To me it looks like a much cheaper option if you compare it to something like a Tesla Powerwall or an LG Chem battery, with the added benefit of also having power expandability if you need to increase the storage at any point (again, at a cheaper price point). I saw this Bluetti AC300+B300 on sale for $1200 less, so I was wondering what do you guys think about the idea.
It is much cheaper because you are getting a fraction of the capacity. The one you linked has 3 kWh of capacity. The power wall has 13.5.
The power wall also has a 6 kW inverter instead of 3 (and I seriously doubt it will output 3 continuously without overheating).
Plus you are not connecting these things to your home breaker panel like the powerwall does.
I’m not a Tesla fan, but you have to compare apples-to-apples.