Also, not that it's very important at this level of power use, but am I correct in thinking that our power meters don't care about PWM dimming ? In other words, if you run all your lights at full whack - or dim them (using PWM) - the meter will 'spin' the same and show the same chargeable consumption ?
From my testing so far, power meters do actually read less when dimming has been preformed. My test rig - Billing meter (so called smart meter) daisy chained to a non smart digital meter, then a Ferris meter (spinning disc type), Then a 4kW rated light dimmer (leading edge phase angle control type). To finally a 2.4kW oil column heater. Switched off all circuits in house except for the power point that the test rig was plugged into. Used the inverter in my van to run the oscilloscope. Power draw as indicated by all 3 meters varied steadily as light dimmer varied throughout it's range. Didn't bother taking any voltage / current or power readings. As I don't own a true RMS multimeter.
Next test will be to modify a computer power supply so I can disable and re enable the active PFC stage while it is running. This means I will have a test load that I can vary the power factor of. While maintaining the same load. Need to buy a true RMS multimeter as well.