I just plugged in a single serve Keurig coffee maker and the battery went from 89% down to 74% in two minutes while it was heating using around 1440 watts. Should that be expected?
Without crunching the numbers I wouldn’t be surprised, heating elements draw a lot of power. Plus, bluettis are know for having power displays that are not the best. Keep monitoring it until you get a good feel for what it can do and for how long. eventually you will get comfortable with what it can (and cant) do.
@bluetti_haznetgmailcom The starting power of the coffee machine is relatively large, which can be 3-5 times the rated power. It is recommended that you try to load other equipment to test.
Thanks. I’ll keep an eye on the load and the wattages and discharge rates, etc., and see what the display shows. I tried a larger Keurig that has a water tank and it actually drew less wattage. I guess because the water is already warm.
But I thought this screen grab from a WaveformScience video on YouTube was interesting:
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My regular Keurig draws between 1330W and 1370W while heating up. Keeping the water hot draws 400-600W for a few seconds. It even draws 3W when it’s off. It’s a power hog for sure, but at least it’s short term.
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I also purchased an AC180. The plan was to use this as a primary power source to run a 5000 btu window unit, and use my older EB150 as a back up. The EB150 has only 1,500 cycles to 80% verses 3.500 cycles to 80% with the AC180. Both are charged by separate 400 watt systems. The AC unit runs around 60 watts continuously. I’ve found the EB150 discharges much slower than the AC180 overnight with no solar to charge them. Typically, I get around 4 hours longer between recharging with the older unit than the new one. This surprised me a lot. I’d have thought it would be far more efficient, but mine is not.
I also have an EB150 and I’m having pretty much the same experience.
Always find it disturbing when such relative large drop off SOC% occurs in a short time 
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If the displayed % is really the batteries true SOC%; then 89% - 74% = 15% . The AC180 battery capacity is 1152 Wh, then 15% X 1152 Wh / 100 = 172.8 Wh used in 2 minutes = 2 min / 60 min per hr = 0.0333 hrs.
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Then to use 172.8 Wh in 0.0333 hr, we have 172.8 Wh / 0.0333 hrs = 5184 Watts . It should not be possible for the AC180 to deliver 5184 Watts for 2 min. 
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We know that Bluetti power stations display Apparent Power VA Watts for power loads, not the Active, True Power load, Watts . But have never seen Bluetti explain what the % displayed in their power station really is, or the expected accuracy . So possibly incorrectly will assume the % Displayed is the batteries true SOC% .
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To use 120 VAC devices / appliances recommend using a Kill-A-Watt meter to measure Active, True power load Watts.
Heating water to (near) boiling point costs a boatload of energy. I can’t do the calculations but you can expect a big power consumption when heating water. I recently wanted to test my 1500VA Smart-UPS with a small coffee maker and it immediately went into overload protection.
Fortunately, I got an AC300 to stabilize my coffee addiction during a power outage.
Wonder if I should try and re-calibrate the battery meter per Recalibrate the battery meter in Bluetti solar generators - YouTube
Of course you can try calibration, but for me, a commercial power station should never need to be calibrated in that manner by the customer .