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How to bulit home solar power system?

Nov,06,2019 << Return list

1. Factors to be considered in the design of a home solar power generation system

1-1. Where is home solar power used? How is the solar radiation in the area?

1-2. What is the load power of the system?

1-3. What is the output voltage of the system, DC or AC?

1-4. How many hours does the system need to work per day?

1-5. In case of rainy weather without sunlight, how many days does the system need to supply power continuously?

1-6. In the case of load, pure resistive, capacitive or inductive, what is the starting current?

2. To build a personal photovoltaic solar power generation system for ordinary families, seven things are mainly needed

2-1. Solar panels

2-2. Solar bracket (mountingsystem)

2-3. Cables

2-4. Solar inverter

2-5. Solar Controller

2-6. Composition of battery (group)

2-7. Meters installed by the grid company

Solar panels: The solar panels are the core part of the solar power supply system and the most valuable part of the solar power supply system. Its function is to convert the radiant energy of the sun into electrical energy, or send it to the battery for storage, or to push the load to work. The quality and cost of solar cell components will directly determine the quality and cost of the entire system.

Selection of solar cell modules - the specific load, quantity, and power of the system, and the time each type of load needs to work every day. (this is the most critical question)

Types and characteristics of solar cells:


Mono-crystalline solar cell
Poly-crystalline solar cellAmorphous silicon solar cell
Conversion efficiency12%-18%10%-16%6%-8%
Service life(year)15-2015-205-10
average priceexpensivenormalCheap
stabilitygoodgoodpoor stability(decay)
colorblack/dark bluedark blue crystalbrown
advantagesHigh conversion efficiency, stable operation, and small sizeStable work and low cost. Widely used.Low price, good low light performance, mostly used in calculators, electronic watches, etc.
shortcominghigh costlow conversion efficiencyThe conversion efficiency is the lowest and will decay. The area of the same power is more than double that of crystalline silicon.

Solar controller: The function of the solar controller is to control the working state of the entire system, and to protect the battery from overcharge and over-discharge. In places with large temperature differences, a qualified controller should also have the function of temperature compensation. Other additional functions such as light-controlled switches and time-controlled switches should be optional on the controller.

Battery: generally lead-acid battery, in small and microsystems, nickel-hydrogen battery, nickel-cadmium battery, or lithium battery can also be used. Its function is to store the electrical energy supplied by the solar cell module when there is light and release it when needed.

Types and characteristics of batteries:


lithium battery

Nickel-cadmium batteriesNiMH batteries

Maintenance-free lead-acid battery

colloidcommon acid
Charge and discharge characteristicsNo memory effect, long use time, repeated charging can reach more than 1200 times. 2 hours of fast charging.The charging and discharging can be repeated more than 500 times, but the memory effect is obvious.There is no obvious memory effect, and it can be used at any time and can be repeated more than 500 times. 1.2 hours of fast charging.Resistant to deep discharge, the recovery performance is excellent in the state of power loss, and will not lose capacity due to several power losses. Long life, up to 10 years.Loss of capacity due to loss of electricity several times will easily make the battery scrapped. The service life is generally 2-3 years.
capacity Lithium batteries of the same capacity are 50% lighter than nickel batteries, and the single-cell voltage is 3.6VThe monomer voltage is 1.2V. The capacity is 200mAh-14000mAhThe cell voltage is 1.2V, and the capacity is 1.5-2 times that of the same volume of nickel-cadmium batteriesThe single voltage is 2V, 6V, 12V, the capacity is 5.5Ah-180Ah, 2V can reach 3000AHSingle unit voltage is 2V, 6V, 12V, capacity 5AH-200Ah, 2V can reach 3000Ah
Scope of applicationMobile communications, alarm systems, instrumentation, daily necessities, etc.Solar system, UPS, communication equipment (2V) electric vehicle, power generation, data engineering, etc.

Inverter: An inverter is a device that converts direct current (DC) into alternating current (AC). It consists of an inverter bridge, control logic, and filter circuit. The electricity generated by solar panels is a direct current, and household appliances cannot be used directly. The inverter also has an automatic voltage regulation function, which can improve the power supply quality of the photovoltaic power generation system.

3. Design of Solar Power Supply System

The power of the household solar power supply system needs to be determined according to the power required by the household appliances. It can be estimated from the type of household appliances, power size, quantity, and usage time.

2400W Home / Office Solar Power System

Design load electrical equipment nameSpecificationsPower consumptionNumberdaily working hoursDaily power consumption
 Illuminationenergy saving lamps11W86528Wh 
ComputerLCD100W 251000Wh 

Fax machine

inkjet150W 12300Wh 
Washing machine
Microwave oven
Air conditioner1.5 HP1200W156000Wh 

Satellite TV receiver/VCD

Colour television21inch95W16570Wh
Water pump


Design for less use of electrical appliances

800W Home / Office Solar Power System

Design load electrical equipment nameSpecificationsPower consumptionNumberdaily working hoursDaily power consumption
 Illuminationenergy saving lamps11W64264Wh

Fax machine150

Washing machine
Microwave oven

Satellite TV receiver/VCD

Colour television21inch70W16420Wh
Water pump



 The solar cell module is the core of the system and the most expensive part. Customers must provide the name, quantity, power, and daily use time of household appliances. Without these data, manufacturers cannot make product plans or make quotations. According to the data in the "Off-Grid Power Generation System Questionnaire" provided by customers in different countries, the manufacturer cannot make a plan at all. At least the name, quantity, and use time of the electrical appliance are required, and the approximate power can be estimated in China. If you need a detailed product plan, you must have detailed survey data.