Sourcing large 1/4" hole lugs

[gibbygoodtunes]

Hey diy'ers I am in Atlantic Canada and looking for 2/0 crimp lugs with 1/4" holes. Tried all my local car/tractor/marine part stores and none of em have that size lug with holes smaller than 5/16" and they cant order them that small either. Anyone know where I can find these?

 

[John Frum]

Hey diy'ers I am in Atlantic Canada and looking for 2/0 crimp lugs with 1/4" holes. Tried all my local car/tractor/marine part stores and none of em have that size lug with holes smaller than 5/16" and they cant order them that small either. Anyone know where I can find these?

Try your local electrical supply.

 

[gibbygoodtunes]

Try your local electrical supply.

No go there either

 

[OffGridInTheCity]

I use Seltrem - they have a variety of lugs. Here's a 2awg + 1/4" hole listing on Amazon - https://www.amazon.com/gp/product/B0747KJ4Z6/ref=ppx_yo_dt_b_search_asin_title?th=1
Looks like they also have 2/0awg + 1/4" hole.

Plus, get close and you can drill one out to make it 1/4".

 

[Zwy]

Hey diy'ers I am in Atlantic Canada and looking for 2/0 crimp lugs with 1/4" holes. Tried all my local car/tractor/marine part stores and none of em have that size lug with holes smaller than 5/16" and they cant order them that small either. Anyone know where I can find these?

https://www.amazon.com/gp/product/B088JV5FCP/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

Used them on my auxiliary inverter mounted in the back seat area of my truck. Nice heavy lug. Be sure to click the 12% off coupon.

 

[RV10flyer]

I just bought a bunch on Amazon with #10 (same as 5mm) holes for my Seplos BMS and 1/4". Selterm with tin plating. Temco makes a nice AWG hydraulic crimper vs the odd ball sized junk made for mm.

 

[rhino]

https://baymarinesupply.com/ftz-tinned-starter-lug.html or https://baymarinesupply.com/ftz-tinned-power-lug-battery-terminal.html

 

[HRTKD]

I was going to suggest TEMCo Industrial, but they're out of stock too. It might be worth a call to their customer service line to see if they know when they'll be back in stock.

 

[gibbygoodtunes]

Alright the cheapest option looks like selterm from amazon.com but it is still going to cost me $21.28 to my door for 2 lugs... Would a piece of 1/4" x 3/4" 90degree aluminum off the battery terminal work? (Cables comming vertically off battery will help me save space) horizontal side has 6m hole for eve cell 6m terminal post and the vertical side has 5/16 hole for the smallest 2/0 lug I can source? My build is 24v with 2400w inverter with no extra dc loads. Thanks for all the responses

 

[HRTKD]

Alright the cheapest option looks like selterm from amazon.com but it is still going to cost me $21.28 to my door for 2 lugs... Would a piece of 1/4" x 3/4" 90degree aluminum off the battery terminal work? (Cables comming vertically off battery will help me save space) horizontal side has 6m hole for eve cell 6m terminal post and the vertical side has 5/16 hole for the smallest 2/0 lug I can source? My build is 24v with 2400w inverter with no extra dc loads. Thanks for all the responses

It's worth a try. With it in place, put a heavy load on the system and see if the 90° piece gets warm/hot.

 

[John Frum]

@gibbygoodtunes how much current will you be putting through the critical path?

 

[gibbygoodtunes]

@gibbygoodtunes how much current will you be putting through the critical path?

Not likely to see more than 100amps @24v. My house will only have (1) 15 amp breaker

 

[John Frum]

Not likely to see more than 100amps @24v. My house will only have (1) 15 amp breaker

Said another way, what is the maximum continous rating in ac watts for your inverter?

 

[gibbygoodtunes]

Said another way, what is the maximum continous rating in ac watts for your inverter?

2400watts

 

[John Frum]

2400watts

2400 ac watts / .85 conversion factor / 24 volts low cutoff = 117.647058824 service amps
117.647058824 service amps / .8 fuse headroom = 147.058823529 fault amps

Since you said "house" you could use thhn-2 or xhhw-2 with mechanical lugs.
By the book you could use 4 awg but I suggest you go bigger.
Building wire is usually a bit cheaper than welding cable.
I used Panduit LAMA2/0 14-20 mechanical lugs
Those fit 1/4"(6mm) studs and can accept wire up to 2/0.
I used them with xhhw-2 2 awg and my design capacity is 1500 ac watts at 24 volts nominal.
I stress tested at 1440 watts for ~6 hours and nothing on the critical path got hotter than ~28 celcius.

 

[John Frum]

Building wire is much less flexible than welding cable so the bend radius for you wires should be considered.

 

[John Frum]

https://www.digikey.ca/en/products/detail/panduit-corp/LAMA2%2F0-14-QY/2513414

 

[gibbygoodtunes]

2400 ac watts / .85 conversion factor / 24 volts low cutoff = 117.647058824 service amps
117.647058824 service amps / .8 fuse headroom = 147.058823529 fault amps

Since you said "house" you could use thhn-2 or xhhw-2 with mechanical lugs.
By the book you could use 4 awg but I suggest you go bigger.
Building wire is usually a bit cheaper than welding cable.
I used Panduit LAMA2/0 14-20 mechanical lugs
Those fit 1/4"(6mm) studs and can accept wire up to 2/0.
I used them with xhhw-2 2 awg and my design capacity is 1500 ac watts at 24 volts nominal.
I stress tested at 1440 watts for ~6 hours and nothing on the critical path got hotter than ~28 celcius.

Interesting.. thanks. I have some good 2/0 welding cable. I take it that is safe to use in the Panduit LAMA2/0 14-20 ? Or some other solid aluminum lug of that type?. That maybe something my local electrical supplier does have.

 

[John Frum]

Interesting.. thanks. I have some good 2/0 welding cable. I take it that is safe to use in the Panduit LAMA2/0 14-20 ? Or some other solid aluminum lug of that type?. That maybe something my local electrical supplier does have.

For welding cable you should use a ferrule with the mechancial lug.
You can let the lug make the crimp though.
The problem is the welding cable + the ferrule may be too big to fit a 2/0 mechanical lug.

For welding cable you should probably use compression lugs.

 

[rhino]

Alright the cheapest option looks like selterm from amazon.com but it is still going to cost me $21.28 to my door for 2 lugs..

The link I posted for the FTZ lugs was less than $12 for two 2/0 lugs with 1/4" holes including shipping.