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Battery Cable Amperage Capacity Chart

Short on Time? Here’s The Article Summary

The article explains how to determine the appropriate size for battery cables using a battery cable amperage capacity chart. It starts by discussing amperage as a measure of current needed for appliances and how to calculate it based on appliance wattage. It then explains voltage, which is required to keep electrons moving in an electrical circuit, and how to match cable size to voltage requirements.

Sizing cables involves considering factors like amperage capacity, voltage, and cable diameter. The article provides a chart showing the relationship between cable size and amperage capacity for different lengths and amperages, helping readers select the right cable for their needs. Understanding these principles ensures efficient and safe use of cables in various electrical systems.

Introduction

A battery cable amperage capacity chart is a great way to determine the size of your cable and understand the relationship between amperage and battery capacity. 

However, without sufficient knowledge of the battery and its cables, the charts may seem convoluted with values and different units of power.

Let’s dive into all the units of power we’re going to use in our chart as well as how to appropriately size your cable.

Dealing with Amperage 

Amps are a unit of measurement for current. 

The appliances connected to your battery need a certain amount of amps to function. 

battery cable ampacity chart

An inverter, for instance, might use 100 amps of current, but a light bulb might only need 2  amps. 

The total current demands of all your appliances will give you the required maximum amperage.

Devices may occasionally have watt ratings rather than amp ratings.

In this situation, simply divide the quantity for watts by your system's voltage to get the amperage requirements. 

When a device claims to consume 120 watts, 120 watts divided by 12 volts equals 10 amps.

Wire gauge voltage charts use amperage, voltage, and the diameter of the cable to help find the perfect cable for your system.

Voltage

Electrons are used in electrical circuits to transfer electricity, but in order for them to be constantly moving, they require some sort of pressure. 

Meet Voltage, our companion.

A positively charged and a negatively charged terminal work together to produce voltage. Electrons move from the negative end of a battery to the positive end. 

Yet, your power company provides the voltage when you plug equipment into a wall.

Battery cable capacity chart

We must understand voltage since many circuits can only handle a particular range of voltages. 

For instance, if you buy a fan and its voltage rating is higher than your wall socket, the fan can break and possibly start to smoke.

Understanding voltage as a variable makes using high or low-voltage wire length charts or a low-voltage wire gauge chart a breeze.

Sizing Your Cables

Sizing your cable is important in ensuring that enough current can flow through and is sufficient enough to match your system needs.

Consumers often simply provide a single response when determining the ideal battery cable size.

How much amperage can I send through my cable at a time?

As much as you may determine the answer to this issue by consulting a battery cable ampacity chart, there are more considerations to take into account.

Whichever size you decide upon, the desired outcome should be a respectable voltage drop at the cable's end.

Amperage flowing through the cable and the overall resistance of the cable itself both contribute to voltage drop.

If you are unable to shorten the cable, look for high ambient temperatures. Imagine that your wire has been exposed to heat or light.

Most solar wire size calculators take these factors into consideration, but you can also record these variables in real time if you prefer to calculate things on your own. 

Battery cable capacity rating chart

You can use a variety of calculators online to determine voltage drops using data from different charts. 

Your objective or goal while calculating the voltage drop should be below 3%. Usually, this is accomplished by altering the calculator's wire size variable.

Moreover, voltage drop can be manually computed. 

You multiply the cable length in meters by the current measured in amps.

The system's single-phase or three-phase amperage is then divided by this value.

Let the computer handle everything since a calculator will provide you with a more accurate value.

Battery Cable Size Chart

If you have a 12V LiFePO4 battery, you’d want a pair of cables that complement the battery’s capacity. For example, the AIMS Lithium 24V Battery is a small but efficient piece of equipment, and to get the most out of it, you need to make sure you have compatible gear.

Battery cable current capacity chart

Using the American Wire Gauge is the most typical technique for calculating the battery cable size.

The fact that the smallest wire size gets the highest number can be perplexing at first. This amount is forty.

It goes up to size 39 if you want to move one size from the least number. Up until the number 1, it gets smaller.

The smaller cable size comes to a close.

Beginning with zero, the medium and big sizes are listed. Going one size larger from zero results in double zero, triple zero, and quadruple zero.

The diameter of the cable grows by 1.123 every time the wire size is increased by one.

