Best practices for high current lug attachment

[P3rcival]

I'm in the middle of wiring up my home battery bank (48V, LiFePO4) and ran into a little ish here, I'm using 2/0 cable for the main connections, and I'm attaching high current lugs to connect to the bus bars and inverter terminals, I believe I've got the right lugs and heat shrink, but I want to make sure I'm not cutting corners with the crimp
What's the consensus here, hydraulic crimper a must, or can a solid hammer style crimp get the job done safely for 200A+ loads? I feel like I know stuff but I'm just doubting myself
Wanna do this the safest and cleanest way possible, so how do I go about this the best way
Thanks in advance guys

 

[Geek-Wizard]

Oh no, a hydraulic crimper is definitely a must for this. The hammer style one may be fine initially, but the lack of consistent pressure and the amount of current is too much, leading to increased heat and potential fire hazard. Don't risk it.

 

[TheBigFour87]

Oh no, a hydraulic crimper is definitely a must for this. The hammer style one may be fine initially, but the lack of consistent pressure and the amount of current is too much, leading to increased heat and potential fire hazard. Don't risk it.

I agree, a hydraulic crimper is absolutely the way to go. It applies consistent, even pressure all the way around the lug, which creates a solid, gas tight connection.
A hammer crimper, while it can work for smaller stuff, often results in a less reliable crimp that can loosen over time and create resistance, leading to heat buildup and a potential failure. The peace of mind alone is worth it.

 

[Dew762]

You should have clear heat shrink if you’re worried about it. Honestly you are the only one that can judge and ensure the hammer crimp works at all or the hydraulic. It could last ten minutes or 40 years wrong then burn down. The things I stumble upon that have lasted 25 years but looks like it shouldn’t last over two weeks is dumbfounding but overall wildly unpredictable and it’s more about what you’re comfortable with doing and paying for. There’s usually a way around it that’s falls somewhere in that “cheap, safe, and convenient” Δ and everyone and every job is gonna vary.

 

[BigGrizzly]

I'm like you... nervous about crimping 200 A connections. Based on what I dug up, hydraulic crimpers are the go-to for 2/0 and bigger cables. One guy on a DIY solar forum nailed 4/0, 3/0, 2/0 cables with a 12‑ton hydraulic tool and no drama. Might be overkill, but safer.

 

[ThepowerboX]

Agree to you all. For 200A+ loads with 2/0 cable, hydraulic crimping is non-negotiable. Hammer crimps just won't cut it because they can't compress evenly, which could lead to failures, overheating, and even fires.

Seriously, either get a hydraulic crimper or rent one, it's a must for safety. Also, be sure to use marine-grade lugs and put some dielectric grease on before crimping.

After crimping, cover the connection with heat shrink and give it a good pull. A solid 2/0 crimp should hold over 1000 lbs. If it doesn't, try again.