Q. What type and size of Generating Set do I need?
Answer:
There are many types of Generator Sets; there are single phase or three phase units, petrol, diesel, gas or electric motor driven. They can be basic manual start, automatic start or continual running units. They come in open form, weatherproof enclosed, sound attenuated, fixed, skid-mounted or trailer mounted. When sizing a Generator Set consideration should be given to the following:
Resistive loads:
Lighting and heating: The total resistive load can be calculated by adding all the installed resistive loads in kilowatts (kW).
Inductive loads:
Motors and transformers: Consideration must be given to the size, type and starting method of each electric motor.
| Rating | 240 Volt- single phase portable Generators |
| 1 kVA | Small PA systems, TV, Video and lighting to 700 Watt, small drills to 900 Watt. |
| 2-3 kVA | P.A systems, video and audio equipment, small electrical tools, kango hammer, drills, saws, lighting to 2800 Watt. |
| 6-8 kVA | Multiple use of tools as above, small bench cut-off saws, 240 Volt 140 amp welder, air compressor, Heater, Urns, Mobile fridge and 1.5 kW air conditioner. |
| Rating | 415/240 Volt- Three phase silenced diesel Generators |
| 20-25 kVA | Construction power- ablution block, site sheds, lunch room, approx 4-6 sheds subject to heating and air con appliances, 5000-6000 Watts per phase, 3 phase audio and lighting, electric motor starting up to 7.5 kW, Approx. 8 food stalls. |
| 50-100 kVA | Construction power- Approx 15-25 sheds, small office buildings, electric motor starting 15-30 kW, lighting and audio, approx 15-30 food stalls, large video screens. |
| 100-1000kVA | Construction, mining, large refrigeration, power outages, industrial and commercial power, tower cranes, back up power supply, factory units, entertainment, large motor starting. |
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