Bestellen Sie jetzt eine neue 24V 100Ah Smart Batterie und sparen Sie 50 €!

Wissen über die Verkabelung von Batterien in Reihen und Parallel

Knowledge of wiring batteries in series and parallel

, by Sally Zhuang, 12 min reading time

When it comes to building a solar power system, one of the most important considerations is how you connect your batteries. Two common methods are connecting batteries in series or parallel. Each method has its benefits and potential problems, so it's important to understand the differences between them before choosing one.

Table of Contents

Part 1 Everything about series connection

Part 2 Everything about parallel connection

Part 3 Comparison between series and parallel connection of LiFePO4 batteries

Frequently asked questions about battery series and parallel connection

Part 1 Everything about series connection

1.1 What is battery series connection?

When it comes to increasing the total voltage output of a battery pack, a series connection of LiFePO4 batteries is often used. Several cells are connected one after the other, with the positive pole of one cell being connected to the negative pole of the next cell until the required voltage is reached. While the total capacity of the battery pack remains the same as that of a single cell, this process provides increased output voltage. Because of its ability to provide high voltage, series connection is often used in applications such as electric vehicles, solar power systems, and building backup power supplies.

Reihenschlatung von LiFePO4 Batterien

Suppose you connect four 12.8V 100 Ah batteries in series. In this case you have a combined voltage of 51.2V while the battery capacity, measured in amp hours (Ah), remains unchanged at 100Ah.

1.2 The functions of the series connection

Increased output voltage: By connecting the cells in series, the output voltage is increased to meet the requirements of high-voltage applications.
Efficient Power Source: Series connections can provide an efficient power source for devices that require high voltage and low current. This is because the voltage increases while the total capacity remains the same.
Battery Management: When charging or discharging batteries connected in series, the system can be easily managed by managing the voltages on each cell.
Safety: Series connections are less prone to overheating because each cell shares the load evenly. This reduces the likelihood of a single cell becoming overloaded or overheated, increasing the safety of the battery pack.
Scalability: Series connection allows for scalability, meaning additional cells can be added as needed to increase the overall voltage output of the system.

1.3 The possible problems of series connection

Reduced total capacity: While the output voltage increases when the cells are connected in series, the total capacity of the battery system remains the same, meaning less energy can be stored.
Risk of Over-Discharge: Discharging a cell in a series-connected battery pack below its minimum safe level could result in permanent damage or even failure of that cell and possibly other cells in the series.
Complex Management Requirements: When cells are connected in series, they must be carefully managed to avoid over- or under-charging, which can result in unbalanced charge and in turn affect the overall health of the battery system .

To mitigate these problems, it is important to ensure that all cells in the series-connected pack have similar capacities and ages. Powerqueen recommends adding new batteries to your battery bank purchased within three months of purchasing your original battery. This ensures that your new batteries have a comparable charge cycle life to your current batteries and can be easily integrated into your existing system. Proper charging and pack voltage monitoring are also essential to prevent overcharging and achieve efficient battery pack operation.

Part 2 Everything about parallel connection

2.1 What is battery parallel connection?

Battery parallel connection refers to the connection of several batteries positive pole to positive pole and negative pole to negative pole. In this configuration, the output voltage of the battery bank remains the same as a single battery, but the overall capacity of the system is increased. Parallel connection is often used in applications where high energy storage is required, such as: b off-grid solar power systems or electric vehicles where longer runtime is required.

Parallelschaltung von Lithium-Eisenphosphat-Batterien

For example, you connect four 12.8V 100 Ah batteries in parallel. In this case you have a combined capacity of 400Ah while the voltage remains unchanged at 12.8V.

2.2 The functions of the parallel connection

Increased Capacity: The main function of parallel connection is to increase the overall capacity of the battery system while keeping the output voltage constant.
Efficient use of energy: Parallel connection allows devices to draw more current without affecting the overall voltage of the system, ensuring more efficient use of energy.
Longer runtime: Parallel connection is often used in applications where longer runtime is required, such as: b off-grid solar power systems or electric vehicles
Improved reliability: By combining multiple batteries in parallel, the system becomes less dependent on a single battery, improving the reliability of the system.
Easy to manage: Because each battery in a parallel connection receives the same voltage, they can be charged and discharged individually without affecting other batteries in the system.
Scalability: Parallel connections enable scalability by adding more batteries as needed to increase the overall capacity of the system.

2.3 The possible problems of parallel connection

While paralleling offers several benefits, it also presents potential risks and challenges that must be considered.
 
