# electrical question

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• #10494
ANSARI
Participant

I Have total load current 20amps in each phase i have 3phase cunnection i want to instal a generator so will u advise me what should be the capicty of generator.

#12112
Keymaster

Capacity of the generator should be greater than total peak hour powerconsumption.

#12116
عبده همد
Participant

when we connected agenerator with the network that must be the same as  with 3phase event no that is not connected with

u must connected alone and I will put attension for this information to designe it with coming later thank u

#12118
Keymaster

The capacity of generator must be the peak load current multiplied by its power factor and operating voltage then multiplied by square root of 3..The unit is watts.

#12188
Spir Georges GHALI
Participant

ANSARI said:

I Have total load current 20amps in each phase i have 3phase cunnection i want to instal a generator so will u advise me what should be the capicty of generator.

Dear Mr. ANSARI ;

to be able to calculate the Generator's power, we should know :

– Rhe Voltage's value between 2 phases.

once knowing, we apply the following formula :

S = 1.73 x U x I

where :

– S : generator's Power in ” VA “

– U : voltage between 2 phases

– I : line's current

but after calculation we should add at least 20-25 %, because the bigest effeicency for a generator done at 75-80% of his power.

Regards.

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