Hi. Like to share some info about this device with you all. Not to brag, but I worked at an electronics design company for 8 years as a senior member there. I did a research on this item (such called power saver) before.

Few points to note.

1. Inside all of these boxes are just industrial non polar capacitors. You can get it at electronics shop for ~RM5 each.

2. The capacitors will indeed filter out the noise in electrical current, and thus making your total power reduced. This is because:

Total Power = Real Power + Reactive Power

The cap reduces reactive power.

3. Old TNB meters (those with spinning discs, measures TOTAL POWER), so if your house is still using that type of meter, using the caps will help to reduce your bill to a certain point. (especially if you use a lot of aircons/washing machines)

4. The NEW DIGITAL TNB meters is already designed to measure REAL POWER ONLY. So, TNB does not charge you for any reactive power that you use anymore (true for houses only, but for factories, tnb still charge for reactive power under a certain level of Power Factor).

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Secondly, I have tested a product (I will not mention brand) of such energy saver at my own house, over a period of 2 weeks, and there are basically no difference between having the device plugged in or not. (My house has the new TNB digital meter).

However, these people will still manage to make sales because,
power consumption fluctuates by a lot every month. Like for me, last month was, 170, this month is 155. So it is hard for buyers to say it doesnt work and claim back their money. lol. Also, since the price is something like RM388 or something, ppl who wanted to try paid by credit card. But the cc fee is non returnable. This is how they earn profits.

Anyway, just sharing.

You can do your math and estimate mah. If you have a 1hp a/c, try off all equipments, and see the meter run? if confirm no run then only on 1 a/c for 1 hours with lowest temperature. Sure you can get the reading from the meter.

Where you find the info of old meter using total power vs real power. Never know got such things, well maybe is a new research, definitely i have not read / hear before.