How to Size Fuses For Off Grid Solar System

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How to Size a Wire: • How To Size a Wire For...
Available fuse sizes: cleversolarpow...
Welcome back to my comprehensive guide on setting up your solar system. In this sequel to our wire sizing tutorial, we delve into selecting the appropriate fuse size, a vital step to ensure the safety and efficiency of your off-grid solar power setup.
Whether you've seen our previous video on wire sizing or you're jumping straight into fuse selection, this video offers the clarity and detail you need to make informed decisions for your solar system.
In this video, we revisit our example of powering a refrigerator during a grid-down scenario using a 12V battery and a 600W inverter. We start by calculating the total current and choose a fuse that fits perfectly between the calculated current and the maximum wire rating, making the process seem effortless. However, not all scenarios are straightforward; sometimes, finding a suitable fuse requires adjusting the wire size.
I will walk you through several examples, from simple setups to more complex systems involving various components like charge controllers, inverters, and DC to DC-converters. My goal is to equip you with the knowledge to accurately select fuses, avoid common pitfalls, and ensure your system's longevity and safety.
Understanding the nuances between different wire types and their capacity is crucial, as not all wires are created equal. I emphasize the importance of using manufacturer-provided charts and specifications to guide your choices, ensuring compatibility and safety across your solar system.
Highlights of this video include:
- A detailed walkthrough for selecting fuse sizes based on wire current capacity.
- Practical examples to illustrate fuse selection in both straightforward and complex scenarios.
- Tips on navigating the challenges of fuse and wire compatibility.
- A look at why manufacturer-specific charts are indispensable for accurate fuse selection.

[@cleversolarpower]

My book on Amazon: cleversolarpower.com/off-grid-solar-power-simplified
7 Free off-grid solar diagrams: cleversolarpower.com/free-diagrams/

[@adex2000ng]

Thanks very much for your easy and well explained videos. Keep it up

[@brushbum7508]

Thank You ! TAKE CARE..

[@linossinkala7840]

Thax

[@r.timmermann]

Thank you for the so well explained videos. What CAD tool are you using for the diagram drawing? I need it to document my system.

[@cleversolarpower]

Thanks, I use edraw

[@Mar_Dek-02439]

Great

[@herbertvonsauerkrautunterh2513]

My 48v inverter manual says to use a 300a fuse. I'll be using nt or other ceramic fuses. Maybe t class as well . I well need around 100m2 cable

[@cleversolarpower]

You can split them up into 2x 50mm2

[@dre64dre]

Regarding the sizing of the F1 fuse, I notice that you are not including whatever power input that the charge controller is adding to the system. So your F1 fuse only has to relate to the draw (usage)?

[@dre64dre]

And, I meant to say thank you for your wonderful videos

[@dre64dre]

does that further imply that in an inverter-only system (no 24V to 12V DC converter) that the F1 fuse will be the same fuse size as the inverter fuse?

[@RKhuc]

Between 120A and 150A could also be 135Amp..... why 125Amp?

[@cleversolarpower]

Because a 135A fuse is not available.

[@PhG1961]

Schitterend!

[@cleversolarpower]

Bedankt!

[@usamaalikhan7602]

Ac wire sizing for inverter please

[@cleversolarpower]

This should be listed in the manual of the inverter already.

[@Alexander.Grekhov]

How did you come up with these numbers for max amps for the wire gauge? Wikipedia lists completely different numbers:
en.wikipedia.org/wiki/American_wire_gauge

[@cleversolarpower]

Wires don't have the same insulation type. That's why there are wires made for different current carrying capacity. For example 70°C insulation temp and 105°C. Check my video on wire sizing.