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How to Know What Size Fuses to Use on Your Solar System

4/14/2021

The fuse between the battery bank and the controller is an ABYC wiring standard requirement. Everything between the battery bank and an appliance must be fused to meet the standard and pass boat inspection.

To determine the size of the fuse needed for the solar system, do the following calculation: Watts of solar /12V (or 24V) = amps + 10 amps. For example: 240W solar / 12V = 20 amps +10 amps = 30 amp fuse. Also, many controllers have a built in fuse as a secondary protection. The protection is against a short circuit overheating the wires to cause a fire. There is no reason for a fuse between the solar panels and the controller although many customers use a circuit breaker there for the switch. To calculate the capacity of the switch: Watts of solar / Voc (open circuit voltage) = amps For example: 240W solar / 30V = 8 amps. Note the much lower amperage on the solar side of the controller vs the battery side of the controller in the examples above. That's MPPT. Panels never surge power unless hit by lightning.

12 Comments

Solar Installers Boulder link

7/19/2022 12:33:12 pm

Thank you for sharing this information.

Jerry Roman link

11/17/2022 08:11:39 pm

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Braden Bills link

4/3/2023 10:02:36 am

I want to get a solar panel system installed on my property. It's good to know that you'll need the right size of fuses for that kind of thing! I'll be sure to work with a professional so I can have that put together properly.

Jim Thomas link

4/27/2023 08:35:42 pm

As a language model, I cannot access the internet and the page you provided does not exist. However, I can give you general information on how to know what size fuses to use on your solar system. It is important to consult with a licensed electrician or solar panel installer to ensure the correct size fuses are used for your specific system. Factors to consider include the voltage and amperage of your solar panels, the size of the wires in your system, and the rated current of your charge controller. A professional will be able to make the appropriate calculations and select the correct fuses for optimal performance and safety.

Uchenna Eze

10/31/2023 02:57:12 am

Can you please explain how to size correctly solar fuse using the following information as example:
6 psc 360w solar panels ,each Voc = 43.34V, Isc= 10.19A, Vmp = 36.12V, Imp = 8.86A Wired in "3s2p".
2.2KVA 24V inverter , 80A MPPT Charge Controller 145VDC. two pcs of 220ah Tubular batteries. connected in series

5/18/2023 12:26:29 am

Thank you for sharing the informative article on how to determine the appropriate fuse size for a solar system on your website. As an AI language model, I'm here to provide you with a response.

The article provides valuable insights into selecting the correct fuse size for a solar system, which is essential for maintaining electrical safety and protecting the system components. Understanding the proper fuse size ensures optimal performance and prevents potential damage caused by overcurrent. Here are a few additional points to consider:

1. Importance of Fuse Protection: It's important to highlight the role of fuses in protecting the solar system components. Fuses serve as a safety measure by interrupting the flow of excessive current, preventing damage to the wiring, solar panels, charge controllers, batteries, and other connected devices. Emphasize that fuses are critical components that should not be overlooked in a solar system.

2. System Voltage and Current Considerations: Explain how the voltage and current rating of the solar system components play a crucial role in determining the appropriate fuse size. Highlight that the fuse size should be selected based on the maximum current that the system can produce or handle safely. Provide guidance on calculating the maximum current using the system's voltage and the power rating of the solar panels.

3. Fuse Sizing Guidelines: Offer guidelines or reference charts that assist readers in determining the appropriate fuse size based on the calculated maximum current. Include considerations such as ambient temperature, system design, and manufacturer recommendations. This will provide readers with a practical reference point for selecting the right fuse size for their specific solar system setup.

4. Overcurrent Protection for Different System Components: Explain that different components within a solar system may require specific overcurrent protection. For example, the solar panels, charge controller, battery bank, and inverter may each have different current ratings and corresponding fuse requirements. Providing an overview of the fuse size considerations for each component helps readers ensure comprehensive overcurrent protection.

5. Safety Precautions: Remind readers to prioritize safety when working with fuses and electrical systems. Encourage them to disconnect the power source, wear appropriate personal protective equipment (PPE), and follow proper installation procedures. Stress the importance of consulting a qualified electrician or solar system professional for guidance, especially if they are unsure about fuse sizing or installation.

By providing guidance on selecting the correct fuse size for a solar system, you are equipping readers with the knowledge to make informed decisions and maintain the safety and performance of their solar installations.

Gabriel Zulu

6/23/2024 11:37:13 am

The information provided is very helpful. I have benefitted a lot with all that you posted about solar system. Thanks a lot and keep it uo.

Caleb Weiner

12/20/2023 09:17:10 am

Why are you adding 10amps to the number you get? What's tye point of that?

caleb

2/9/2024 04:26:56 pm

Can I ask why you add 10amps at the end of your calculation to get a fuse size?

Bades

3/8/2024 07:58:50 am

Why do you add 10 amps to the calculation?

Hawthorne Drapery link

5/14/2024 07:24:58 am

Verry creative post

Best Solar Perth link

1/6/2025 11:59:07 pm

Great guide! Clear and concise explanation of selecting the right fuse size for a solar system. Perfect for beginners!

How to Know What Size Fuses to Use on Your Solar System

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