It’s easy to calculate. In the above chart, the AC300 with AC on consumes 37.6 Watts. So in 1 hours it uses 37.6 Wh. In 24 hours it consumes 902.4 Wh (= 0.9 kWh) and so on.
This result is very good.
The consumption is very low for this systems. Good job 
In fact, the AC500 is the best low consumption.
This is right, also so are my oberservants.
In 3 days the B300 is empty.
And then to load it up, there is a consumption of 3500watt.
John
I have an AC300 with 2 B300 batteries. I let it run with AC out turned on but no load for 24 hours with two different watt hour meters on the AC grid input. Both meters said it used 1.6 kwh of grid power. So 1600 watthours / 24 hours = 66.7 watts idle consumption. I wish the above chart was correct, but that is not what I am experiencing.
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Do you have a graph that shows a comparison between the b300 and the b300s? Is the discharge rate significant? In my experience my AC300 with 4xB300’s discharges much faster than my AC500 with 4xB300s’s with the units turned on but the AC and DC inverters turned off. The AC300 drops about 1% per hour and the AC500 drops about 1% per 5 hours. It is a much larger difference than expected from the graph.
LAB vs. Reality
I measured the power consumption of my AC500 + 1xB300s as followed (as it is w/o load):
-
Power ON, AC & DC Off, no PV, Standard UPS Mode, No Load connected, Indoor
516W/24h → 21.5W/h (means ~200% to LAB (12.6W) and FAQ Q8 (11W) value) -
Power ON, AC ON, DC Off, no PV, Standard UPS Mode, No Load connected, Indoor
2444W/24h → 101.8W/h (means ~350 % LAB (27.4W) and FAQ Q8 (30W incl. DC) value)
I used a FRITZ!DECT 200 for measuring. In Standard UPS Mode the AC500 run the most of the time on battery (why? battery durability at hundreds of load cycles a day vs. PV usage), except during charging when the battery drops below 100%. The measurement results given from the battery are identical (AC On: 56.5V (0x5C) x 1.8A(0x5D) = 101.7W). The results in PV Priority UPS mode are identical.
@BLUETTI Is the gap between the given/promised/expected values and the real values a hardware or a software issue?
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Doesn’t your test include the wall charger inefficiency? The chart above is the AC device self-consumption.
At first glance, the two results are consistent, since you are including charger inefficiency.
I am talking about total consumption to keep the AC300 on in PV priority or UPS mode. If you are saying the chart above does not include charging losses I can see that. In real world use you have to consider the total power consumed from operation, that number still stands at 67 watt / hour.
Agreed. I’m just saying that you pointed out that Bluetti’s numbers were wrong, and I’m just mentioning that I don’t think Bluetti is wrong, since they explicitly state that this is self-consumption.
They’re not talking about UPS mode, etc.
“In real world use you have to consider the total power consumed from operation, that number still stands at 67 watt / hour.”
That’s true, if someone is using it like you are. For example, a solar input would not have the AC adaptor inefficiency 
In any case, my personal measurements validate Bluetti’s chart.
You are correct, the chart shows how much would be lost with no input from the grid, which is very good to know in a power out situation :) I didn’t read it that way until you pointed it out, thanks.
Not sure what to think about the efficiency of the DC charging side. As Wuastr pointed out above, the batteries stay in standby mode until you exceed around 150 watts solar input. Lets say that number is 137.6 to make the math easy, take away the known standby consumption from the chart, 137.6 - 37.6 = 100 watts unaccounted for.
The fan runs more when charging, I think any power conversion is going to have some overhead…
Keep in mind that the energy is not being wasted, it’s helping to heat your home :) And as someone mentioned above, if you don’t have enough solar, charge it up and shut it down until a sunny day…
I should have mentioned that we have a Blizzard warning here in Buffalo for the next 48 hours. The Bluetti is all charged up and ready to provide us with 20 hours of run time if needed. And if that’s not enough, we can charge by generator for 4 hours every day if no sun. That capability is really nice to have…
This is no hardware and software problems, but the machine is running with its own power consumption.
@BLUETTI The AC500 is the machine and FAQ Q8 says the AC500 has a power consumption of 30W when everything is ON. But in reality it needs 100W. Where are the other 70W used (wasted) for?
I have never done what you did as a test, but I can say that your findings are similar to mine in practical use. If I run a fridge the percentage used is greater than the watt hours the fridge actually uses. I find about 60-90 watts/hour is what (practically) the system will consume. Thanks for the post.
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@BLUETTI I got a new unexpected result. The machine (AC500 EU version) is running in …
- PV priority mode
- SOC 70%
- battery lever >90%
- PV 0W
- grid connected, but no supply (measurd supply <3W)
- DC and AC output ON
- output mode LOAD MATCHING
- no load connected at all
As I described, the machine consumes ~100W (53V/1.9A) from the battery (identical consumption in BYPASS C and D mode). But after disconnecting the machine from the grid, output mode is now INVERTER OUTPUT, the power consumption from the battery decreases to ~42W (53V/0.8A).
Why is the consumption in the grid connected modes so much higher? Or better, bypassing and NOT using the inverter needs more power then using it? Or again where is the difference used or wasted for?
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Just bumping this thread as I have the same observation with AC500 240V AU version. When connected to the grid the AC500 appears to use a lot more power than running disconnected for the equivalent load. My workaround for now is to use a timer and only top up from the grid once a day … but this seems crazy as this is what PV priority should be doing out-of-the box.
So same question as @MichaelSDE above… why this extra draw when grid input is energised?
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Is there any additional draw if the display control panel is left ON…time out set to NEVER?
Thanks.
Excellent 
Do you have something similar for AC200L and AC70 please?
@Derceto AC200L’s AC output no-load power consumption is 18W, and DC output no-load power consumption is 8W (for reference). The power consumption data for AC70 is being confirmed.
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The tech team has confirmed:
AC70 no-load power consumption: DC on-5W, AC on-15W.