Created Date: November 25,2014

Created by: Tinker

If one calculates all the powers individually and adds them it does come out to 35kW.

(50+50+25) * 208 = 26kW

(25+25+25) * 120 = 9kW

Your "(V*A*Sqrt(3))/1000 " only works for a balanced circuit where A is the current in one leg, one doesn't add all three legs (your 291, though it looks like you did some rounding or have a typo 'cause 90+90+112 = 292)). Actually, if you average your three legs: (90+90+112) / 3 = 97-1/3

then plug that into your equation: 208 * 97-1/3 * sqrt(3)/1000 = 35.07kW or "close enough for government work "

I'm not sure I actually know how to directly calculate the power for three unbalanced line currents, and considering how close averaging worked out I'm not too motivated to get the textbooks out.

Created Date: November 25,2014

Created by: dieseltwitch

Trying to figure out how to calculate load on a 208/120 V Generator.

Heres my example

L1-L2 = 50A

L2-L3 = 50A

L3-L1 = 25A

L1-N = 25A

L2-N = 25A

L3-N = 25A

Given these loads here is what i get

L1 = 90A

L2 = 112A

L3 = 90A

Im also lost as to how to calculate total kVa? a calculator i downloaded (but can't see the code of) says for the above loads I have a total 35 kVA but by my math I have a total load of 291Amps and using (V*A*Sqrt(3))/1000 I get 105kVA.... so who's wrong? I feel like i have missed something and have way to much power spec'd?