With the rise of global energy prices and the enhancement of environmental awareness, more and more families are beginning to pay attention to solar power generation systems, hoping to reduce electricity bills and achieve green and low-carbon life by installing photovoltaic equipment. However, many users face a core question when planning a home photovoltaic project: How big a solar system do I need for my home?

As a manufacturer focusing on the research and development and application of energy storage technology, GreenMore provides complete home energy storage solutions for users around the world. This article will analyze in detail from a professional perspective how to scientifically configure a suitable solar energy system based on your household electricity needs.

1. Determine the average daily household electricity consumption

To calculate the size of the solar system you need, you first need to know your home's actual daily electricity consumption. You can find this out by:

• Method 1: Check your electricity bill

Most power companies will show your monthly electricity usage (kWh) on your bill. Divide it by 30 to estimate your average daily electricity usage.

Example: If your monthly electricity usage is 300 kWh, your average daily electricity usage is about 10 kWh.

• Method 2: Manually calculate the power consumption of major electrical appliances

List the power (W) and daily operating time (h) of commonly used electrical appliances in your home, and estimate using the formula Power × Time = Power Consumption (Wh).

The capacity of the energy storage battery is configured according to the number of days set

The energy storage system needs to be configured with redundant capacity according to local climate conditions. Taking Beijing as an example, the average number of consecutive rainy days per year is 2.3 days. It is recommended that the energy storage capacity be calculated according to the following formula:

Energy storage capacity (kWh) = battery charge and discharge efficiency × discharge depth average daily power consumption (kWh) × self-sufficient days (days)

For example, if a household with an average daily electricity consumption of 30 kWh requires self-sufficiency for three days and uses a lithium-ion battery with a charge and discharge efficiency of 90% and a discharge depth of 80%, it needs to be equipped with: 0.9×0.830×3=125kWh

2.Calculate the required solar system capacity

Once the average daily electricity consumption is determined, the required solar system installed capacity (kW) can be further calculated.

• Calculation formula:

Required system capacity (kW) = average daily electricity consumption (kWh) ÷ daily exposure hours (h)

Note: Peak Sun Hours refers to the standard sunshine time when the sunlight intensity reaches 1000W/m², which varies slightly in different regions. For example, in southern China, the average sunshine hours are about 4 hours/day.

Example:

If the average daily electricity consumption is 10 kWh and the average sunshine time is 4 hours, then:

Required system capacity = 10 kWh ÷ 4 h = 2.5 kW

This means that to meet your electricity needs for a day, you will need to install at least a 2.5 kW solar system.

3. Consider the supporting needs of the energy storage system

Although solar energy systems can generate electricity during the day, household electricity consumption is often concentrated in the evening and at night. Therefore, in order to achieve true "self-generation and self-use", we recommend using an energy storage battery system.

Energy storage battery capacity selection recommendations:

1. If the system capacity is 3 kW, a 5–10 kWh energy storage battery is recommended;
2. If the system capacity is 5–6 kW, a 10–15 kWh energy storage battery is recommended;
3. If you want to achieve 24/7 off-grid operation, you can choose a higher capacity energy storage system, such as the stacked energy storage battery or home energy storage system provided by GreenMore.

GreenMore Recommended Products:

• Wall-mounted energy storage battery: suitable for urban residences with limited space;
• Stacked energy storage battery: modular design, supporting flexible expansion;
• Home energy storage system: integrates photovoltaics, inverters, and energy storage into one, and can be deployed with one click.

4.Other influencing factors

Before actual installation, the following factors need to be considered:

5. How GreenMore can help you customize your solution

GreenMore provides one-stop home energy management services, covering:

• Solar energy system capacity assessment and design
• Energy storage system selection and configuration
• Smart Energy Management System (EMS) deployment
• International customer technical support and after-sales service

Our team of engineers can recommend the most suitable PV + energy storage combination solution for you based on your household electricity usage habits, geographical location and budget to ensure efficient system operation and maximize return on investment.

6.Conclusion

"How big a solar system do I need for my home?" The answer to this question depends on many factors, including your electricity usage habits, roof conditions, geographic location, and whether there is an energy storage system. Through scientific calculations and reasonable planning, you can accurately configure a photovoltaic system that can meet your daily electricity needs and save electricity bills.

GreenMore is committed to providing safe, intelligent and efficient home energy storage solutions to home users around the world. No matter where you are, we will provide you with professional product and service support to help you move towards a green energy life.

If you are planning a home photovoltaic project, please visit GreenMore's official website www.gmsolarkit.com to contact our international business team for free consultation and personalized solution recommendations.

The full name of the energy storage battery BMS management system is Battery Management System.

The energy storage battery BMS management system is one of the core subsystems of the battery energy storage system, responsible for monitoring the operating status of each battery in the battery energy storage unit to ensure the safe and reliable operation of the energy storage unit.

The BMS battery management system unit includes a BMS battery management system, a control module, a display module, a wireless communication module, electrical equipment, a battery pack for powering electrical equipment, and a collection module for collecting battery information of the battery pack. Generally, BMS is presented as a circuit board, that is, a BMS protection board, or a hardware box.

The basic framework of the battery management system (BMS) includes a power battery pack housing and a sealed hardware module, a high-voltage analysis box (BDU) and a BMS controller.

1. BMU master controller

Battery Management Unit (BMU for short) refers to a system for monitoring and managing battery packs. That is, the BMS motherboard that is often said, its function is to collect the adoption information from each slave board. BMU management units are usually used in electric vehicles, energy storage systems and other applications that require battery packs.

BMU monitors the status of the battery pack by collecting data on the battery's voltage, current, temperature and other related parameters.

BMU can monitor the battery's charging and discharging process, as well as control the rate and method of charging and discharging to ensure the safe operation of the battery pack. BMU can also diagnose and troubleshoot faults in the battery pack and provide various protection functions, such as overcharge protection, over-discharge protection and short-circuit protection.

2. CSC slave controller

The CSC slave controller is used to monitor the module's single cell voltage and single cell temperature problems, transmit information to the main board, and has a battery balancing function. It includes voltage detection, temperature detection, balancing management and corresponding diagnosis. Each CSC module contains an analog front-end chip (Analog Front End, AFE) chip.

3. BDU battery energy distribution unit

The battery energy distribution unit (BDU for short), also called the battery junction box, is connected to the vehicle's high-voltage load and fast-charging harness through a high-voltage electrical interface. It includes a pre-charging circuit, a total positive relay, a total negative relay, and a fast-charging relay, and is controlled by the main board.

4. High-voltage controller

The high-voltage controller can be integrated into the mainboard or can be independent, real-time monitoring of batteries, current, voltage, and also includes pre-charge detection.

The BMS management system can monitor and collect the state parameters of the energy storage battery in real time (including but not limited to single cell voltage, battery pole temperature, battery loop current, battery pack terminal voltage, battery system insulation resistance, etc.), and perform necessary analysis and calculation on the relevant state parameters to obtain more system state evaluation parameters, and realize effective control of the energy storage battery body according to specific protection and control strategies to ensure the safe and reliable operation of the entire battery energy storage unit.

At the same time, BMS can exchange information with other external devices (PCS, EMS, fire protection system, etc.) through its own communication interface and analog/digital input and input interface to form linkage control of each subsystem in the entire energy storage power station, ensuring the safe, reliable and efficient grid-connected operation of the power station.