Increased risk of overcharging and overheating: Parallel connection increases the overall capacity of the battery system, making it easier to draw more current than the batteries can handle, which leads to overcharging, overheating and even a risk of fire.
Difficulties in balancing charges between batteries: When batteries are connected in parallel, they can become unbalanced due to variations in their capacity or age, resulting in reduced performance and lifespan.
Reduced Efficiency: Parallel connections can result in reduced efficiency because the internal resistance of each battery affects the overall resistance of the system, which can reduce the amount of energy delivered to the load.
 

Part 3 Comparison between series and parallel connection of LiFePO4 batteries

In this section, we will discuss the similarities and differences between series and parallel connections of LiFePO4 batteries.

LiFePO4 Batterien

Similarities:

Ability to increase the overall performance of the battery: Both series and parallel connections can improve the overall performance of the battery pack. Series connection increases the output voltage while parallel connection increases capacity.
Use in various applications: Both series and parallel circuits are used in a variety of applications such as RVs, boats, solar homes, electric vehicles and other off-grid systems.

Differences:

Voltage output: Series connection increases the total voltage output of the battery pack, while parallel connection does not change the output voltage of an individual cell or battery.
Capacity: Parallel connection increases the total capacity of the battery pack, while series connection does not affect the capacity, only the output voltage.
Efficiency: Parallel connection is generally more efficient than series connection because each cell or battery is charged and discharged independently, whereas series connection can be compromised if one cell or battery fails.

In summary, both series and parallel connections of LiFePO4 batteries have similar advantages, but differ in terms of output voltage, capacity and efficiency. The choice of connection type to use depends on the specific application and desired performance characteristics.

Frequently asked questions about battery series and parallel connection

1. How many batteries can you connect in series?

The number of batteries that can be connected in series typically depends on the battery and its manufacturer. For example, Power Queen allows up to 4 of the LiFePO4 batteries to be connected in series to create a 48 volt system. To avoid exceeding the recommended limit for series connected batteries, it is important to check with the battery manufacturer.

2. How many batteries can you wire in parallel?

Generally there is no limit to how many batteries can be connected in parallel as long as they are identical and have the same specifications. However, it is important to ensure that the cable size and battery charging system can handle the increased current draw from parallel connection. It is always recommended to follow the manufacturer's guidelines and seek professional advice when connecting multiple batteries in parallel to ensure optimal performance and safety.

3. Do batteries last longer in series or in parallel?

Series and parallel connected batteries have different effects on their lifespan, so it is difficult to make a definitive statement about which type of connection will make batteries last longer.

In a series connection, batteries are connected together with positive terminals connected to negative terminals, resulting in increased output voltage. This configuration may cause the battery to be subjected to increased stress and heat, which could reduce its overall lifespan. If one cell fails or deteriorates, it can have a negative impact on the entire battery.

On the other hand, in parallel connection, batteries are connected to each other with positive terminals connected to positive terminals and negative terminals connected to negative terminals. The output voltage remains the same as a single battery, but the capacity is increased. Parallel connection distributes the load more evenly across the cells, reducing the risk of overheating and the likelihood of premature failure due to overloading.

Overall, the lifespan of batteries depends on various factors, including battery type, usage patterns, maintenance and temperature conditions. Whether batteries last longer in series or in parallel depends on the specifics of the situation. It is always best to follow the manufacturer's recommendations and seek expert advice when connecting multiple batteries in series or parallel to ensure optimal performance, safety and longevity.

Conclusion

In summary, when building a solar power system or other off-grid systems, it is important to choose the right type of connection for your batteries. Both series and parallel connections have their advantages and disadvantages, and the choice depends on your specific needs and application.

Series connection is ideal for applications requiring high voltage, while parallel connection provides increased capacity for longer runtime. Each connection method has its potential problems, such as: b the risk of overheating or reduced efficiency. To mitigate these risks, proper battery management and maintenance are critical.

When connecting batteries in series or parallel, it is recommended that you follow the manufacturer's guidelines and seek expert advice to ensure optimal performance, safety and longevity. With the right connection type and battery management, you can maximize the performance and energy storage capabilities of your battery pack for off-grid applications.

Leave a comment

Leave a comment


Blog posts

  • Kann ich einen Batterie Backup ohne Solarpaneele verwenden?

    , by Sally Zhuang Can I use a battery backup without solar panels?

    Read more 

  • [Vollständige Anleitung] Trolling-Motor-Batteriesystem: 12V, 24V oder 36V?

    , by Sally Zhuang [Full Guide] Trolling Motor Battery System: 12V, 24V or 36V?

    Read more 

  • [Vollständige Anleitung] Was sind die verschiedenen Arten von Schiffsbatterien?

    , by Sally Zhuang [Full Guide] What are the different types of marine batteries?

    Read more 

Login

Forgot your password?

Don't have an account yet?
Create account

恭喜您获得