Charging time on Bluetti Premium 30 v2

I’m experiencing what looks like incorrect BMS behavior on a BLUETTI Premium 30 V2 and wanted to check if others have seen similar issues.

1. Charging time always shows 99.9h (on device screen)

No matter the input power (100W, 200W, 300W), the station display always shows 99.9 hours to full charge.

However, the mobile app shows correct charging time.

2. Incorrect power draw and runtime at low loads

At low loads (8–30W, e.g. laptop via AC), the station significantly underreports power usage and overestimates runtime.

Example:

  • Device shows ~16W load
  • Estimated runtime ~9 hours→ This equals ~158Wh, while the unit is rated ~320Wh


Both the device and the app show the same incorrect values.

At higher loads (130–150W, e.g. TV), runtime estimation (~2.5h) matches expected capacity.

Cross-check:

The same laptop connected to another power station shows ~34W consumption.

If we use that value, 9h runtime matches ~320Wh — meaning the issue is likely incorrect load measurement, not battery capacity.

3. Troubleshooting already done

  • Firmware updated to latest version
  • BMS calibration performed twice (full charge → full discharge → full charge, no load)


Issue persists.

This strongly suggests incorrect power measurement by BMS at low loads.

Has anyone encountered similar behavior on BLUETTI devices?

@AndreyTavrel , Have a read on this thread.
https://community.bluettipower.com/t/elite-10-discharge-too-quickly/42300
The power station’s self consumption when using low loads can often be higher than the actual load. (This is not displayed). The display you see on the App or Unit is the power being provided to the device and is slightly more than what it draws, this is a part of the efficiency factor. This is also affected by turning on both DC and AC load buttons, even without anything plugged in. Here both DC and AC loads will display zero, but there are background loads just for the power station to be switched on, i.e. bluetooth, wifi, inverter and the display itself.

All this in general making sense… unless we will come to real figures, if 17W load will cause 9.4 hours of powering, that means I have 159.6 Wh available capacity, and all internal consumption takes all other capacity from 320Wh available? So, internal components consume 50% of energy? Is that normal efficiency? Why same laptop connected in the same minute to another power station from Allpowers (also not perfect), by the AC inverter as well shows 36W and 8 hours which is equal to it’s 288Wh capacity? I do have another Power station from BigBlue, CellPowa 1000, it is always shows correct consumption and remained time (means it calculates right capacity). So, I still thinking it is incorrect BMS behavior… and we are ignoring first issue - 99.9 Hour charging time always.

And even more… Let’s exclude AC inverter, and keep it on DC only - so 12 Volts (or 24 via StarGear adapter) output to Starlink mini

With consumption 21W - remained time 10.7 Hours on 97% capacity. So, what is the battery capacity we have: 21Wx10.7 hours = 224.7 Wh, even with 97% of capacity from advertised 320 = 310 Wh must be available.
So, I what conditions I can get 320 Wh from this device?