I just received a new AC200max and I’m already thinking of returning the device.
Unfortunately the control display shows constantly wrong watt when using AC output. I used a separate measurement unit to compare values. With real power of 10w, the display of the AC shows 100w. with real power of 150w, the AC shows 230w.
This is annoying if you want to estimate remaining usage time. I would accept +/-10-15% deviation, but 90w is unacceptable (at least in my opinion).
is this a known error, or is this a defect specifically with my AC200max?
is there a way to re-calibrate the device?
is there a chance that this will improve after a few load cycles
Basically the watt meter is not very accurate at low wattage. Below 50W it often reads zero and @BLUETTI has stated in other places that it does not work reliably below 50W.
Also, when you measure with your watt meter (assuming it is accurate) there is an additional draw from the AC200MAX since it has to take the DC power in the battery and convert it to AC. There is some loss that happens here.
Finally, you cannot consume 980W … Watt is a measure of instantaneous power usage. Consumption is power over time, measured in watt-hour(wH) or kilowatt-hour(kWh).
You should, theoretically get about 85% of the rates capacity taking into account the loss discussed above, so the AC200MAX has a 2kWh capacity, so you should be able to draw about 1700kWh out of it before it reaches zero. Remember that when you are not drawing power and the device is still on, you are still drawing power to keep the screen and the bluetooth, etc, on.
I have a fridge that draws ~1.7kWh per day and with a AC200MAX and no extra B230 batteries I can get about 24 hours with no solar input.
Thanks a lot for the input and clarification. To clarify, of course I wanted to say 980wh as accumulated capacity running from 100% to 0%. In the other direction, the same meter accumulated 2100wh to load from 0% to 100%.
This would mean that I only was able to get approx 50% of the theoretical capacity.
I used it to run multple PCs (iMAc, Windows and a Notebook with Montitor), adding up to approx 120w in total (measured by the separate meter) . As the AC200max was showing around 200w for this load, it seems like that the AC conversion consumes additional 50-80w. Taking the overall loss into account, I can imagine, that with 100w constant AC load, you have to add additional 70-90w waist. This would explain why only approx 50% of theoretical capacity can be used.
For me the only question would be, is this by design and acceptable or is this poor performance a bug with my specific AC200max which needs to be corrected.
Hi @rj2000 , please provide your AC200MAX SN code and are you using US 120V?
After we get your SN code, we will first have our engineers push you a firmware update. You update and reboot, then load other devices and try again
I run home office equipment via the AC200max. Mulitple PCs (iMac, Windows and a Notebook with Montitor), adding up to approx 120w in total (measured by the separate meter) . The AC200max is showing around 190w for this load. So it seems like that the AC conversion consumes additional 70w.
Is this within expected range for this device?
It seems that the AC200 max AC output reading is in VA (volt-amps), not watts. If you put a resistive load like a heater or hair dryer on it should read pretty accurately. If the devices you are feeding have a low power factor the consumption will appear higher on the Bluetti screen. Feeding the small loads you mentioned continuously will be very inefficient. I have found the self consumption to be just under 70 watts during 24 hour (watt in - watt out) tests with small loads. Neither my AC300 or 200 max read ac loads below 50 watts consistently, but they are pretty good above that, but again, the reading is in VA, not watts.