This topic was earlier discussed thread-bare on this forum. Older threads are very informative.
Be as it may, I have a dozen spare electronic stabilizers lying around in the house apart from those installed, including double-booster and triple-booster ones. The installed ones include a 2 KV Krykard servo-stablizer for the audio system. I was fanatically buying voltage stabilizers and installing them for each and every electrical / electronic device when I shifted into a new house, as I found the voltage to be varying between 150V - 270V due to an old and faulty transformer in the area. Later I got the transformer changed by making few appeals to the Electricity Department. Now the low voltage is gone, and high voltage is occasional.
On a single occasion, high voltage (may be due to lightning) coming through the power lines destroyed a voltage stabilizer and a Belkin Gold power strip attached to that voltage stabilizer in my house. But my plasma TV was saved. Now I have totally done away with a voltage stabilizer, and connected the plasma TV through a Sollatek voltage cut-out device and a Belkin Gold power strip. This arrangement has been functional for the last two years without any problem despite few events of high voltage coming through power lines. As soon as the voltage raises beyond a limit, the voltage cut-out cuts off the power supply. The cut-out voltage is adjustable. After seeing its performance, I installed another Sollatek cut-out for the R.O. water purifier (whose motor used to burn out frequently during the nights due to high voltage), and one for the kitchen chimney (same problem here : SMPS inside would burn out due to high voltage).
In retrospect, I feel if the fluorescent tube lights in one's house are coming on in the evenings without any trouble, a simple voltage cut-out device like Sollatek would serve the purpose for most gadgets in the house. The real solution to high and low voltage events is to cut-off the power supply during such events, or to get the local transformer changed by the Electricity Department so that such events are minimized.
If you do have to run the device continuously through the high and low voltage episodes (like deep freezers, refrigerators, airconditioners etc.), or if such episodes are too common and long lasting, and your efforts with the Electricity Department to get the transformer changed are to no avail, only then you need a competent voltage stabilizer depending upon how high or how low the voltage goes. The Electricity Department is duty bound to provide you electricity with the correct voltage and rectify the voltage problems if any. In west, you can sue them if they don't.
