For a 240 AC volt house, sometimes the light goes off, to prevent my modern TV (54Watt), DVD player, Playstation, Xbox from damage. Can you please recommend a good UPS. Is it just a case of adding the wattage of each device together. I have 5 rooms each room contains an air-condition, TV, games etc and each also has an air-condition. Is there such a thing as central as central UPS instead of purchasing 5 UPS for each room, is there another solution to prevent my devices from damage after outage. We have at least 5 outages a day.