Per the SCC manual, 6AWG should fit in the SCC terminals. It might be a snug fit though.
Similarly, when I used 10AWG with 100/20 SCC, it took me a while to properly insert the cables into the terminals.
If you plan to get something like this, get the one with 4 teeth to get a square ferrules crimp. This should be able to get into the SCC terminal. I've made a mistake buying a 6-teeth one, 53EUR down the drain.
Luckily, Victron has a good cable lock system, so I didn't use ferrules at all.
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Btw, not sure if you have already bought the other cables or tools you'll need for your build yet, but here are a few tips and links.
I've spent a few hundred EUR on cables from Amazon prior, and I simply wasn't satisfied with those. At least in my experience, sourcing good cables, etc in the EU, can be quite a challenge, and an expensive process too.
Coicendetly, a seller from Amazon tried to slip me a used SCC for which I immediately requested a full refund and sent it back. Anyhow, lead by my online shopping experience thus far, I wanted to deal with the utmost professionals for purchasing the heart of my solar system, the reason why I went with the UK store. Since I'm from the EU I had to pay 30% for tax imports and customs. Well worth it in my case IMO, as these devices are a long-term investment.
This is how I've come across this store,
12voltplanet. It's where I buy all my Victron gear and cables now, but also has a variety of offerings ranging from lugs, cables, and Victron gear all the way up to fridges, and cooking hobs in one place. Though, it might be worth checking your local stores for cable lugs. I've found better ones at my local store. Though, the 90-degree found in this store is a very nice option to have.
Note: the prices seem higher than when you go to the checkout, this is due to the country-specific tax calculations. So it's best to go to the checkout to see the actual price of goods for your order.
There's also a store in the EU I haven't bought from yet, but planning to do so for the class T fuse/holder soon as I need a 125-150A range. They also have cables etc. Yet again, I haven't had the opportunity to check out the store yet,
svb24.
Few tips for the tools,
You can get away with very cheap garden pruning shears for cutting 10, 8AWG perfectly, and 6 AWG, I even used it for 4AWG cables with a bit of trial and error. It's about 8 EUR and is found in most stores. I've also recently bought a
Klein cable cutter, it's okay but will probably go for those heavy-duty cable cutter croppers used in construction next. Probably cheaper too.
Also, It's worth spending the money on an actual MC4 Crimper. Once you've crimped and assembled the MC4 connector, and connected the two cables with it, you won't be able to pull it apart by force, indicating a properly crimped connector.
This one worked as a charm for me,
MC4CrimperSet.
For cable lugs up to 50mm2/ 1/0AWG, this is a must. Period. I've bought mine locally so I can't recommend any online store or product pages.
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Anyhow, hope it helps.
Best,
D.