That is indeed a very low price.
You still need to account for shipping, assembly and installation costs but even then the price is low.
Very easy question: warranty & accountability.
I have customers complaining about the high cost of the BYD batteries I use, since they can buy batteries so much cheaper from China and other often shady outlets.
My first reply is to wish them very good luck if/when they ever need to call in warranty for whatever defect that occurs between today and 10 years from now.
Then I point them to posts like this one, where such a battery (almost) caught fire, possibly burning their house down.
The first thing your insurance company will ask for is the manufacturer’s safety, warranty, conformity and approval certificates.
For those cheap China batteries, there are none.
At best you’ll get a few years of warranty on parts, but very little to no certification at all.
The insurance company is then very likely to refuse your claim because you brought it upon yourself by using non-certified material.
And that will hurt.
Most people end up buying the professional (expensive) battery, only a minority will go “YOLO” and go for the cheap one.
A TV is a luxury appliance, I don’t know anybody who buys a TV with the intention to save money with it.
Battery is totally different use case.
Impressive amount. Even without battery or solar I don’t even consume that much from the grid so my possible savings are limited as well.
And with prices in my neck of the woods very difficult to earn that with trade mode.
I also don’t have enough solar to charge my battery cheap enough, but working on that.