Well, not quite. The currents in each phase(leg) is ie,50A. So, 50AX120V phase 1=6KW, 50A X 120V phase2=6KW. 6KW phase 1 plus 6KW phase 2= 12KW. The voltage across phase 1 and phase 2 is 240V. So, 240V X 50A=12KW. Gensets are rated for KW output. The output is... Login to read more.