The International Electrotechnical Commission is the other benchmark for measuring battery cable size.

This is an easy strategy as it divides the classes of cable sizes depending on the cross-sectional area of the cable. The measurement is in millimeters squared.

Battery cable ampacity rating chart

Finding the size you need is made simpler by using a wire gauge voltage chart. To determine the diameter or thickness of a cable or wire, use a wire gauge.













Current (A)

0-5

16 AWG

16 AWG

16 AWG

16 AWG

14 AWG

12 AWG

12 AWG

5-10

16 AWG

16 AWG

14 AWG

12 AWG

10 AWG

10 AWG

10 AWG

10-15

14 AWG

14 AWG

12 AWG

10 AWG

10 AWG

8 AWG

8 AWG

15-20

14 AWG

12 AWG

12 AWG

10 AWG

8 AWG

6 AWG

6 AWG

20-25

12 AWG

10 AWG

10 AWG

8 AWG

6 AWG

6 AWG

6 AWG

25-30

10 AWG

10 AWG

10 AWG

8 AWG

6 AWG

6 AWG

4 AWG

30-40

8 AWG

8 AWG

8 AWG

6 AWG

6 AWG

4 AWG

4 AWG

40-50

8 AWG

8 AWG

6 AWG

6 AWG

4 AWG

4 AWG

2 AWG

50-60

6 AWG

6 AWG

6 AWG

4 AWG

4 AWG

2 AWG

2 AWG

60-70

6 AWG

6 AWG

4 AWG

4 AWG

2 AWG

2 AWG

1/0 AWG

70-80

4 AWG

4 AWG

4 AWG

4 AWG

2 AWG

2 AWG

1/0 AWG

80-90

4 AWG

4 AWG

4 AWG

2 AWG

2 AWG

1/0 AWG

1/0 AWG

90-100

2 AWG

2 AWG

2 AWG

2 AWG

2 AWG

1/0 AWG

1/0 AWG

100-120

2 AWG

2 AWG

2 AWG

2 AWG

1/0 AWG

1/0 AWG

2/0 AWG

120-150

1/0 AWG

1/0 AWG

1/0 AWG

1/0 AWG

1/0 AWG

2/0 AWG

4/0 AWG

120-150

1/0 AWG

1/0 AWG

1/0 AWG

1/0 AWG

1/0 AWG

2/0 AWG

4/0 AWG

150-200

2/0 AWG

2/0 AWG 

2/0 AWG

2/0 AWG

2/0 AWG

4/0 AWG

4/0 AWG

0-4

4-7

7-10

10-15

15-20

20-25

25-30

Length in Feet

Battery Cable Amperage Capacity Chart

Both the positive cable and the negative cable need to be taken into account when figuring out how much cable you need for your circuit. 

Since the negative cable will also be 10 feet from the battery, a 10-foot run from the battery will actually be a 20-foot run overall.

Battery cable ampacity calculation chart

If you want to know what size cable as well as the length of it you need for the amperage of your battery, use the battery cable amperage capacity chart below. 

If the system you’re looking at has a higher voltage than normal, have a look at the high voltage cable size chart.

Battery Cable Size

50 Amps

100 Amps

150 Amps

200 Amps

300 Amps

6 AWG

11.8 ft

5.9 ft 

4.4 ft

2.9 ft

2.2 ft

4 AWG

18.8 ft

9.4 ft

6.3 ft

4.7 ft

3.1 ft

2 AWG

29.8 ft

14.9 ft

9.9 ft

7.4 ft

4.9 ft

1 AWG

37.7 ft

18.9 ft

12.6 ft

9.4 ft

6.3 ft

1/0 AWG

47.5 ft

23.8 ft

15.9 ft

11.9 ft

7.9 ft

2/0 AWG 

60 ft

30 ft

20 ft

15 ft

10 ft

3/0 AWG

75.6 ft

37.8 ft

25.2 ft

18.9 ft

12.6 ft

 

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Article by

Alex S

Alex is a co-founder of Shop Solar, a company that he established in 2018 to revolutionize the solar industry by simplifying the process and making it more simple and cost-effective. Under his strategic leadership, Shop Solar has grown into a comprehensive one-stop-shop, empowering over 40,000+ customers to access top-quality solar and storage solutions, comprehensive information, intuitive tools, and professional installation services.

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