What Size Cable From Solar Panel to Inverter

What Size Cable From Solar Panel to Inverter?

When it comes to setting up a solar power system, choosing the right cable size is crucial for optimal performance and safety. The cable connecting the solar panels to the inverter plays a vital role in transmitting the generated power efficiently. In this article, we will discuss the factors that influence the cable size selection, provide a general guideline, and answer some frequently asked questions to help you make an informed decision.

Factors Influencing Cable Size Selection:

1. Current Carrying Capacity: The cable must be able to handle the maximum current flowing from the solar panels to the inverter without overheating. As a general rule, higher current requires a larger cable size.

2. System Voltage: The voltage of the solar power system also affects cable sizing. Higher voltage systems require smaller cable sizes to minimize voltage drop.

3. Cable Length: Longer cable runs introduce higher resistance, resulting in voltage drop. To compensate for this, larger cable sizes are needed to reduce losses.

4. Ambient Temperature: Higher temperatures increase cable resistance, which can lead to excessive power losses. Therefore, cable size should be selected considering the maximum temperature in the installation area.

General Guideline for Cable Sizing:

To determine the ideal cable size from solar panel to inverter, you need to consider the following steps:

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1. Calculate the System Current: Determine the total current produced by the solar panels. This can be done by adding up the rated current of each panel.

2. Consider Voltage Drop: Calculate the allowable voltage drop based on the system voltage and desired performance. For example, a 2% voltage drop is commonly accepted, but you may choose a different value based on your requirements.

3. Find the Cable Size: With the system current and allowable voltage drop in mind, refer to a cable sizing chart or consult a professional to find the suitable cable size. The chart will provide the recommended cable size based on the current capacity and voltage drop.


1. What happens if I use an undersized cable?

Using an undersized cable can lead to excessive voltage drop, causing reduced system performance and potential damage to the inverter. It may also pose a safety risk due to cable overheating.

2. Can I use a larger cable than recommended?

Using a larger cable than recommended can be beneficial as it reduces voltage drop and future-proofs your system. However, it may increase the upfront cost of installation.

3. How is cable size specified?

Cable size is specified using American Wire Gauge (AWG) or square millimeters (mm²). AWG is commonly used in North America, while mm² is more prevalent internationally.

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4. Can I extend the cable length without affecting system performance?

Extending the cable length increases resistance and voltage drop. To compensate, you will need to use a larger cable size to maintain optimal performance.

5. Are there different cable requirements for AC and DC systems?

AC systems typically require larger cable sizes due to higher current flows compared to DC systems.

6. Should I choose copper or aluminum cables?

Copper cables have better conductivity and are more commonly used in solar power systems. Aluminum cables can be used but require a larger size due to their lower conductivity.

7. Do I need a professional to determine the cable size?

While it is possible to calculate the cable size yourself, it is recommended to consult with a professional solar installer or an electrical engineer to ensure accurate sizing and compliance with local regulations.

In conclusion, selecting the right cable size from solar panel to inverter is crucial for optimal performance and safety. Considering factors like current carrying capacity, system voltage, cable length, and ambient temperature will help determine the appropriate cable size. It is always advisable to consult with professionals for accurate sizing and compliance with local regulations to ensure the success of your solar power system.

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