This is unacceptable and if it was more widely known that the AC300 is quieter than the AC500 then I would never have bought it in the first place.
Reviewers saying that the AC500 is the quietest model are either shills or liars.
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Well it has a "quietest model " this mode is just not very quietest.
And of cause they are shills. Don’t you know how this works?
They send you free stuff and/or money if you talk “the right way” about it they and other start to send you more free stuff and/or money.
@Jean-pascal If you bought it from our EU website, then the contact email is right. You can provide me with the order number then I will contact the responsible department to follow up.
For the issue of the “Online request process”, we found this issue yesterday and had IT fix it, it will not happen again. Thanks for your feedback.
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Hello,
Yes ,i have buying it in europe site.
Invoice SPF-EU-34236.
Very thanks for your help because, impossible to open a case with " Online request process"
@Jean-pascal Thank you for the information. Queenie will contact you ASAP to help you to process the exchange of the AC500.
For the Online request process, I’m sorry I don’t know whether it is solved according to your description. If there is still an error report, kindly let me know. Thank you so much.
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@Jean-pascal Thank you for the information. Queenie will contact you ASAP to help you to process the exchange of the AC500.
For the Online request process, I’m sorry I don’t know whether it is solved according to your description. If there is still an error report, kindly let me know. Thank you so much.
Very thanks for your help, now Queenie Xiao, he contacted me by email and it’s perfect, we’ll be able to work on my incident. 
Many thanks for your help. 
Saturday morning ( 23/09/23) I received an email from Quennie Xiao to send me the return form.
Monday ( 25/09/23), the carrier comes to pick up the pallet.
It’s perfect, everything’s ready for return.
I’ll keep you posted.
Have a nice day, Very thanks for your help.
Thank you for your help, I’ll keep you informed until the problem is resolved.
Thank you very much
Hi Bluetti Team,
The 11 October, i have received the new AC500, normaly, i install it this afternoon.
I’ll let you know when I’ve tested it.
Best regard,
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To sum up, I received a second AC500, which reacted in the same way as the first.
Bluetti’s sales department refunded my money. As soon as you have contact with the after-sales service, they are perfect. 
In my opinion, I recommend the AC500 for use that takes into account the repetitive noise it generates with its four fans.
For home use, the AC300 is extremely quiet and only ventilates when necessary. I’ve been using it for a year now.
Pour résumer, j’ai reçu un second AC500, celui-ci réagissait de la même manière que le premier.
Le service commercial de Bluetti m’a remboursé. Dès que vous avez un contact avec le service après vente, ils sont parfait.
Mon avis, je recommande le AC500 pour une utilisation qui prend en compte le bruit répétitif qu’il génère par ses quatres ventilateurs.
Pour l’habitation, le AC300 est Extrêmement silencieux et ventile que si nécessaire, c’est celui-ci que j’utilise en ce moment et depuis un an.