Does your house use this thing?
It is said to be able to reduce your electricity bill and save you money. All you have to do is plugging in this thing into one of your socket outlets. Some of you may ask what this thing is. There are a lot of names used to name this thing, such as power saver, electrical energy saver, power factor regulator, power capacitor, capacitor bank, just to name a few.
Is this thing really helps in reducing your monthly electricity bill? From my background knowledge, this thing (let’s call it capacitor bank) works based on the concept of power factor correction.
Power consists of 2 components, the real power and the reactive power. Real power or average power is the actual power developed and only exists at resistors. Meanwhile, reactive power is the power developed due to reactance, may it be inductive or capacitive. The ratio of real power to apparent power is what we call as power factor. Power factor also can be denoted as cos θ.
Before I continue further, let me tell you that the power meter at your home only measures real power. It does not measure reactive power. So your monthly electricity bill is based on how many unit real power your home is using. Ok, now. Power factor correction is the process of altering the power factor so that it is closer to unity (cos 0 = 1). If a capacitor bank is connected in parallel with the load (plug into socket outlet), it can subsequently improve the power factor to a value close to unity as shown in the figure below. But look carefully, after the power factor correction, only reactive power is reduced while there is no change to the real power. So, I have to say that the use of capacitor bank would not save anything on your monthly electricity bill.
However, there are still some advantages of power factor correction. By connecting the capacitor bank to your socket outlet, the electrical load on the utility company (Tenaga and SESCO) is reduced. This allows the utility company to supply the surplus power to other consumers without increasing its generating capacity. Thus, although the use of capacitor bank does not help in saving your monthly electricity cost, it actually improves the efficiency in the power usage and in a way more environmental friendly.
The Does Power Saver Really Save Your Monthly Electricity Cost? by Life Is Like That, unless otherwise expressly stated, is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 2.5 Malaysia License.