Have a look at the DIY Lithium thread, in particular seek out Phils post about what and where he’s ordered from. I ordered the same but just enough for one 280ah
battery, whereas Phil is building x4 like you seem to want to do.
I will probably build another now I’m happy with process and mechanics, as a single
battery no matter how big it is is a single point of failure/disaster!
we both ordered via Basen on Alibaba, they have a good track record. And Alibaba takes the payment and deals with the assurance what was ordered is delivered, otherwise they do not release the money to the supplier. The whole process whilst outwardly daunting actually was no more difficult than buying off eBay in the U.K.
what ever you do ensure you get a full DDP price, that is a delivered to your door and all import duties and taxes paid up front by them in the quoted price. If you think about duty and vat alone you’re knocking on the door of 24%, not including shipping half way around the world. So if the price says shipping is £50 for £1500 order something isn’t right,