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

Рет қаралды 22,175

Күн бұрын

Пікірлер: 63

@cleversolarpower Жыл бұрын

UPDATE: the NH00-fuse has an Icc of 25.000A, not 120.000A as stated in the video. 🎁 Free diagrams: cleversolarpower.com/free-diagrams/ 📖 My best-selling book: cleversolarpower.com/off-grid-solar-power-simplified

@dyslectische Ай бұрын

Go loke for the new c20 fuse from vetus Encapsulated in glass to prevent fire

@The_Unobtainium 3 ай бұрын

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

@MalLaw-c2q Күн бұрын

FYI MRBF have a 3/8" (9.525mm) Hole for the Battery Stud so work fine with M8, an M10 bolt wont fit!

@cleversolarpower 7 сағат бұрын

Indeed, there are measurements on the details page.

@Sydneywizard Жыл бұрын

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

@cleversolarpower Жыл бұрын

Thank you! Happy holidays!

@rorymax8233 7 ай бұрын

Interesting and valuable information, thank you.

@SiBex_ovh 7 ай бұрын

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

@davidcromapix9083 8 ай бұрын

Thanks , very useful data.

@finleyandtom 9 ай бұрын

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

@cleversolarpower 9 ай бұрын

That is correct.

@2hotscottpro 11 ай бұрын

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.

@cleversolarpower 11 ай бұрын

I recommend using the disconnects switches from bluesea systems. They have less resistance. Read my article on my website about 'how to calculate power loss in a circuit'

@LDirt-v9o 27 күн бұрын

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

@cleversolarpower 27 күн бұрын

You can use a 70V rated mega fuse as well.

@LDirt-v9o 26 күн бұрын

@@cleversolarpower OK thank you very much your videos are very helpful

@williamwilson6499 Ай бұрын

8:17 A quick search says T class fuses do not have sand.

@cleversolarpower Ай бұрын

Silica, it's basically sand.

@caseyl3631 5 ай бұрын

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

@magi-jd2ug 4 ай бұрын

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.

@cleversolarpower 4 ай бұрын

Yes indeed, the DC Icc is 25kA. I didn't make the distinction between AC and DC. Thanks for your comment.

@bobbo2328 24 күн бұрын

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.

@TexasStatesman 3 ай бұрын

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.

@cleversolarpower 3 ай бұрын

I've seen littlefuse have 80VDC fuses, you can check it on currentconnected: www.currentconnected.com/product/lynx-cnn-shunt-fuse/

@Electronzap 11 ай бұрын

Good info.

@ProMace 2 ай бұрын

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)?

@cleversolarpower 2 ай бұрын

Yes, you can add fuses in series as a backup. However, try to limit them because they will create some losses. But fusing every battery in parallel is a good idea and that is what i recommend. If you have a lot of batteries, you can use a MEGA fuse holder from victron so you can add 5 batteries in parallel. MEGA fuses are cheaper then MRBF fuses, but MRBF require less crimping.

@URackADisciprine 11 ай бұрын

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.

@cleversolarpower 11 ай бұрын

The holders are sold separately. Make sure you got the right one. There are different ones for different currents. I think there are two types sold by bluesea systems.

@URackADisciprine 11 ай бұрын

There are two from Blue Sea systems, they are both too large. One is for 110-200A and the other is from 225-400A. I can't find the one I need which is for 70-100A.

@simon359 11 ай бұрын

A lot of the 48 V systems I see use mega fuses, and I didn’t see what you recommended for charge controllers? 48 V system in USA

@cleversolarpower 11 ай бұрын

Some mega fuses are rated for 58V. But people copy from other setups, so they can be faulty. 58V rated mega or midi fuse for charge controllers.

@laurentsosson1739 6 ай бұрын

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

@CityGirlGoneGreen Ай бұрын

So I’m confused The class T is rated for 100-400A On your video about charging lithium batteries in parallel you stated we needed a 50a fuse per battery You then suggested we watch this vid to see which fuse to use but I’m more confused In the battery charging vid You left a link to the type of fuse this fuse clearly states shouldn’t be used I have 3 lithium batteries I want to set up in parallel using bus boxes Which fuse do I need to buy?

