How advisable it would be to install an single voltage stabilizer in an residence based on total KVA capacity.

The total electrical load that is installed within the residential premises comprises of all the domestic appliances - Refrigerators, TVs, ACs, Music systems, Washing m/c. etc and lighting load. Most of all such installations are vulnerable to the voltage fluctuations that arise in the incoming power supply. Depending on the total electrical load calculated by taking into consideration all the installations within the residence and some additional spare capacity for new addition of load, whether it shall be advisable to install one single volatge stabilizer that shall cater to the entire installed load of the residence - also taking into consideration the cost factor involved.