Choosing the Right Fuse Type for Off-Grid Solar: Expert Guide for 12V to 48V Battery Systems

Welcome to my comprehensive guide on selecting the right fuse type for your off-grid solar power system. In this video, we delve into the world of fuses for solar setups, exploring six different kinds of fuses to ensure your system is not only efficient but also safe.

We start with the MIDI fuse, ideal for 12 and 24V batteries, and move up to the MEGA fuse, suitable for similar voltage ranges but with higher current. For those using 12, 24, and 48V lead-acid batteries, the MRBF fuse is a perfect choice. We also cover the ANL fuse for 12 and 24V systems, the Class-T fuse for high-capacity lithium batteries up to 48V, and the NH00 fuse, a popular choice in Europe for similar applications.

Each fuse type is broken down by its specifications, including voltage, current, ICC rating, and cost, along with recommendations for appropriate fuse holders. I will also discuss why the interrupt current capacity (ICC) is a crucial safety feature, especially in high-current scenarios typical of lithium batteries.

Understanding the importance of battery voltage in arcing, I explain why selecting the right battery fuse is essential, particularly in high-voltage systems like 48V lithium batteries.

For reliable and safe installations, I recommend top brands like Blue Sea Systems, Littlefuse, Bussman, Siemens, Schneider, and Victron. These brands offer the quality and reliability you need for peace of mind in your solar power setup.

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00:00 Introduction
00:21 MIDI fuse
01:39 MEGA fuse
02:40 MRBF fuses
03:50 ANL fuse
04:44 Class-T fuse
05:25 NH00 fuse
06:35 Icc and battery voltage
08:29 Quality fuses and breakers
09:09 end

[cleversolarpower]

UPDATE: the NH00-fuse has an Icc of 25.000A, not 120.000A as stated in the video.

[The_Unobtainium]

This is the best summary in this subject so far! Thank you.

[Sydneywizard]

Thanks for sharing and educating us with your knowledge. Its much appreciated and Merry Christmas to you.

[jackdolphy]

Given that I myself have no way to 'corroborate' or test your information here, and thus assuming that you have got it all correct (which it seems that you do :) this is a must watch video. Ever many thanks!!!

[rorymax]

Interesting and valuable information, thank you.

[SiBex_ovh]

If you show a example with Rate Table for ex. Class-T then this video will be perfection.

[javierzamora]

Thank you for your efforts on your videos And I got your books 📚 ❤️

[hotscottpro]

Good info.I was looking to upgrade fuses and battery shut-offs.I have cheap fuse you showed, top left one showed in group of 4.
My positive shut off post gets warm from 800 watts using 1500 watt heater on low.I know heat makes them fall apart.Bussman 187 series push button disconnects are $55.

[finleyandtom]

Thanks for a super clear and informative video -
So i am correct im thinking that with a 12v 105ah lithium battery i would be ok to fuse the main connection from the battery with a suitably sized midi or mega fuse ? 105x10 = 1050 amps max during short - IIC for a midi fuse is 5000A and 2000A for a mega

[caseyl]

are there resetable fuses / breakers out there that you recommend that can do 300amps or more?

[Shaman]

I have just built a portable emergency set up. With an invicta SNL12V200BT Battery, 1500 watt inverter, victron 12-12-30 DC to DC charger and victron 100/50 mppt charge controller. Using short ebs6 cables and bus bars. What size fuse should I put on battery? I noticed the DC-DC Manuel says a 60 Amp fuse, this can't be correct or is it?

[LDirt-vo]

Hi there im glad i saw this video, i have installed a 125 amp megafuse in my victron power in 48 volt system with 5000 pylontech battery, so this is wrong, i should change it to a class_t fuse

[tomislavpaic]

Please advise, I have a trolling motor (max current 50A per hour, power 600W), which will be powered by a lifepo4 12V 100Ah battery. I received a recommendation that to protect the trolling motor it would be good to install a T-class fuse (up to how many Amps). Please give me your opinion is that ok, or I should put some other fuse

[magi-jdug]

You better make sure your recommendations are correct, the NH00 fuse from siemens does not have an ICC of 120kA at DC voltage, it's only 25kA.
Have a look in the datasheet.

[ProMace]

Great video, thanks! I'm planning to build a 48V setup. I know that Class-T or NH00 are advised because of their high ICC, but can't I use a combination? For instance, put an MRBF fuse on each positive battery terminal and then put a single Class-T fuse between the battery busbar and the inverter (being the only load)?

[TexasStatesman]

Renogy sells an ANL fuse rated for 72v and provides a spec sheet. I'd be interested in your thoughts on. It is the only ANL fuse I can find rated more than 24v.
Thanks for the valuable information.

[andrievbastichy]

oh man... i just saw this video.. and im looking at the same fuses i ordered being on the not recommended list.. lmao.. the big one with the switch haha.

[laurentsosson]

Hello and congratulations for the tests with the fuse
I would like to ask you something
I have a large LFP battery pack (EVE 280K) in 9S 4P or 28 volts 1120AH and my voltage converter is 4000 watts to 28 volts
which fuse do you recommend between the + of the converter?
150A?
fuse like yours or a fixed fuse like VICTRON?
THANKS
laurent

[bobbo]

Using a fuse for each parallel panel and a fuse for each grouping of panels in series my questions is each 400w panel needs a 20 amp fuse and the 5 panel grouping will need a 100a fuse what fuse would you suggest.

[URackADisciprine]

I have found Class-T fuses lower than 100A from Bussman and LittelFuse in my searches. Am looking to get an 80A (something like LittelFuse JLLN080P 80A 200KA) for a 48V LiFePO4 battery but no clue which holders will work with that. Wish they were sold as a pair.