Generators & Welding

NB 1: Amps x Volts = Watts.
To estimate the generator capacity needed, apply the following formulae:

In a 1 phase installation:
1 kw = 1.25 kva; 1 kva = 4 amps (10 kw = 12.5 kva = 50 amps)
Kva x 4 = maximum amps @ 230 v in a single phase installation

In a 3 phase installation:
1 kw = 1.25 kva (10 kw = 12.5 kva = 18-20 amps)
Kva x 1.5 = maximum amps @ 400 v in a 3 phase installation

NB 2: Most permanent generator installations for domestic use are between 2.5 kw – 20 kw on a single phase (230 volts AC 50hz)

 
                               Starting up               Running
   Light bulb                       60 w                   60 w   
   Refrigeration             1 000 w                 350 w   
   Freezer                     1 000 w                 350 w   
   Kettle                        1 500 w              1 500 w   
   Stove plate               1 500 w              1 500 w   
   Microwave oven          900 w                 650 w   
   TV                               200 w                 200 w   
   Decoder                        60 w                   60 w   
   PC + Monitor               700 w                 700 w   
   Printer                          500 w                 500 w   
   Fax                               600 w                 600 w   
   Geyser                      3 000 w              3 000 w   
   Fan                              150 w                  150 w   
   NB: Recommended not to exceed 70% of generator capacity
 
Indication of size generator required:
 3 - 5 kw: Suitable for Private Individuals, Households, Small business enterprises
 10 - 50 kw: Suitable for concerns such as Merchants; Manufacturers; Essential and Financial Service Providers, Light Industrial
 60 – 100 kw: Suitable for Butcheries, Guest Houses, Ice Cream Factories, Farms, etc
 150 – 300 kw: Suitable for Lager Supermarkets, Laboratories, Clinics, Lodges, Larger Factories, Banks, Residential Complexes etc 
300+ kw: Suitable for Large Projects, Facilities and Institutions like Hospitals, Jails, Large Shopping Centres, etc – can even supply power for an entire town

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