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Solar panel and battery configuration calculation formula

Solar panel and battery configuration calculation formulaSolar panel and battery configuration calculation formula

Solar panel and battery configuration calculation formula One: First calculate the current:  Such as: 12V battery system;  The 30W light is 2, a total of 60 watts.  Current = 60W÷12V = 5A   

2: Calculate the battery capacity requirements:  

Such as: streetlights the accumulated lighting time required for full load for 7 hours (h);  

(If you open at 8:00 in the evening, close the 1st road at night, open 2 channels at 4:30 in the morning, close 5:30 in the morning)  Need to meet the lighting demand for continuous rainy days. (5 days also added rainy day a night overnight lighting, gauge 6 days)  Battery = 5A×7×(5 + 1) days = 5A×42H = 210AH  

In addition, in order to prevent the battery overcharge and overhang, the battery is generally charged to about 90%; the discharge remains around 20%.  Therefore, 210AH is also only about 70% of the real standard in the application.   

Three: Calculate the demand peak (WP) of the battery board:  Street lights are required for 7 hours (h) per night.  

★: The average of the battery board has an effective illumination time of 4.5 hours (h);  Leverage 20% of the battery board requirements.  WP÷17.4V = (5A×7×120%)÷4.5H  WP÷17.4V = 9.33  WP = 162 (W) 


Photovoltaic power generation system calculation method 

The scale and application of the photovoltaic system are different, such as the system scale span, small to a few watts of solar garden lights, large to MW level solar photovoltaic power station. Its application form is also widely used in many areas such as household, transportation, communication, and space applications. Although the size of the photovoltaic system is different, its composition structure and working principle are basically the same. 

Solar power generation systems consist of solar cells, solar controllers, and battery (group). If the output power supply is 220V or 110V, it is also necessary to configure the inverter. The role of each part is:  

(one) Solar Panel: Solar panels are the core part of the solar power system and the highest value in the solar power system. Its action is to convert the sun's radiation capabilities into electrical energy, or to store it in the battery or drive the load.  

(two) Solar Controller: The role of the solar controller is to control the working state of the entire system, and the battery is overcharged by overcharge, over-discharge protection. Where a large temperature difference, the qualified controller should also have a function of temperature compensation. Other additional functions such as optical control switches, the time control switch should be optional for the controller;  

(three) Battery: Generally lead acid batteries, small micro-systems, also available nickel-hydrogen batteries, nickel-cadmium batteries or lithium batteries. Its function is to store the electric energy emitted by the solar panel when there is illumination, release it again.  

(Four) Inverter: In many cases, it is necessary to provide 220VAC, 110VAC AC power supply. Due to the direct output of solar energy is 12VDC, 24VDC, 48VDC. In order to provide electrical energy to 220VAC, the DC power emitted by the solar power system is required to convert the DC power energy, so the DC-AC inverter needs to be used. In some cases, when multiple voltage load is required, the DC-DC inverter is also used, such as electrical energy converting 24VDC electrical energy into 5VDC (note, not simple buck). The design of the photovoltaic system includes two aspects: capacity design and hardware design. 

Before performing the design of the photovoltaic system, you need to understand and get some basic data for calculation and selection. The amount of radiation, direct radiation, and scattering radiation, the average annual temperature and the highest, the lowest temperature, the longest continuous rainy days, the largest wind speed, the hail, snowfall, etc. Special weather conditions. 

The battery design includes the design calculation of the battery capacity and the string parallel design of the battery pack. First, the basic method of calculating the battery capacity is given. 

 In the first step, multiply the amount of electricity required for daily loads to obtain a preliminary battery capacity. 

II. In the second step, the battery capacity obtained by the first step is divided by the allowed maximum discharge depth of the battery. Since the battery cannot be completely discharged in the self-sufficient number of days, it is necessary to divide the required battery capacity in the maximum discharge depth. The choice of maximum discharge depth requires the performance parameters of the battery selected in the photovoltaic system, which can be detailed from the battery provider to the largest discharge depth of the battery. Normally, if a deep cycle battery is used, 80% discharge depth (DOD) is recommended; if a shallow cycle battery is used, it is recommended to use 50% DOD. The basic formula for designing the battery capacity is shown in:  

              Self-given days X Day average load     

Battery capacity  =  - Maximum discharge depth  These of course have not been corrected, the following is the correct calculation formula: The capacity BC calculation formula of the battery is:  BC = a×Q L×NL×TO / CCAH (1)  

Where: A is a safety factor, take 1.1 to 1.4;  

QL is average power consumption on load daily, and multiplies the working current by day;  NL is the maximum number of continuous rain days;  

TO is a temperature correction coefficient, typically at 0 ° C, 1, and above -10 ° C is removed from 1.2 or less.  The CC is a depth of battery discharge, and generally lead-acid batteries take 0.75, alkaline nickel-cadmium battery takes 0.85. 

Below we describe the method of determining the battery string. Each battery has its nominal voltage. In order to reach a nominal voltage of the load, we connect the battery to the load, and the number of batteries that require a series of batches is equal to the nominal voltage of the load divided by the nominal voltage of the battery. 

Load nominal voltage              

Number of tandem  = Battery nominal voltage       

The basic idea of ​​the Yang battery module is to meet the annual average daily load. The basic method of calculating the solar cell module is the energy (time number of time required) required by the load average daily (time), which can be generated in one day in one day, so that the system needs to be parallel to solar cells. The number of components can be used in parallel using these components to generate the current required to be required. The nominal voltage of the system is divided by the nominal voltage of the solar cell module, so that the solar cell module needs to be serially connected in series, and the voltage required to generate the system load can be generated using these solar cell components. The basic calculation formula is as follows: Parallel components = daily average load (AH) / Component Day Output (AH)   Number of series components = System voltage (V) / component voltage  Recommend: LiFePO4 Battery Manufacturer Energy storage battery Manufacturer Integrated machine energy storage battery series Manufacturer Lead lithium battery Manufacturer Outdoor Backup Battery Manufacturer Portable outdoor power supply Manufacturer Power battery Manufacturer Powerwall LiFePO4 Battery Manufacturer Battery rack Manufacturers Telecom LiFePO4 Battery Manufacturer Wall mounted battery storage Manufacturer China Lifepo4 Battery