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.
They are overpriced. So yeah, either build your own or find sales with steep discounts.
We did precisely this with some Ecoflow units. We got their smart power panel and I lined it off of the sub panel for our generator. Basically runs heater, water pump, fridge, freezer, network and home automation as well as a few lights in each room. We installed this at a secondary property (lake house) that is a few hours drive. This way if it loses power it’s ok for a few days and we don’t need to head up immediately. We have a generator that we can run when we get there, but a side benefit of using these units is that we can also pull one and charge it at a car charging station. It is also expandable as you mentioned. Our current config will probably get us 2-3 days in winter. In summer, this is probably one to two weeks.