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

@ricevs , while I agree with you about Viber, are you not doing exactly the same ?  You have not done this testing on your own but are just repeating what your friend has told you. I think you have tested Goal Zero but not evident you have tested anything else.

No one has A/Bed inverters that I know of except my friend who said the Ecoflow Pro beat the Goal Zero Yeti 3000 and both where trounced big time by the 5000 watt Giandel. That is all I know. We are in new territory here.....this is why I suggested you or someone buy both the large and small Giandel, the Bluetti and have a comparison party. You could A/B cheaper heavy AGM batteries with LifePo4 batteries, as well.

I personally would go for the Giandel because my friend (who has an $80K super revealing tweako system using super modified Apogee speakers) is the one that tested the inverters......he has great ears.....

Why don’t you become the Inverter tester for the world. .........

You can afford it. I bet you have that much on a credit card (maybe $4500 total?). Whatever you do not like, you return for a refund. I would do this.....but I have no credit/money......

What is theaudioamp man about? Do you want people to get better sound? What is your shtick? What components have you heard recently that have made your stereo sound better? Will you help us? Do you want to help us? I (and some others here) want better sound....what do you want?

@ricevs you seem to be attacking people, but from a position of weakness. Your contribution has been to report what other people hear. I reported what a Tesla Powerwall sounded like, it my house, with my system (seeing as I have one for backup and solar). I also try to help people understand how audio equipment works. In a "field" so laden with misinformation it is easy to get led astray by people who know only slightly more than the person asking or worse know less but think they know more.

What you think of as an "attack" is simply holding the mirror up to you.

You reported that you heard no difference between the powerwall and the wall AC......and you also stated that all inverters sound the same. Anotherwords, you have contributed nothing. How does what you say help anyone get better sound? I have also listened to an inverter.......I am using a Goal Zero Yeti 400 on my system right now and it improves the sound......but since my friend had a Goal Zero and then went to the better sounding Ecoflo Pro and then to the way, way, way better sounding Giandel system.....I know my Goal Zero is yesterdays paper.

What really matters is when others try the Giandel system and report back.....Nothing you or I SAY can improve the sound of someones stereo......but what I shared might certainly lead to that, if someone trys it. What do you recommend for better sounding AC? Nothing? It is all perfect?

When you say "help others to understand how audio works".......this is all in context to your belief that it is nothing but measurements are meaningful. What really matters is how something sounds. Can you help them get better sound? Or just tell them how it works.....according to your belief?

Audio, for me is not about belief......it is about BE and LIVE. You experience sound.....you experiene music......it is not about some opionion of what matters or does not matter.......the ear KNOWS.....the heart KNOWS.......the small brain just thinks it knows......but it really knows nothing of significance, if it is not open to BE and LIVE.......Do you think joy and love and peace and beauty? Yes, thoughts of these can leade to those states.......but really what you want to do is to FEEL joy and love and peace and beauty. Will you let yourself FEEL? As the saying goes......Would you rather be right.....or LOVING? You choose, every second.

I didn't state that all inverters sound the same. I said that the Powerwall with my system has no sound. If you read what I wrote, I have pointed out that inverters are effectively large switch mode power supplies and people are just blindly promoting them without any idea of the noise profile. You, based on your friend, have made a ton of conclusions and promoted the Giandel as "great" when you have no idea of the distortion spectrum, or the noise spectrum and how that will behave with the vast majority of audio electronics out there.  I have pointed out, quite correctly, that pure since wave has no technical advantage in terms of reducing the noise of audio power supplies or improving how they operate. Sine waves are simply what we must live with due to the nature of rotating machinery as our primary power generation methodology. 

You also assume that one must have user reports of a specific inverter to have any meaning. Fortunately, there are engineers that don't have to work under your limitations.