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I always do:
batteryPackVoltage / sqrt(3) * PeakPhaseCurrent * sin(0)*sin(0) +
batteryPackVoltage / sqrt(3) * PeakPhaseCurrent * sin(120)*sin(120) +
batteryPackVoltage / sqrt(3) * PeakPhaseCurrent * sin(240)*sin(240) =
batteryPackVoltage * sqrt(3) / 2 * PeakPhaseCurrent.
Or,
batteryPackVoltage * sqrt(3/2) * RMSPhaseCurrent. Then there's that stupid cos(fi) thing to throw in too. At rated load, cos(fi) is usually around 0.80 or something for an induction motor, and it's like 0.95 or something for a permanent magnet motor. So
3 phase power = batteryPackVoltage * sqrt(3/2) * RMSPhaseCurrent * cos(fi).
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