SJE Electrical Installations    
Sheffield, South Yorkshire    
Tel. 07960 419255    

 

Sheffield Electricians

SJE Electrical Installations

* Please Note: This calculator is intended for guidance only, no reliance should be placed on results


Generator Sizing Calculator:

Single-Phase 230v 50Hz
(normal UK supply voltage and frequency)

To find Kilowatts * the kVA figure by 0.8. To find current * the kVA figure by 1000 / 230

Generally for motors, generator size can be reduced if machines can be started sequentially.


Single phase induction motors are normally below 10 HP and often below 5HP, almost always machine shops have a 3-phase supply as such a 3-phase generating set would be needed for back-up of most industry motor driven equipment.

 

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5 x 100w Lighting Points     10 x 100w Lighting Points     Central Heating (Gas / Oil)  

Fridge Freezer      Electric Kettle     Television (Large Screen) Plasma/LCD  

Television (Conventional 28" Screen)        1 PC          2PC's        3PC's

Electric Oven (Plug in Type)     Electric Hob (4 Ring)      Electric Water Heater    

Vacuum Cleaner     Tumble Drier     Microwave Oven     Washing Machine    

Electric Shower     Security Alarm  

Dedicated Critical Backup

1 x Single 13A Socket       2 x Single 13A Sockets       1 x 30A Supply Point     

1 x 60A Supply Point 

Single Phase Motors 

1HP       3HP       5HP      7HP       9HP     (1 HP = 746watts)

Additional power requirements not mentioned above (not including motors)

0.5kW     1kW    1.5kW     2kW     2.5kW     4kW     6kW

Minimum Kva Generator Output Needed:    


 

 

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