Hello,
I recently purchased a Bluetti AC300 with a B500K battery module.
I am experiencing a serious issue with AC charging under unstable grid conditions.
The grid voltage in my area frequently fluctuates between 190–210V.
However, when the voltage drops to approximately 197V, the AC300 immediately stops charging, even though power is still available.
Due to frequent long power outages, I usually have very limited charging windows (only 2–3 hours at a time).
Because the voltage constantly fluctuates within this range, the station repeatedly disconnects and reconnects AC charging, making it impossible to recharge the battery reliably.
In the Bluetti app, when I try to enable Grid Self-Adaptation, the app briefly shows a loading state, but the setting remains disabled and cannot be activated.
I would like to clarify:
- Why does the device stop charging at ~197V when the grid voltage is still within 190–210V?
- Why is Grid Self-Adaptation unavailable on my device?
- Is this a firmware limitation, regional restriction, or a known software issue?
- Is there a way (or planned firmware update) to allow charging at lower AC input voltages under unstable grid conditions?
Reliable charging during short and unstable grid availability is critical for my use case, and currently the device cannot fulfill this role.
IoT: v9041.10
ARM: v4037.07
DSP: v4053.03
BMS: v1084.05
no new updates available.
Thank you for your assistance.
Best regards,
Vadym