This depends on what equipment or devices that you need power for. Please make sure to check the wattage required to run each item.
Listed below are examples of "typical" loadings for items plugged into socket outlets:
500-watt sockets: PC computers, TV’s, video’s, spotlights to 500W, refrigerators
1000-watt sockets: domestic filter coffee machines, lighting up to 1000W
2000-watt sockets: kettles**, machinery up to 2000W
3000-watt sockets: hired coffee machines, machinery 2000W to 3000W
Note ** - these appliances are of varying power requirements dependent upon type or manufacturer. It is therefore essential that the reference tag or plate that is fitted to each appliance under law be read, the loading in watts or kW (kilo Watts = Watts x 1000) will be stated, and the appropriate size socket ordered.