Invertor motor only save electricity if there are frequent stop-start operation. So unless you have the habit of opening the door of your fridge often, I doubt there is much saving.

Care to show me how you come to that conclusion?

I would think Invertor air cond would have the biggest saving, assuming you don't put it in an over-sized room.

Take car as an analogue. In situation whereby there are lots of stop-start (as in town driving), it uses more fuel. On highway with very few speed variation and no stop-start, it uses less fuel. Invertor works on similar principle.

Take the case of non-Invertor fridge. If coldness has been achieved, normal motor has to stop completely. And when temperature rises, the motor has to restart from scratch.

Now with Invertor fridge. When coldness has been achieved, the motor doesn't stop, it merely slows down. When temperature rises, the motor doesn't has to restart from scratch but merely speeds up.

Invertor works on DC current. So AC current has to be converted to DC current and there is a power lost of 10% when doing so. So in situation whereby the motor has to be continuously running, then Invertor motor actually uses more power. For example. Putting a tiny air conditioner in a huge room.

That's how I understand it.

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Added on December 4, 2011, 7:55 amThis just proves what I said. In a properly sized room with an appropriately sized air cond, Invertor air cond can save a lot of money. Imagine, if your bill is RM200 a month, it translate to a saving of RM80. I don't think you can save RM80 off your electricity bill with Invertor fridge.

But if you put a small 1HP Invertor Air cond in a big community hall, your saving is nil or even higher by 10%

This post has been edited by Optiplex330: Dec 4 2011, 07:58 AM

Inverter Air conditioner has to convert the AC to DC first before use. In doing so, loss of power is approximately 10%. So if the motor has to work full power without stopping (like tiny air cond in huge room), an Invertor air conditioner actually uses more power than non-Invertor air conditioner.

Quote

"Inverter" air conditioners use a variable-frequency drive to control the speed of the motor and thus the compressor. The variable-frequency drive uses a rectifier to convert the incoming AC current to DC and then uses pulse-width modulation of the DC current within an inverter to produce AC current of a desired frequency."

"Conversion energy losses from AC to DC and then back to AC can be as high as 4 - 6% for each conversion step."

http://en.wikipedia.org/wiki/Inverter_%28air_conditioning%29

This post has been edited by Optiplex330: Dec 4 2011, 08:57 AM

Fridge with Electrolux label and people automatically think it is good. But with Haier label, people automatically ask around "is it OK?" Good doesn't even come to mind.

No idea about fridge.

But if you know how to use them, Inverter air conditioner really will save you 40% in actual experience.

Go to air cond thread. Explain there already

https://forum.lowyat.net/topic/3061458/+380


BTW, I find it hard to find power consumption of fridge sold in Malaysia. It's easy for air cond but not fridge.



This post has been edited by Optiplex330: Feb 17 2014, 04:52 PM

I know inverter air cond can cut electricity by 40% if you know how to use them. What about inverter fridge?

Let's say a 700 liter fridge. How much in approx Ringgit term can be expect from inverter fridge?

For example, I think for a 13,000 BTU air cond for night use, it will reduce bill from RM100 to RM60.

I have a 700 liter and it says 1.2Amp. Or was it 600? Couldn't remember


This post has been edited by Optiplex330: Feb 18 2014, 11:37 AM

No idea. Brand new Hitachi. The biggest I can find.

You sure about that?

Does these modern inverter fridge comes with auto-defrost? I mean, after certain days or weeks of operation, the fridge automatically go into defrost and then restart cooling process?

I think they do but not sure.