Using battery power to go off the City's power grid

This thread moved me to buy the bluetti ac200max so I want to share my experience with the Bluetti.  

I have two audio setups and one of them is using the klipschorns. Because they are very sensitive I could hear the hissing noise coming out of them just as I turn on the amp ...but not each time...mostly on daytime, I discovered. After some reading I bought the EMI meter to check the interference on the wall AC. This small device does two things: expresses the noise in number (mV) and magnifies it through the built-in speaker. (Different one than used in this thread). In daytime my interference was around 1400mV and in the evening around 100mV especially when the airconditioning and some light dimmers are turn off. 
So I ended up listening my music in the dark :) ... only in the evening because it sounded totally different then during the daytime.  The sound came from a very black background with better bass and no fatigue on the highs...and almost no hissing from the klipschorns when the amp turns on. Wow. So I understood I had AC problem and I wanted a solution for daytime listening too.

I came across this thread and bought the bluetti ac200max immediately. I liked that better then other ac filtering solutions. 

This is the case when I plug the EMI measuring device into the bluetti:
- the interference measured in mV is sky high: more 1500vM 😬 
- But the build-in speaker is very quiet 😯 🤔?!! Actually it produces very high pitched noise that is much and much less audible because of its height I think. First time I see the numbers don't match the noise from this little speaker on the EMI meter.

What does that to the sound quality? 
With bluetti it is definitely better then the wall socket when using it on daytime. But it's very difficult to say if that is the case when comparing it to nighttime listening when the interference on the line is very low. I just did 10 times A/B comparison with and without bluetti. Score on the grid line was 140mV. This is where my setup comes alive. Maybe it is even better then with the bluetti. But the difference is very small. But I don't have to pull a lot of devices from the socket and be sitting in dark :) So i think it's a keeper. 

Ps I'm using it in Europe. 220 volts. 60hz. 

I've personally doubled down on battery/inverter power. I just bought a Shunyata Venom V16 power conditioner and a Giandel 2000W pure sine wave inverter.  All of my digital components will go to this new inverter/conditioner and the analog components will stay withe the Giandel 5000W inverter with the Shunyata Denali V2.  The idea here is to keep all of the dirty digital garbage on its own "dedicated line" and away from the analog components like the amps.  I plan to stay with one battery to power both inverters.  I'm not going to back to wall outlets any time soon. I know too much. 

@zagortenej I think the older Bluetti’s might measure better. Look into the Bluetti EB150 or EB240, imho. You might be surprised how clean it sounds.

Does the combination of the Giandell 5000w inverter with the Bluetti B300 sound feasible?

I think that's a question for Bluetti.