What size is your Samsung? The 12 kW and 16 kW Samsung (and also the 8 kW I believe) use the same compressor and are software limited, so 800 W sounds right unless you have a 5 kW model. It also depends on whether you are taking your reading from an independent meter or the Samsung display as the latter is calculated differently and not that accurate.
Most compressors have a minimum operating speed to ensure they stay out of a condition called surge (instability caused by incipient reverse flow, which can cause mechanical damage). My own measurements indicate that the motor inverter on the Samsung HTQ 8kW compressor can run as low as 20Hz, and if this is still too high to meet process requirements the controller stops the compressor.
Compressor theory suggests that the power drawn by the compressor at any running speed depends on the throughput (in our case the R32 circulation rate, which is a function of the heat demand by the circulating water to the emitters) and the head, which depends on the inlet pressure (which is a function of ambient temperature) and discharge pressure (which is a function of the LWT).
So the minimum power drawn is not a fixed number, depending as it does on the above factors, but it seems to me that there’s not a lot you can do about it - it is whatever it is at the 20Hz lower inverter limit.
(In the HTQ series - which don’t seem to have a Samsung Gen number - all three models 8/12/14kW have the same compressor, so I’d expect the 12/14kW inverters to have the 20Hz lower inverter limit too.)
In response to @MikeJH’s comment about the Samsung remote display, he is quite right in that this is the total power to the Outdoor Unit - including the fan (on ASHPs) or the circulating pump (on GSHPs) and the electronics, as well as the compressor. The fan in particular is quite a large power consumer (100W or more at full speed) so can be quite a significant portion of the number shown on the remote display. If you have a power meter just on the compressor power supply you can expect to see a quite different number.
The foregoing is fairly consistent with what Samsung told me when I asked about compressor turndown - they said “about 4kW output for the 8kW unit” (i.e. about half of nameplate - not far off 20Hz compared with a nominal 50Hz full speed), and I certainly see my compressor stop when the heat duty falls below ~3.8kW.
If you can get it stable at 800w that looks pretty good. My gen 7 8kw cuts out at anything between 2500w and 1100w. The internal flow meter seems wildly inaccurate as I get 27.3lper min at 80%pwm while openenergy is 17.85lpermin, also Samsung advise that “2.07kw is the minimum turndown on your unit”
Not sure it helps but seems a degree of randomness in there somehow.
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