Is this fuse suitable for 48V DC between battery and inverter?  Will it extinguish the dc arc?  It's being sold as battery fuse at retailer.  I've installed it but am now questioning whether it is correct.

 

The AC690V seems to be highlighted.

Other fuses that are sold as battery fuses also don't have DC on it?

 

 

 

Edited July 30, 20232 yr by MPAD
added question

Just Google the datasheet to be sure.  CHiNT is definitely DC rated (the highlighting just seems to be marketing related).

Jean Muller has a separate range of DC rated fuses - the one shown is not DC rated.

SLFC is 'interesting' - there is no indication anywhere on the labelling or documentation that it is DC rated, but the product website says it is for DC application.

Personally, of the three, I would stick with the CHiNT which is explicitly labelled as DC.

What size battery and what inverter? That fuse is rated only for 80A. 

3 hours ago, MPAD said:

Is this fuse suitable for 48V DC between battery and inverter?

The DC rating is DC250V 100kA. I would therefore say yes as long as your inverter output does not exceed 48V x 80A = 3840W.

24 minutes ago, PowerUser said:

What size battery and what inverter? That fuse is rated only for 80A. 

4.91kw (https://deye.com/product/sunb-5-0-g01-48-pc/) and 5kw (https://www.sunsynk.org/5kw-hybrid-inverter)

It's my first install so went for smaller fuses just in case - will upgrade 125A later, if that is correct?

28 minutes ago, Kilowatt Power said:

The DC rating is DC250V 100kA. I would therefore say yes as long as your inverter output does not exceed 48V x 80A = 3840W.

Thanks, that's what i wanted to know

28 minutes ago, MPAD said:

4.91kw (https://deye.com/product/sunb-5-0-g01-48-pc/) and 5kw (https://www.sunsynk.org/5kw-hybrid-inverter)

35 sq.mm battery cable and 160A fuse would have been more ideal from the onset.

28 minutes ago, MPAD said:

It's my first install so went for smaller fuses just in case - will upgrade 125A later, if that is correct?

What's the cross sectional area of your battery cable?

Description on Aliexpress attached. 

40 minutes ago, Kilowatt Power said:

35 sq.mm battery cable and 160A fuse would have been more ideal from the onset.

What's the cross sectional area of your battery cable?

70mm battery cable, cause battery can go up to 125A for a short time

17 hours ago, MPAD said:

70mm battery cable, cause battery can go up to 125A for a short time

The 70mm² is a bit of a overkill on 5kw inverter but no harm if it is already installed. I agree with @Kilowatt Power160 amp fuse and 35mm² would have been adequate. 

Just for reference good quality fine strand 70mm² battery cable can handle current of up to 500 amps due to surface area of the fine strand manufacturing the more flexible the cable the higher the strand count hence the reason welding cable are super flexible.

Correction: Class 2 cables less flexible lower resistance than class 5 and 6 cables thus class 2 cables has a higher amp rating than class 5( battery cable) and class 6( welding cable) 

Edited July 31, 20232 yr by TaliaB

1 hour ago, TaliaB said:

The 70mm² is a bit of a overkill on 5kw inverter but no harm if it is already installed. I agree with @Kilowatt Power160 amp fuse and 35mm² would have been adequate. 

Just for reference good quality fine strand 70mm² battery cable can handle current of up to 500 amps due to surface area of the fine strand manufacturing the more flexible the cable the higher the strand count hence the reason welding cable are super flexible.

Regarding the cable size, maybe I was searching for the wrong type.  Can you sent me the reference where you found 35mm2 cable for 125A?

The Sunsynk manual lists this:

 

But when I checked a few of the cable specs, 70 sq.mm for 125A (+25% extra just in case)

Eg.

Below site sells 70mm2 cable as max current 151?

https://www.sustainable.co.za/products/single-core-70mm-hv-dc-cable-1m-red?_pos=7&_sid=2b29cebc8&_ss=r

Another site lists the below:

Edited July 30, 20232 yr by MPAD
added some info

2 hours ago, MPAD said:

Regarding the cable size, maybe I was searching for the wrong type.  Can you sent me the reference where you found 35mm2 cable for 125A?

The Sunsynk manual lists this:

 

But when I checked a few of the cable specs, 70 sq.mm for 125A (+25% extra just in case)

Eg.

Below site sells 70mm2 cable as max current 151?

https://www.sustainable.co.za/products/single-core-70mm-hv-dc-cable-1m-red?_pos=7&_sid=2b29cebc8&_ss=r

Another site lists the below:

https://flexicor.co.za/portfolio/battery-cable-2/

@MPADI get all my battery cables from Flexicor in Wadeville Germiston good quality battery cables.

Edited July 30, 20232 yr by TaliaB

On 2023/07/30 at 12:33 PM, Kilowatt Power said:

The DC rating is DC250V 100kA. I would therefore say yes as long as your inverter output does not exceed 48V x 80A = 3840W.

From

CHINT West Asia&Africa

"

Hi,

 

Thanks for your attention to CHINT.

 

We do not have fuse for DC48V application

"

Edited August 1, 20232 yr by MPAD

On 2023/07/30 at 8:45 PM, TaliaB said:

https://flexicor.co.za/portfolio/battery-cable-2/

@MPADI get all my battery cables from Flexicor in Wadeville Germiston good quality battery cables.

So a bit of a thread revival, although maybe this can help someone else further down the line.

I reached out to get pricing on their 50mm battery cable, although they did not have stock at the time and they have a lead time of 4 to 6 weeks to manufacture more of that cable... I couldn't wait so I found JE Wholesalers (Neels - 082 935 8462) who are based in Randburg and had some 50mm battery cable at a really good price (similar price compared to Flexicor).

To me, this 50mm cable seems really nice and is what I was looking for, it is annealed copper with the double insulation and fine strands so very flexible and easy to work with. I have not yet installed it though as I need to finish building my battery.

 

Here is a picture of the black 50mm cable, their cable is from Empire Cable it seems (well, the 50mm one is at least).

Edited August 15, 20232 yr by PsyCLown

How do you get 50mm in the Sunsynk battery clip terminal?

 

with effort?

1 hour ago, McGuywer said:

How do you get 50mm in the Sunsynk battery clip terminal?

 

with effort?

Cut in half length wise  No better to use 2 x 25mm cables with lugs back to back perhaps?

1 hour ago, Scorp007 said:

Cut in half length wise  No better to use 2 x 25mm cables with lugs back to back perhaps?

On the install that my father and I did with the 3 7.2 Kw Kodak Maxe's in parallel with 2 X 35mm2 cables in parallel is use 1 X 70mm2 lug on the inverter side and strip the insulation a bit longer so that both cables can go into the lug, the battery power contact for the Kodak was not able to accommodate 2 X 35mm2 lugs back to back that is why I decided to use 1 X 70mm2 lug.

The hole of the gland was a bit small to accommodate the 2 X 35mm2 cables with the insulation on so there we stripped the insulation off lengthwise of one of the sides on both cables where the cables touch on the inside and insulated the cables after inserting the cables into the gland with heat shrink from the gland up to the 70mm2 lug.

On 2023/08/15 at 12:53 PM, PsyCLown said:

Here is a picture of the black 50mm cable, their cable is from Empire Cable it seems (well, the 50mm one is at least).

The 35mm2 cable that I used is also from Empire cables and works really well and is much softer that some of the other cables that I had a look at, at some of the shops.