Hidden consumption washing machine

[Macro]

A beautiful sportsman like you must send us at least 200w to the pedal.... It will still make you pedal 2h30 a day...

If we add in the equation the energy efficiency of the human body of 25% .... you will need an energy intake of 2 kcal to get there ... or 478 grams of sugars, or 620 g of coconut oil. sunflower...

[Christophe]

Oil is not good, I prefer ethanol!!!

The muscle output is well at 25% but this drops to 6% taking into account the digestive output...

[Leo Maximus]

Here is what the watch of the washing machine gives to the oscillator. A little triangular, a little sinusoidal...:

Washing machine standby

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With 0,1 V/div I have between 0,3 and 0,4 volts peak to peak, which is between 0,11 and 0,14 volts rms (or "RMS", it's better ) across a 10 ohm resistor in series.

A priori, with the oscilloscope, the standby current (11 to 14 mA) would therefore be much lower than that measured with the RMS voltmeter (58 mA). The mains voltage fluctuated between 231 and 233 volts.

It remains to be seen what the Linky counter measures and counts. Does it round everything up to the next amp?

Anyway, it's more than 5 mA for the washing machine, so I cut .

[izentrop]

if it is the Chinese mechanical programmer eats more current than the day before the machine

It's very weak, like the engine of a clock, not even measurable.

I checked if my Chinese energy meter was able to make a correct measurement in watts (rms) in capacitive power, with a capacitor of 0.7 µF (0.47 + 0.22) in series with a resistor of 3400 Ω

Per measurement: 1 W
By calculation: 55,6 VX 55.6 / 3400 = 0,9 W (voltage across the resistor)

By making other measurements with resistors alone, the power meter is rather generous for low values. Its measurements are quite correct, whatever the power factor.

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So I checked the standby consumption of the washing machine: measurement within the standards, no need to put a switch.

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A priori, with the oscilloscope, the standby current (11 to 14 mA) would therefore be much lower than that measured with the RMS voltmeter (58 mA).

To obtain the true measurement, it would be necessary to see the phase shift with the voltage to take account of the power factor.

[Petrus]

I did a test of different power meter sockets to see which was the most sensitive:
laboratory-econological/test-of-the-minimum-power-measurable-by-different-sockets-wattmeters-t17355.html

[Flytox]

- To assess the "usefulness" of turning off your computer when it is no longer in use, you can also calculate when the price of your "useless" electrical consumption exceeds the renewal price of the said PC (for a less greedy model). These machines have become quite reliable and withstand years of daily starts. In the stats of one of my Hard Drives it showed over 6000 starts last year...It's still running.

- Another quite different example, at work we had a PC that ran under NT and on an inverter to monitor a fleet of machines 24 hours a day, 365 days a year.
In 14 years, it has had no breakdowns!!! It stopped only 2 times about 30 minutes (inverter failure). It consumed with its screen between 300 and 400W. The price of the computer becomes negligible compared to the price of its electrical consumption. It was stopped for obsolescence and not for failure.

- In fact, the real criterion is perhaps that it consumes as little as possible in all circumstances and not to look at its rather good reliability.

[Leo Maximus]

A priori, with the oscilloscope, the standby current (11 to 14 mA) would therefore be much lower than that measured with the RMS voltmeter (58 mA).

To obtain the true measurement, it would be necessary to see the phase shift with the voltage to take account of the power factor.

Very good, but how to measure?

My current clamp will probably introduce phase rotations and that would distort the measurement and I would have to open it. In addition it is not very sensitive and I would probably have background noise which will also distort the measurement.

To display the current on the oscillo it is necessary a connection in series. Even if the power cord is not grounded there is a risk for the oscillating knowing that it is a measurement on the sector.

In short, the result may be random...

[izentrop]

You need what you need to make precise measurements at low power with a dual-channel oscilloscope: https://www.chauvin-arnoux.com/sites/de ... ce_ed1.pdf

[Obamot]

As a result, all electrical devices with a touch screen have a technical watch that constantly tests the circuit, to see if a contact event occurs...

And this, instead of having a simple push button on / off on the front: shame!

[dede2002]

Hello,

Out of curiosity I measured washing machine and dishwasher, with a PM231.

The washing machine off consumes "only" 1.3 W, with a power factor of 0.13!
Intensity displayed 0.04 A, by calculation it is 42 mA...

The dishwasher off consumes 0.4 W, with a power factor of 1.
Intensity displayed 0.00 A, by calculation it is 1.7 mA.

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