Formulae help please!cable size and volt drop

[Steve93]

Got to that time my boss wants me to ‘prove myself’. We have a job coming up and it’s a solar there’s a 40kw inverter that is 3 phase. He wants to know what cable size will it need to be and how much current per phase?

Am I right in thinking it is power/voltage? 40kw/415=96.3A? Will that be the current per phase?
Just need a kick in the right direction

 

[Andy-1960]

No, try again.

 

[Ian1981]

For amps per phase it is KW x 1000/ volts x P.F x 1.73

 

[Steve93]

40000/3=13,333a /230= 57.97a per phase?

 

[Ian1981]

40000/3=13,333a /230= 57.97a per phase?

THats one way yes.

 

[Leesparkykent]

Dont forget you ideally want a maximum of 1% volt drop for PV.

 

[Pete999]

Got to that time my boss wants me to ‘prove myself’. We have a job coming up and it’s a solar there’s a 40kw inverter that is 3 phase. He wants to know what cable size will it need to be and how much current per phase?

Am I right in thinking it is power/voltage? 40kw/415=96.3A? Will that be the current per phase?
Just need a kick in the right direction

Calculating Single- and 3-Phase Parameters - http://www.ecmweb.com/basics/calculating-single-and-3-phase-parameters