@cleversolarpower Ай бұрын

The fuse rating depends on the load your are attaching it to. For example: 1x 12V 100Ah battery with a 1000W inverter draws: (1000W/12.8V)*1.25=98A, so the battery needs to be fused with 100A. Now if you have the same battery with a 2000W inverter, the fuse needs to be double the size (200A). If you have three identical batteries then it depends on the inverter power. Let's say they are 12V 100Ah each and you have a 2000W inverter. We have a total current drawn from the inverter: (2000W/12.8V)*1.25=195A. This current will be drawn from three batteries in parallel. So we divide the current by three: 195A/3batteries = 65A. Now it could be that the batteries are not very balanced so i recommend adding another safety factor of 1.25 to become 81A. A fuse close to this is 100A. A cable that can carry this current is a 6AWG welding cable (rated at 105°C insulation temperature). I recommend checking my video about different capacity batteries in parallel where i go over this. I won't see your reply to this comment, so if you have questions, email me.

@Dave-xr9bc 2 ай бұрын

i have two 12v 200a lifepo4 in serie for a 24v system.what fuse is best for this? i use now a mega fuse.

@cleversolarpower 2 ай бұрын

Did you watch the video?

@TheFlashmark 8 ай бұрын

Why we can't use ANL fuse for 48v LifePO4 batteries pack?

@cleversolarpower 8 ай бұрын

The Icc rating of an ANL fuse is too low.

@ML-hf6ii 6 ай бұрын

@@cleversolarpower why then victron use them? for example they recomend using "Victron ANL 80V 48V"

@deanb949 6 ай бұрын

@@ML-hf6ii I experienced the re-bridging of the fuse element when I used a 80 amp ANL on my 48 volt AGM pack. I had used the ANL as a temporary fuse and it became the permanent. One time my voltage was low on batteries, I plugged into shore/ utility to recharge and that higher than normal current took out the 80 amp ANL, which was still arcing after the main element blew. This video has great info.

@deanb949 3 ай бұрын

@@ML-hf6ii You can trust Victron's product to perform as they specify by way of their reputation. 95% of other ANL fuses are no name copies. I'm sure Victron can elaborate on how their ANL fuse is higher voltage capable.

@ML-hf6ii 3 ай бұрын

@@deanb949 read comment above

@The_Unobtainium 3 ай бұрын

Where can you find T-class for $40? I'm just checking T-class JJS-350A/60/V and it is...$250! a piece😢 the fuse blosk itself is $120. So expensive.

@cleversolarpower 3 ай бұрын

Try Amazon. You can try nh00 fuses as well, they are close to being the same.

@The_Unobtainium 3 ай бұрын

@@cleversolarpower yeah, trying but if you want to go for 200A+ mark for DC the prices are kinda shocking

@mopikozz 5 ай бұрын

Why do i use some people using DC circuit breaker instead of fuse? Isnt DC breaker better in the sense its not single use?

@cleversolarpower 5 ай бұрын

Normally we use fuses with DC because it's cheaper. And they are not blowing. AC breakers can blow more often so we use breakers.

@npvols4321 8 ай бұрын

Please help, i have a 5000watt inverter, 4 x 200 amp hour AGM batteries , and 4 230 watt panels. I think i need a 400amp Class T fuse, but i dont know where to put it ? 12v system Please advise.

@jamesmason7124 5 ай бұрын

No further than 2 feet from the battery but as close as you can and on the positive cable

@johntheaccountant5594 Жыл бұрын

Why can you not use an MCB instead of a fuse?

@cleversolarpower Жыл бұрын

An MCB is more expensive than a fuse. MCB's are used in AC switchboards. In a DC circuit the fuse wil seldom trip, so that's why we use a fuse. However, and MCB is used as a disconnect between the solar panels and charge controller.

@johntheaccountant5594 Жыл бұрын

@@cleversolarpower when you were saying "fuse/breaker" is US$15 dollars, I was thinking that an AC MCB is US$6 and doesn't have to be replaced when it activates.

@2hotscottpro 9 ай бұрын

What size fuse for 920ah 48v is why I’m here.

@cleversolarpower 9 ай бұрын

You need to figure out what load you want to power for the fuse size. For the fuse type, you likely need class-t or NH if it's lithium.

@2hotscottpro 9 ай бұрын

@@cleversolarpower 6k watt inverter with Li bat

@ZIlberbot 9 ай бұрын

except choosing fuse 10 times more than battery capacity, there should be like a precise formula with battery voltage as well, as energy of short circuit battery or power source is Amperage x Voltage x time ....

@cleversolarpower 9 ай бұрын

It is not the fuse rating. It is the short circuit fuse rating, these two are totally different. As you can see on the table different voltages have different short circuit current.