## Calculate Size of Diesel Generator

November 2, 2015 3 Comments

Calculate Size of Diesel Generator having following Electrical Load. Consider Future Expansion ratio is 10%. Average use of Equipment is 0.8 (1 is Full Time Use)

- 4 No’s of 1Ph, 230V, 80Watt CFL Bulbs, Diversity Factor is 0.8; Starting & Running P.F is 0.8.
- 2 No’s of 1Ph, 230V, 3000Watt Air Condition, Diversity Factor is 1, Starting & Running P.F is 0.8.
- 2 No’s of 1Ph, 230V, 500Watt Halogen Lights Diversity Factor is 0.8 Starting & Running P.F is 0.8.
- 1 No’s of 1Ph,230V, 10KW Motor with Y-D Starter, Diversity Factor is 0.8,Starting P.F is 0.7 & Running P.F is 0.8
- 1 No’s of 3Ph,430V, 130KW Motor with Soft Starter , Diversity Factor is 0.8,Starting P.F is 0.7 & Running P.F is 0.8

__ Calculation:__

__Calculation:__

Type of Load |
Equipment |
Starting Current |

Linear Load | General Equipment |
100% of Full Load Current |

Non-Linear Load | UPS, Inverter, Computer, Ballast | 160% of Full Load Current |

__ __

Type of Starter |
Starting Current |

DOL | 6 X Full Load Current |

Star-Delta | 4 X Full Load Current |

Auto Transformer | 3 X Full Load Current |

Soft Starter | 2 X Full Load Current |

VFD | 1.5 X Full Load Current |

__ __

__Load Calculation-1:__

__Load Calculation-1:__

- Full Load KW of CFL Bulb=(No X Watt X Diversity Factor) /1000
- Full Load KW of CFL Bulb=(4x80x0.8)/1000=0.3KW
- Full Load KVA of CFL Bulb=KW / P.F
**Full Load KVA of CFL Bulb=0.3 / 0.8=0.4KVA————(H)**- Full Load current of CFL Bulb=(No X Watt X Diversity Factor) / (Volt x P.F)
**Full Load current of CFL Bulb=(4x80x0.8) / (230×0.8) =2 Amp—-(M)**- Type of Load=Linear
- Starting KVA of CFL Bulb=1 X (KW / Starting P.F)
**Starting KVA of CFL Bulb=0.3 / 0.8=0.4KVA———————-(1)**- Starting Current=100% of Full Load Current.
**Starting Current=1 X 2= 2 Amp.————–(A)**

__Load Calculation-2:__

__Load Calculation-2:__

- Total Full Load KW of A.C=(No X Watt X Diversity Factor) /1000
- Total Full Load KW of A.C =(2x3000x0.8)/1000=4.8KW
- Total Full Load KVA of A.C =KW / P.F
**Total Full Load KVA of A.C =4.8 / 0.8=6KVA————(I)**- Total Full Load current of A.C =(No X Watt X Diversity Factor) / (Volt x P.F)
**Total Full Load current of A.C =(2x3000x0.8) / (230×0.8) =26 Amp——-(N)**- Type of Load=Non Linear
- Starting KVA of A.C=1.6 X (KW / Starting P.F)
**Starting KVA of A.C =1.6 X (4.8 / 0.8)=9.6KVA———————-(2)**- Starting Current=160% of Full Load Current.
**Starting Current=1.6 X 26= 42 Amp. ————–(B)**

__Load Calculation-3:__

__Load Calculation-3:__

- Full Load KW of Halogen Bulb=(No X Watt X Diversity Factor) /1000
- Full Load KW of Halogen Bulb=(2x500x0.8)/1000=0.8KW
- Full Load KVA of Halogen Bulb=KW / P.F
**Full Load KVA of Halogen Bulb=0.8 / 0.8=1KVA————(J)**- Full Load current of Halogen Bulb=(No X Watt X Diversity Factor) / (Volt x P.F)
**Full Load current of Halogen Bulb=(2x500x0.8) / (230×0.8) =4 Amp—-(O)**- Type of Load=Non Linear
- Starting KVA of Halogen Bulb =1.6 X (KW / Starting P.F) / Starting P.F
**Starting KVA of Halogen Bulb =1.6 X (0.8 / 0.8)=1.6KVA———————-(3)**- Starting Current=160% of Full Load Current.
**Starting Current=1.6 X 4= 7 Amp .————–(C)**

__Load Calculation-4:__

__Load Calculation-4:__

- Full Load KW of Motor=(No X Watt X Diversity Factor) /1000
- Full Load KW of Motor =(1x10000x0.8)/1000=8KW
- Full Load KVA of Motor =KW / P.F
**Full Load KVA of Motor =8 / 0.8=10KVA————(K)**- Full Load current of Motor =(No X Watt X Diversity Factor) / (Volt x P.F)
**Full Load current of Motor =(1x10000x0.8) / (230×0.8) =43 Amp—-(P)**- Type of Starter=Star-Delta
- Starting KVA of Motor =4 X (KW / Starting P.F)
**Starting KVA of Motor=4X (8 / 0.7)=45.7KVA————————(4)**- Starting Current=4 X Full Load Current
**Starting Current=4 X 11.4 = 174 Amp.————–(D)**

__Load Calculation-5:__

__Load Calculation-5:__

- Full Load KW of Motor=(No X Watt X Diversity Factor) /1000
- Full Load KW of Motor =(1x120000x0.8)/1000=96KW
- Full Load KVA of Motor =KW / P.F
**Full Load KVA of Motor =96 / 0.8=120KVA————(L)**- Full Load current of Motor =(No X Watt X Diversity Factor) / (Volt x P.F)
**Full Load current of Motor =(1x120000x0.8) / (1.732x430x0.8) =167 Amp—-(Q)**- Type of Starter=Auto Transformer
- Starting KVA of Motor =3 X (KW / Starting P.F)
**Starting KVA of Motor=3 X (96 / 0.7)=411.4KVA—————(5)**- Starting Current=3 X Full Load Current
**Starting Current=3 X 167 = 501 Amp.————–(E)**

__Total Load Calculation:__

__Total Load Calculation:__

**Total Starting KVA =**(1) + (2) +(3) + (4) + (5)**Total Starting KVA**=0.4+9.6+1.6+45.7+411.4 =**468.7 KVA****Total Starting Current =**(A) + (B) +(C) + (D) + E**Total Starting Current**=2+42+7+174+501=**725 Amp****Total Running KVA =**(H)+(I)+(J)+(K)+(L)**Total Running KVA =**4+6+1+10+120=**137KVA****Total Running Current=**(M)+(N)+(O)+(P)+(Q)**Total Running Current=**2+26+4+43+167**= 242 Amp****Size of Diesel Generator= Starting KVA X Future Expansion X Average Use of Equipments**- Size of Diesel Generator=468.7 X 1.1 X 0.8
**Size of Diesel Generator= 412 KVA**

__Summary:__

__Summary:__

**Total Starting KVA**=**468.7 KVA****Total Starting Current**=**725 Amp****Total Running KVA**=**137KVA****Total Running Current= 242 Amp****Size of Diesel Generator= 412 KVA**

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