Bluetti AC300 + B300K2 — smell of burnt rubber, like wiring

Hello @BLUETTI_CARE . Please advise. As a replacement for my Bluetti Elite 100 v2, I decided to buy a more powerful device and purchased the Bluetti AC300 + B300K2.

For the second day, there has been a chemical smell coming from the inverter fan vents, like wiring or burnt rubber.

The smell does not get stronger, but it also does not decrease. Please tell me, is this normal? Charging was done at 10 amps = 2200 watts.

Thank you in advance for your reply!