We have a lot of power line problems in our area, including brownouts (not the same as blackouts) and voltage spikes. I guess that's the problem living in an industrial area. The voltage range required by this particular A/C is between 220-230V. The nominal voltage in our area is 230V during the day and around 240-245V in the evening (when most industrial machines in our area are turned off).
Anyway, I bought a used 2kW Line Conditioner (aka AVR) for my Panasonic Inverter A/C. Inverter type A/Cs have a lot more electronics in them than traditional ones, almost comparable to a small desktop PC.... and it costs nearly as much. I plan to keep the A/C for at least 10 years, so I hope this little investment goes a long way in air conditioner years. I use a good UPS for my PC, why should my A/C get any less protection? :D