Eve 105Ah with 4 AWG cable terminal options?

[ZEUS-FL]

I have a pack or 8S2P EVE 105Ah cells. I want to connect a nice 4 AWG cables from the battery to the Inverter. Currently I am using 8 AWG wires.
My problem is the screws from that battery are very thin in order to connect a 4 AWG terminal to it.

What options do I have?

 

[sunshine_eggo]

Are they 6mm? If that's the case, a 1/4" lug works great.

https://www.amazon.com/4AWG-1-Copper-Battery-Terminal-Connectors/dp/B08R6WBGLV

 

[Rednecktek]

Are they 6mm? If that's the case, a 1/4" lug works great.

https://www.amazon.com/4AWG-1-Copper-Battery-Terminal-Connectors/dp/B08R6WBGLV

Amazon tells me I've bought quite a few of those.

 

[meetyg]

Are they 6mm? If that's the case, a 1/4" lug works great.

https://www.amazon.com/4AWG-1-Copper-Battery-Terminal-Connectors/dp/B08R6WBGLV

Isn't that a big No-No?
Connecting copper lugs to aluminum terminals? What about galvanic corrosion?

Galvanic compatibility of aluminum and copper

Galvanic compatibility of aluminum and copper

www.finishing.com

I think it's best to use tinned copper lugs instead.

 

[Rednecktek]

My brother's battery I built for his camper 4 years ago sits outside all the time in the PNW wet weather and is still fine. A little oxidization on the aluminum but nothing funky under there.

 

[meetyg]

EVE 105AH are M4 terminals, unless you have them laser welded with something else.
Personally, I use 4AWG, but I got these M4 to M6 adapters, to give a bit more traction for the nut. You can get them in various lengths, to accommodate thicker lugs:

https://www.aliexpress.com/item/1005005857899565.html

 

[meetyg]

My brother's battery I built for his camper 4 years ago sits outside all the time in the PNW wet weather and is still fine. A little oxidization on the aluminum but nothing funky under there.

Still, it's probably not best practice and could lead to problems in the future.
I wouldn't recommend it to others.

 

[ZEUS-FL]

Are they 6mm? If that's the case, a 1/4" lug works great.

https://www.amazon.com/4AWG-1-Copper-Battery-Terminal-Connectors/dp/B08R6WBGLV

When I get home i will measure but now that somebody mentioned I believe they are M4 or 3/8. I will double check. I don't know the large lugs came in that size.

 

[ScrotusGobbleBottom]

Isn't that a big No-No?
Connecting copper lugs to aluminum terminals? What about galvanic corrosion?

Galvanic compatibility of aluminum and copper

Galvanic compatibility of aluminum and copper

www.finishing.com

I think it's best to use tinned copper lugs instead.

Wow, I never even thought of this being a problem. So the flexible bus bars and lugs need some sanding and NOLOX?

 

[meetyg]

Wow, I never even thought of this being a problem. So the flexible bus bars and lugs need some sanding and NOLOX?

Most flexible bus bars I know of are tinned copper (which is OK). Do you have something different?

 

[ScrotusGobbleBottom]

I got these from 18650 battery store so I think I'm fine

 

[sunshine_eggo]

Isn't that a big No-No?
Connecting copper lugs to aluminum terminals? What about galvanic corrosion?

Galvanic compatibility of aluminum and copper

Galvanic compatibility of aluminum and copper

www.finishing.com

I think it's best to use tinned copper lugs instead.

Yep. I should have been in bed when I made that post. Tin or nickel plated copper is preferred.

As an alternative, I would also consider using NO OX ID A Special between them. It claims to prevent corrosion due to dissimilar metals.