My awful experience with Bluetti
I had a very bad experience with Bluetti and wasted £1200 on their AC200 MAX, I do not recommend their products if you need a reliable power source - after firmware update it was not possible to turn on/off DC or AC from the unit via buttons, only via the mobile app. I submitted support request incl. all the details, moder, SN, detailed description and after several days I got a response asking... what model is it? I replied right away, and some days later they told me they will push firmware update and to check the unit. Over the next week I kept checking and nothing - no update, no fix. I contacted them again, and the reply comes sometimes after a week! A reply that said: we will push the firmware again. It kept going like this for a month without any proactive work from Bluetti, just vague and super slow responses. I was then told it has to be repaired, I submitted the invoice, then I was told I have to go to retailer as they do not provide warranty if it was not purchased with them. But Amazon told me to contact Bluetti. It's beyond shady what Bluetti is doing but I then saw the 1-2 star ratings on TrustPilot and Google for Bluetti UK, US, DE.
THINK HARD BEFORE BYING BLUETTI. There are more reputable manufacturers.
TLDR: Bluetti took 1 month of very slow and vague email responses and failed to address or explain the problem and then told me I have no warranty even though it's within warranty period and that I should contact the seller (a major retailer). The seller told me to contact Bluetti! Bluetti just washes their hands. Absolute horrid experience and waste of money. Buy any other brand but Bluetti.