is fed into the Internet; Mode 2: PV provides energy storage, and part of the users use electricity; Mode 3: PV only provides part of the energy storage.

Off-grid home energy storage system:

It is independent and does not have any electrical connection to the grid, so the whole system does not need a grid-connected inverter, and the PV inverter can meet the requirements. Off-grid home energy storage system is divided into three working modes, mode 1: PV provides energy storage and user electricity (sunny days); mode 2: PV and storage battery provide user electricity (cloudy days); mode 3: storage battery provides user electricity (evening and rainy days).

Whether it is a grid-connected home energy storage system or an off-grid home energy storage system, it cannot be separated from the inverter, which is like the brain and heart of the system.

What is an inverter?

An inverter is a typical component in power electronics, capable of converting DC power (batteries, storage batteries) into AC power (generally 220v50HZ sine or square wave). In layman’s terms, the inverter is a device that converts direct current (DC) into alternating current (AC). It consists of an inverter bridge, control logic, and a filter circuit. Common components are rectifier diodes and thyristors. Almost all household appliances and computers have rectifiers installed in the power supply of the appliance, DC to AC, called inverters.

Why do inverters hold such an important place?

AC transmission is more efficient than DC transmission and is widely used for transmission of electricity. The power dissipated by the transmitted current in the wire can be obtained by P=I2R (power = current squared x resistance), and it is obvious that to reduce energy loss, the transmitted current or the resistance of the wire needs to be reduced. Due to cost and technical limitations, it is difficult to reduce the resistance of the transmission lines used (such as copper wire), so reducing the transmission current is the only effective method. According to P=IU (power=current×voltage, in fact, effective power P=IUcosφ), the current in the wires can be lowered by converting direct current to alternating current and increasing the voltage of the grid to save energy.

Similarly, in solar photovoltaic power generation, the power generated by the photovoltaic arrays is DC energy, however, many loads require AC energy. The DC power supply system has great limitations, it is not easy to change the voltage, and the range of load applications is limited, except for special power loads, all need to use inverters to convert DC power to AC power. The photovoltaic inverter is the heart of the solar photovoltaic power generation system, which will be the photovoltaic module generated by the DC power into AC power, delivered to the local load or the power grid, and has the relevant protection function of the power electronic equipment. PV inverters are mainly composed of power modules, control circuit boards, circuit breakers, filters, reactors, transformers, contactors cabinets, etc. The production process includes the pre-processing of electronic parts, assembly, testing, and packaging of the whole machine, and its development depends on the development of power electronics, semiconductor device technology, and modern control technology.

The inverters developed by Firsola, combined with the safe isolation of the circuits of the photovoltaic system units, meet the needs of users of energy storage devices.

5500W 48V 1 600x600 1

Firsola GD series inverter, 5000W is suitable for home use in most regions and countries, capacitive core PCB with solid materials, and is equipped with a Wi-Fi monitoring function, so you can check the work situation through your cell phone anytime and anywhere. In addition, Firsola GD series inverters can also be used in parallel, up to 4 machines can be used simultaneously, up to 20,000W power, very suitable for families with large power demands.

FSA IVT HES4860 FSA SPW 05

The 10KWH wall-mounted battery has a simple exterior design, the shell has an anti-static layer to protect your safety, and the internal battery pack is connected in series according to scientific design, leaving enough space for heat dissipation.

The back is mounted with a simple bracket, which is easy and secure, and can be used more than once and increase the power storage.

Battery with battery management BMS system, the default setting depth charge and discharge 80% DOD, with lithium iron phosphate battery cells can reach a maximum cycle of 5000 times, the product warranty of 7 years, after 7 years of waste batteries can be replaced with new battery replacement and purchase of new policy.

Contact us if you need to.

Firsola, your home energy storage solution expert!

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