Best crimping tool for MC4 and battery terminals?

Right, so I've got a Victron setup in the motorhome that's finally behaving itself, but my dodgy crimping tool situation is making me look like I've got parkinsons every time I need to do terminals.

Currently using some cheap Amazon special that cost about a fiver, and I'm genuinely concerned it's going to either:
a) Snap mid-crimp leaving me stranded in the Cotswolds
b) Create a dodgy connection that slowly burns the van down

Got MC4 connectors on the solar panels and some chunky battery terminals on my lithium bank that need proper attention. The spreadsheeted calculations all look lovely until one crimped connection decides to go rogue, yeah?

So the actual question: Is there a tool that doesn't cost more than the battery system itself but actually does the job properly? I've heard Weidmüller mentioned, and someone on a Fogstar Facebook group swore by a specific Renogy set, but I want recommendations from people who've actually used them without melting stuff.

Also worth knowing — I'm not doing this professionally (thank god), just need something that'll last through a few years of occasional maintenance without becoming a paperweight.

What's everyone actually using that doesn't make them want to throw tools at the campsite?

MC4s are finicky buggers. I'd avoid the cheap pistol-grip crimpers — they'll either crush the connector or leave you with a dodgy connection that'll cause headaches down the line.

Went with a Knipex 97 61 190A for mine and it's been rock solid. Proper mechanical advantage, decent feel for when you've got the right squeeze. Cost a bit more but worth it for peace of mind, especially with Victron gear where you want solid connections.

For battery terminals themselves, I use a Weidmüller crimper — sounds posh but it's genuinely foolproof. The ratchet mechanism won't release until you've got proper compression, takes the guesswork out.

Honestly though, if you're doing this regularly, consider getting a proper press. Seen a few van converters sharing one locally — might be worth asking around your area?

What's your budget looking like? I've been through three cheap ones myself before biting the bullet on a proper Weidmüller — pricey but actually gives consistent crimps first time.

The thing that caught me out was thinking MC4s and battery terminals need the same tool. They don't, really. For the MC4s you want something with a defined stop, otherwise you're guessing at the squeeze pressure. For battery terminals (guessing you're talking 6mm² or larger?) a dedicated hexagonal crimper is miles better than any pistol-grip.

Are you doing this regularly or just occasional terminal work? If it's just every few months, honestly might be worth getting a local sparky to do it — saves the frustration and you know it's done properly. On a narrowboat or motorhome you can't afford dodgy connections vibrating loose.

Been down this rabbit hole myself with the static caravan setup. The cheap crimpers are genuinely a false economy — I binned two before realising I was just making dodgy connections that'd cause grief later.

Worth asking: are you doing mostly MC4s or mixing in battery lugs as well? Makes a difference in what you'd want.

I ended up going with a Weidmüller for the MC4s (about £40-50 if you catch them on offer) and a separate ratchet crimper from Renogy for the battery terminals. Not ideal carrying both, but honestly the ratchet mechanism on battery lugs is non-negotiable — you get consistent compression and it won't let you close until the crimp's actually done properly.

@BurnWalker's right that proper tooling saves hassle long-term. Could also look at pre-crimped MC4s if you're not doing loads of installations — takes that variable out entirely.

What gauge cable are you typically working with? That'd narrow down whether you need something beefy or if a mid-range option would do the job.

Been there mate. Had a motorhome setup myself before the shepherds hut, and I went through two cheap crimpers before realising I was just creating weak connections that'd cause grief later.

The thing is, MC4s need consistent pressure or you're basically gambling. I ended up with a Weidmüller PZ 6 and it's been solid for three years now — proper ratcheting mechanism so you can't under-crimp. Costs a bit more but the connectors seat properly every time.

For battery terminals though, that's different territory. I use a separate Greenlee crimper for the heavier gauge stuff on the Victron batteries. The two-handed squeeze gives you better control than a pistol grip, especially when you're working in the confined space of a boat or hut where precision matters.

Only other thing worth saying: get yourself some ferrules if you're not using them already. Bare stranded wire into a terminal block is asking for corrosion trouble down the line, and it changes how the crimp actually seats.

What gauge are you mostly working with?

I've been there with the shaky crimps — honestly, it's worth investing properly. I went through two wonky Harbor Freight specials before realising I was just creating future problems.

Ended up with a Knipex crimper for my MC4s and it's been solid. Not cheap, but the leverage and consistency mean I'm not sat there squeezing like I'm arm-wrestling the thing. For the heavier battery terminals on my leisure batteries, I use a Weidmüller — bit more specialist but the repeatability is worth it when you're dealing with thick gauge cables.

The trick I've learned: don't cheap out on something that's literally connecting your entire system together. A dodgy crimp can cause voltage drop, corrosion, or worse—I've seen it cause intermittent faults that take weeks to track down in a motorhome setup where you're mobile.

Worth mentioning—get yourself some proper wire strippers too while you're at it. Damaged wire insulation round a crimp joint is asking for trouble, especially in the damp caravan environment.

What gauge cables are you mainly working

The shaking is usually poor jaw alignment rather than tool quality — check your crimper isn't bent. That said, for MC4 and battery terminals, you really need a proper ratcheting crimper (Weidmüller or Knipex). Cheap tools won't hold consistent pressure. If you're doing this regularly on a narrowboat or caravan, spend £80-120 properly — saves you replacing corroded connections later.