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120V × 12A = 1,440W
1,240W ÷ 1,440W = 86%
240V × 12A = 2,880W
2,800W ÷ 2,880W = 97% 11% increase
2,700W ÷ 2,880W = 94% 8% increase
To me an 11% improvement sounds like an exaggeration, but still:
24kW ÷ 2,800W = 8.57h
24kW ÷ 1,240W = 19.35h
19.35h ÷ 8.57h = 225% increase of time, which is 75% short of ×3 improvement.
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