add support for 'mompow' sensor property

[lleonis]

No description provided.

[Apollon77]

Is that about momentory power? Which models use that?

[lleonis]

Yes, this is momentary power usage. I have a BRP069B45 unit in a Sensira FTXF35A / RXF35A. It reports get_sensor_info like this:
ret=OK,htemp=24.0,hhum=-,otemp=31.0,err=0,cmpfreq=0,mompow=1
Value is 1 even if AC is in standby. When it's on, mompow is usually between 5 and 15, this has to be multiplied by 100 to get the consumption in watts.

[Apollon77]

Ok, so 15 means 1,5kW ? interesting and 1 basically means 100W but in standby thats bogus?

[lleonis]

Ok, so 15 means 1,5kW ? interesting and 1 basically means 100W but in standby thats bogus?

Exactly.

After some quick research I've found a discussion here that suggests not everybody has this mompow property. Maybe it depends on some setting or hardware capability, I have no clue. Looks like en_mompow=1 needs to be indicated in get_model_info. Here is my output:

ret=OK,model=0FCE,type=N,pv=3.20,cpv=3,cpv_minor=20,mid=NA,humd=0,s_humd=0,acled=0,land=0,elec=1,temp=1,temp_rng=0,m_dtct=0,ac_dst=--,disp_dry=0,dmnd=1,en_scdltmr=1,en_frate=1,en_fdir=1,s_fdir=1,en_rtemp_a=0,en_spmode=3,en_ipw_sep=1,en_mompow=1,hmlmt_l=10.0

Also the 0.1 kW unit of measurement is mentioned here (as far as I understand Norwegian through google translate).

I have used this setup for a couple of years now. It always reports mompow=1 when pow=0. Out of curiosity I've tried now in fan-only mode which I rarely use: it is also constantly 1 even with indoor unit fans at max speed. But when the compressor is running in cooling or heating mode, mompow shows plausible values.

[Apollon77]

@lleonis Please have a look at #292 ... This completes your PR by adding tests and types and such. I also decided to expose the value as Watts. It also handles pow=0 case and sets mompow=0 in this case ... can you please have a look?